ISO 21308-2:2020

INTERNATIONAL ISO
STANDARD 21308-2
Second edition
2020-09
Road vehicles — Product data
exchange between chassis and
bodywork manufacturers (BEP) —
Part 2:
Dimensional bodywork exchange
parameters
Véhicules routiers — Échange de données de produit entre les
fabricants de châssis et de carrosseries (BEP) —
Partie 2: Paramètres dimensionnels d'échange de carrosserie
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Coding principles . 2
4.1 BEP codes of truck chassis and bodywork . 2
4.2 Units of BEP code values . 4
4.3 Numbering . 4
4.3.1 General. 4
4.3.2 Numbering and type designation of frame-mounted objects . 4
4.4 Code assignment and description . 5
4.5 Priority . 5
4.6 Loading condition . 5
4.7 Presented in . 5
4.8 Related XML coding . 5
5 General dimensions. 6
6 Chassis related dimensions .10
6.1 Axle and wheel related dimensions .10
6.2 Chassis frame related dimensions.24
6.3 Cab related dimensions .48
7 Bodywork related dimensions .51
7.1 Sub-frame related dimensions .51
7.2 Bodywork dimensions .58
Annex A (informative) Corresponding codes in related ISO standards .63
Annex B (normative) XML coding related to this document .66
Bibliography .85
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 40,
Specific aspects for light and heavy commercial vehicles, busses and trailers.
This second edition cancels and replaces the first edition (ISO 21308-2:2006), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— addition of several new codes based on the experiences from the first edition;
— addition of Annex B showing specific XML coding for this part.
A list of all parts in the ISO 21308 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

Introduction
Truck chassis manufacturers deal with configurations of chassis in infinite numbers of possible
combinations, and bodywork manufacturers produce highly customized superstructures on these chassis.
Bodywork manufacturers build their superstructures on chassis of several different truck brands.
The production efficiency of a specific truck chassis and its body combinations can be greatly improved
by achieving the correct technical and commercial information about the specific chassis communicated
with the bodywork manufacturer in advance. The information must be reliable and give the bodywork
manufacturer confidence to prefabricate the body or the superstructure before the chassis is delivered.
With uniform conditions, unambiguous dimensions and supplementary information can be established,
transferred and correctly interpreted by the receiver. Increased information efficiency will improve
the quality and reduce the lead times.
The ISO 21308 series specifies a generic system of codes for exchanging specific data between truck
chassis manufacturers and bodywork manufacturers, providing a platform for efficient communication
between the parties. It applies to commercial vehicles as defined in ISO 3833, having a maximum gross
vehicle mass above 3 500 kg.
Exchanging codes in accordance with the ISO 21308 series is useful in various situations, for example,
for design and manufacturing, technical specifications, technical drawings and leaflets.
The codes can be communicated via, for example spreadsheet or XML, or a data exchange system based
on the STEP protocol.
INTERNATIONAL STANDARD ISO 21308-2:2020(E)
Road vehicles — Product data exchange between chassis
and bodywork manufacturers (BEP) —
Part 2:
Dimensional bodywork exchange parameters
1 Scope
This document provides a set of codes for the exchange of dimensional data between truck chassis
manufacturers and bodywork manufacturers.
The process of exchanging the above information can involve:
— chassis manufacturer;
— chassis importer;
— chassis dealer;
— one or more bodywork manufacturers; and
— bodywork component suppliers, e.g. manufacturers of demountable bodies, cranes and loading
equipment, tipping equipment.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 612:1978, Road vehicles — Dimensions of motor vehicles and towed vehicles — Terms and definitions
ISO 1176, Road vehicles — Masses — Vocabulary and codes
ISO 7656:1993, Commercial road vehicles — Dimensional codes
ISO 21308-1:2018, Road vehicles — Product data exchange between chassis and bodywork manufacturers
(BEP) — Part 1: General principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 612, ISO 1176, ISO 7656 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
BEP-code
code to identify a unique measurement on the truck, to make the information exchange between chassis
manufacturers and bodywork manufacturers easier without any confusion with other systems
Note 1 to entry: BEP is an abbreviation of bodywork exchange parameter.
3.2
left and right side
left side in the driving direction and right side in the driving direction
3.3
driven axle
axle marked with an X in the drawings
3.4
front edge
most forward point of the truck as delivered from the chassis manufacturer
Note 1 to entry: Usually, the front edge is the bumper.
3.5
gross vehicle mass
GVM
gross vehicle weight
GVW
technical or legal gross vehicle mass (weight) according to the legislation or regulations for the
applicable region
Note 1 to entry: See also ISO 21308-3 and ISO 1176.
4 Coding principles
4.1 BEP codes of truck chassis and bodywork
Each characteristic, related to truck chassis and bodywork, is assigned a code composed of the items
given below. A prefix “BEP”, followed by a dash (-), shall be used to avoid confusion with other coding
systems.
BEP codes are formatted according to the principles in Table 1.
2 © ISO 2020 – All rights reserved

Table 1 — BEP coding principles
BEP-ppMccc.n.p.q.s.t
Item Assignment Description
pp Bodywork category pp = None or 00 for codes related to vehicle chassis (this document and
ISO 21308-3)
pp = 01 for codes related to loader cranes (ISO 21308-5)
pp = 02 for codes related to hook loaders (ISO 21308-6)
pp = 03 for codes related to skip loaders (ISO 21308-7)
M Measure type A capital letter, which denotes the type of code:
H = Z direction, coordinate system in accordance with ISO 4130
L = X direction, coordinate system in accordance with ISO 4130
W = Y direction, coordinate system in accordance with ISO 4130
C = Coordinate (x,y) or (x,y,z) in the Cartesian coordinate system
M = Mass (m), or mass point (m,x,y,z)
F = Force (static or dynamic)
T = Moment (static or dynamic)
R = Radius
V = Angle
G = General
A = Administrative
ccc BEP code number Code number given by the respective part of the ISO 21308 series
.n Index number .n is used to designate object number n
.p Entity number .p is used to designate a certain set of object characteristics or entities (e.g.
dimensions, coordinates, address information)
Where both .n and .p are specified, they are given in the .n .p order.
.q Corner number .q is used to designate contour corner index number
.s Side designator L or R
.t Type designator Optional coding to describe the object type (e.g. fuel tank)
The centre of the first front axle is the reference zero point for the length measurements. In some cases
where it is convenient to use the rear axle as a reference, the first driven rear axle is used.
The top of the chassis frame is the reference zero point for height measurements for objects connected
to the chassis frame.
The centre-line of the chassis is the reference zero point for width measurements.
The height information, if dependent on the tyres, refers to the actual tyre equipment as described
according to ISO 21308-3, if not otherwise stated.
NOTE 1 Dimensions, except for radius, can be positive or negative.
Annex A provides a comparison of BEP codes, according to this document, with codes used in ISO 612
and ISO 7656.
NOTE 2 Supplementary information and support tools of this document are available on the ISO Standards
Maintenance Portal. This information can be found at the following URL: https:// standards .iso .org/ iso/ 21308.
4.2 Units of BEP code values
The following units are preferred when reporting values related to BEP codes:
— dimensions (L, W, H, R) and coordinates (x,y,z) in millimetres (mm);
— masses in kilograms (kg);
— forces in Newtons (N), or kN;
— moments in Newtonmetres (Nm), or kNm;
— angles in degrees (°).
4.3 Numbering
4.3.1 General
Each item has a unique BEP-code consisting of the dimension type letter (see 4.2) and a three-digit
sequential number, starting from 001.
The dimension codes for repeated vehicle items of the same kind on one vehicle, e.g. axles, cross-
members, frame-mounted objects, etc., are differed by an added sequential number beginning with .1
counted from the front of the vehicle and rearwards.
NOTE 1 .n is used to designate object number n.
NOTE 2 In this document, .p is used to designate a certain set of object characteristics or entities (e.g.
dimensions, coordinates, address information).
NOTE 3 Where both .n and .p are specified, BEP codes are specified in the .n .p order.
For L codes, a positive value indicates that the item is located behind the axle. A negative value indicates
that the item is located in front of the axle.
For H codes, a positive value indicates that the item is located above the top of the chassis frame. A
negative value indicates that the item is located below the top of the chassis frame.
4.3.2 Numbering and type designation of frame-mounted objects
The same .p number shall be applied to a specific frame-mounted object in terms of L, H and W
dimensions.
EXAMPLE Frame-mounted objects can be a fuel tank, referred to as BEP-L030.4, BEP-H030.4, and
BEP-W.030.4, and a battery box, referred to as BEP-L030.5, BEP-H030.5, and BEP-W030.5.
For the frame-mounted objects, an optional coding (.t) may be added to describe the object type. The
following abbreviation letters are reserved for the object types below:
— A — Air tank;
— B — Battery box;
— C — Cap/filler cap
— F — Fuel tank;
— H — Hydraulic tank;
— M — Exhaust muffler;
— S — Spare wheel;
4 © ISO 2020 – All rights reserved

— T — Tool box;
— U — Urea tank;
— O — Other (other objects, specified by the applicable G code in ISO 21308-3).
NOTE Letters can be combined (e.g. FC for fuel tank filler cap).
4.4 Code assignment and description
Clauses 5, 6, and 7 show the assignment of each BEP-code together with a description of its applicability
and limitations.
4.5 Priority
The column “Priority” shows the priority of the measurements, as follows:
— A — Essential;
— B — Useful.
4.6 Loading condition
The column “Loading” shows the load situation of the chassis, as follows:
— 1 — Unladen;
— 2 — Laden (design mass).
NOTE A dash (-) means that the field is not applicable.
4.7 Presented in
The column “Presented in” describes in which type of document the items can be presented, as follows:
— 2D — 2D drawing;
— 3D — 3D model;
— TD — Technical data sheet.
NOTE An empty field means that there is no specific recommendation for the presentation. It can be covered
by any kind of document. A dash (-) means that the field is not applicable.
4.8 Related XML coding
Any XML implementation for the communication of BEP codes shall follow the requirements given in
ISO 21308-1. The XML coding related to this document shall be written according to the indications in
Annex B.
5 General dimensions
BEP-code Assignment Description Priority Loading Presented in
BEP-L001 Overall length Distance from front edge of vehicle to rear A - 2D, 3D, TD
edge of vehicle, including accessories in
both front and rear ends.
NOTE  See also ISO 612.
6 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-L002 Front Distance from the centre of the first A - 2D, 3D, TD
reference front axle to the front reference point for
point for measuring.
measuring
NOTE 1  .R or .L is added if the reference
points for right and left side member differ.
NOTE 2  If the position of the reference
point is in front of the axle, the value is
negative.
NOTE 3  Front reference point(s) for
measuring is (are) defined by the chassis
manufacturer.
BEP-L003 Rear Distance from the first driven rear axle to A - 2D, 3D, TD
reference the rear reference point for measuring.
point for
NOTE 1  .R or .L is added if the reference
measuring
points for right and left side member differ.
NOTE 2  If the position of the reference
point is in front of the axle, the value is
negative.
NOTE 3  Rear reference point(s) for
measuring is (are) defined by the chassis
manufacturer.
BEP-code Assignment Description Priority Loading Presented in
BEP-H001 Maximum Distance from ground to top of cab, A 1 2D, 3D, TD
external including cab mounted parts, with the
height, chassis unladen but in operating order.
unladen
The roof hatch, if present, should be closed
and all axles should be down. For
pneumatic suspension, the highest driving
position is assumed.
BEP-H002 Maximum Distance from ground to top of cab, A 2 2D, 3D, TD
external including cab mounted parts, in laden
height, condition.
laden
The roof hatch, if present, should be closed
and all axles should be down. For
pneumatic suspension, the highest driving
position is assumed.
The chassis is laden up to "Technical gross
vehicle mass".
BEP-H003 Maximum Distance from ground to the highest point A 1 2D, 3D, TD
overall height of the vehicle including bodywork.
of vehicle,
For pneumatic suspension, the highest
unladen
driving position is assumed.
8 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-W001 Overall width Maximum external width of the vehicle A - 2D, 3D, TD
of chassis chassis.
with cab
NOTE  Rear-view mirrors in outermost
position, lights, elastic mud flaps, tyre
bulges in the road area and snow chains
are included in the width stated. The
bodywork is not taken into account.
BEP-W002 Width across External width of cab. A - 2D, 3D, TD
cab
NOTE  Mudguards and rear-view mirrors
are disregarded.
BEP-W003.n Width across External width across the wheels on the A - 2D, 3D, TD
wheels on n-th n-th axle.
axle
NOTE  Projecting axle hubs and tyre
bulges are disregarded.
6 Chassis related dimensions
6.1 Axle and wheel related dimensions
BEP-code Assignment Description Priority Loading Presented in
BEP-L010 Total wheel- Distance between centre of first front A - 2D, 3D, TD
base axle to the centre of the last axle.
10 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-L011 Configuration Distance between centre of first front A - 2D, 3D, TD
wheelbase axle to the centre of first driven rear
axle.
NOTE  .R or .L is added if the vehicle is
not symmetrical and different values
for right and left hand side apply.
BEP-code Assignment Description Priority Loading Presented in
BEP-L012.n Wheel space Distance between centre of wheels on A - 2D, 3D, TD
from n to n+1 n-th and (n+1)-th axles.
axle
BEP-L013 Theoretical Distance between first front axle to A 2 2D, TD
wheelbase of calculated mass line of front axle
front axle combination.
combination
BEP-L014 Theoretical Distance between first driven rear axle A 2 2D, TD
wheelbase of to calculated mass line of rear axle
rear axle combination.
combination
12 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-L015 Theoretical Distance between the calculated mass A 2 2D, TD
wheelbase lines of front and rear axle
combinations.
NOTE 1  For a single axle, either in the
front or in the rear, the calculated mass
line is identical to the axle centre line.
NOTE 2  If there is an axle combination
either in the front or rear, the
calculated mass line is the calculated
line between the axles where the load
from the axles is focused.
NOTE 3  For air suspension systems
with electronic control, the calculated
mass line is variable while driving.
EXAMPLE  A, B, C, D can have the
following distribution, shown in the
figures below:
A = 50 %, B = 50 %, C = 60 %, D = 40 %
BEP-code Assignment Description Priority Loading Presented in
BEP-L016 Front vehicle Distance between front edge of vehicle A - 2D, 3D, TD
overhang and centre of wheel on first axle.
BEP-L017 Rear vehicle Distance between centre of last axle A - 2D, 3D, TD
overhang and rearmost part of vehicle.
BEP-L018 Front frame Distance from foremost edge of front A - 2D, 3D, TD
overhang frame to centre of first front axle.
BEP-L019 Rear frame Distance between the centre of last axle A - 2D, 3D, TD
overhang to rearmost edge of frame side member.
BEP-L020 Rear frame Distance between the centre of first A - 2D, 3D, TD
overhang from driven rear axle to rearmost edge of
first driven frame side member.
rear axle
BEP-L021 Technical Distance between calculated mass lines B 2 2D, 3D, TD
overhang of rear axle combination and rearmost
length edge of vehicle or bodywork.
EXAMPLE  A and B can have the
following distribution:
A = 60 %, B = 40 %
BEP-V010 Approach Angle between the tangent of the B 2 2D, 3D, TD
angle rolling radius of the tyres and the
lowest fixed point of the vehicle in front
of the axle, for technical front axle mass.
NOTE  Chassis loaded to permitted
axle masses. For pneumatic suspension,
the drive position is assumed.
CAUTION — Code BEP-V010 replaces
BEP-H010 from ISO 21308-2:2006,
with identical definition. Both codes
shall not be used simultaneously.
14 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-V011 Departure Angle between the tangent of the B 2 2D, 3D, TD
angle rolling radius of the tyres and the
lowest fixed point of the vehicle behind
the axle, for technical rear axle mass.
NOTE  Chassis loaded to permitted
axle masses. For pneumatic suspension,
the drive position is assumed.
CAUTION — Code BEP-V011 replaces
BEP-H011 from ISO 21308-2:2006,
with identical definition. Both codes
shall not be used simultaneously.
BEP-V012 Ramp angle See ISO 612 and ISO 7656. B 2 2D, 3D, TD
CAUTION — Code BEP-V012 replaces
BEP-H012 from ISO 21308-2:2006,
with identical definition. Both codes
shall not be used simultaneously.
BEP-H013 Ground Distance between the ground and the A 2 2D, 3D, TD
clearance, lowest fixed point between the centre
rear part of the last front axle and the rearmost
part of the chassis.
NOTE  Chassis loaded to permitted
axle masses. For pneumatic suspension,
the drive position is assumed.
BEP-code Assignment Description Priority Loading Presented in
BEP-H014 Ground Distance between the ground and the A 2 2D, 3D, TD
clearance, lowest fixed point between the front
front part part of the chassis and the centre of the
last front axle.
NOTE  Chassis loaded to permitted
axle masses. For pneumatic suspension,
the drive position is assumed.
BEP-H015.n Ground Smallest vertical dimension between A 2 2D, 3D, TD
clearance, vehicle front axle(s) and ground level.
front axle(s)
NOTE  Chassis loaded to permitted
axle masses. For pneumatic suspension,
the drive position is assumed.
BEP-H016.n Ground Smallest vertical dimension between A 2 2D, 3D, TD
clearance, vehicle rear axle(s) and ground level.
rear axle(s)
NOTE  Chassis loaded to permitted
axle masses. For pneumatic suspension,
the drive position is assumed.
16 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-L022.n Tyre diameter Tyre, free diameter, on n-th axle. A 1 2D, 3D, TD
on n-th axle
BEP-W016.n Distance Distance between tyre inner edges on A - 2D, 3D, TD
between tyre n-th axle
inner edges on
NOTE  Projecting axle hubs and tyre
n-th axle
bulges are disregarded.
BEP-H017 Front Distance between the ground and the A 1 2D, 3D, TD
underrun uppermost part of the front underrun
protection, protection.
upper
BEP-H018 Front Distance between the ground and the A 1 2D, 3D, TD
underrun lowest part of the front underrun
protection, protection.
lower
BEP-H019.n Side underrun Distance between the ground and the A 1 2D, 3D, TD
protection(s), uppermost part of the side underrun
upper protection.
NOTE  The distance is measured at
the centreline of the side underrun
protection.
BEP-H020.n Side underrun Distance between the ground and the A 1 2D, 3D, TD
protection(s), lowest part of the side underrun
lower protection.
NOTE  The distance is measured at the
centreline of the side underrun
protection.
BEP-H021 Rear Distance between the ground and the A 1 2D, 3D, TD
underrun uppermost part of the rear underrun
protection, protection.
upper
BEP-H022 Rear Distance between the ground and the A 1 2D, 3D, TD
underrun lowest part of the rear underrun
protection, protection.
lower
BEP-code Assignment Description Priority Loading Presented in
BEP-L023 Rear Distance between the last axle and the A 1 2D, 3D, TD
underrun rear face of the rear underrun
protection, protection, minimum and fixed position.
longitudinal
position
BEP-L024 Rear Distance between the last axle and the A 1 2D, 3D, TD
underrun rear face of the rear underrun
protection, protection, maximum position of
longitudinal adjustable underrun protection.
position
NOTE 1  The code applies to adjustable
underrun protection only.
NOTE 2  Relationship to rear end of
bodywork can be expressed as a
combination of L017 and L024.
18 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-V013.n.s Steering angle Maximum steering angle of wheels. B 1 2D, 3D, TD
NOTE  .n for n-th steerable axle, L/R
for left or right side, lt/rt for left or
right turn.
EXAMPLE  BEP-V013.1.R.rt means first
steerable axle, right side, right turn.
CAUTION — Code BEP-V013 replaces
BEP-W010 from ISO 21308-2:2006,
with identical definition. Both codes
shall not be used simultaneously.
BEP-code Assignment Description Priority Loading Presented in
BEP-R011 Turning circle The radius of the circle described A 2 TD
radius by the centre of the tyre of the outer
steered wheel at the first front axle at
maximum steering angle.
NOTE  .R or .L is added if there is a
difference between left hand and right
hand turning circle.
EXAMPLE  BEP-R011.L.
BEP-R012 Clearance The radius of the circle described by A 2 TD
circle radius the outer edge of the vehicle at
maximum steering angle.
NOTE 1  The outer edge includes
external equipment, e.g. mirrors.
NOTE 2  .R or .L is added if there is a
difference between left hand and right
hand turning circle.
EXAMPLE  BEP-R012.L.
20 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-W013.n Track Distance between centres of the tyres A 1 2D, 3D, TD
of the n-th axle.
NOTE  In case of twin tyres, the centre
between the two centres of the tyres
on the same side is used.
BEP-code Assignment Description Priority Loading Presented in
BEP-W014.n Twin tyre Distance between the centres of the B 1 2D, 3D, TD
distance two tyres of the n-th axle on one side.
22 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-W015.n Spring track Distance between the centreline of B 1 2D, 3D, TD
distance springs at the n-th axle.

6.2 Chassis frame related dimensions
BEP-code Assignment Description Priority Loading Presented in
BEP-L030.p.t Start of chassis- Distance between the centre of the A - 2D, 3D, TD
mounted object, first front axle and the foremost part
length of object p mounted on the chassis.
NOTE 1  .R or .L is added
(if applicable) to specify the
mounting side, related to the
centreline of the chassis.
NOTE 2  It is applicable to objects both
inside and outside the chassis frame.
NOTE 3  Optional object type coding
(.t), see 4.3.2.
EXAMPLE  Air tank, fuel tank,
battery box, electrical and electronic
interface, pneumatic interface,
exhaust parts, side underrun
protection, etc.
BEP-L031.p.t End of chassis- Distance between the centre of the A - 2D, 3D, TD
mounted object, first front axle and the rearmost end
length of object p mounted on the chassis.
NOTE 1  .R or .L is added
(if applicable) to specify the
mounting side, related to the
centreline of the chassis.
NOTE 2  It is applicable to objects both
inside and outside the chassis frame.
NOTE 3  Optional object type coding
(.t), see 4.3.2.
EXAMPLE  Air tank, fuel tank,
battery box, electrical and electronic
interface, pneumatic interface,
exhaust parts, side underrun
protection, etc.
24 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-H030.p.t Start of chassis- Distance from the top of chassis A - 2D, 3D, TD
mounted object, frame to the highest part of object p
height mounted on the chassis.
NOTE 1  .R or .L is added
(if applicable) to specify the
mounting side, related to the
centreline of the chassis.
NOTE 2  It is applicable to objects both
inside and outside the chassis frame.
NOTE 3  Optional object type coding
(.t), see 4.3.2.
NOTE 4  Positive values indicate
above top of chassis, and negative
values indicate below top of chassis.
EXAMPLE  Air tank, fuel tank,
battery box, electrical and electronic
interface, pneumatic interface,
exhaust parts, side underrun
protection, etc.
BEP-H031.p.t End of chassis- Distance from the top of chassis A - 2D, 3D, TD
mounted object, frame to the lowest part of object p
height mounted on the chassis.
NOTE 1  .R or .L is added
(if applicable) to specify the
mounting side, related to the
centreline of the chassis.
NOTE 2  It is applicable to objects both
inside and outside the chassis frame.
NOTE 3  Optional object type coding
(.t), see 4.3.2.
NOTE 4  Positive values indicate
above top of chassis, and negative
values indicate below top of chassis.
EXAMPLE  Air tank, fuel tank,
battery box, electrical and electronic
interface, pneumatic interface,
exhaust parts, side underrun
protection, etc.
BEP-code Assignment Description Priority Loading Presented in
BEP-W030.p.t Start of chassis- Distance from the centreline of A - 2D, 3D, TD
mounted object, chassis frame to the nearest part of
width object p mounted on the chassis.
NOTE 1  .R or .L is added
(if applicable) to specify the
mounting side, related to the
centreline of the chassis.
NOTE 2  It is applicable to objects both
inside and outside the chassis frame.
NOTE 3  Optional object type coding
(.t), see 4.3.2.
EXAMPLE  Air tank, fuel tank,
battery box, electrical and electronic
interface, pneumatic interface,
exhaust parts, side underrun
protection, etc.
BEP-W031.p.t End of chassis- Distance from the centreline of A - 2D, 3D, TD
mounted object, chassis frame to the furthest part of
width object p mounted on the chassis.
NOTE 1  .R or .L is added
(if applicable) to specify the
mounting side, related to the
centreline of the chassis.
NOTE 2  It is applicable to objects both
inside and outside the chassis frame.
NOTE 3  Optional object type coding
(.t), see 4.3.2.
EXAMPLE  Air tank, fuel tank,
battery box electrical and electronic
interface, pneumatic interface,
exhaust parts, side underrun
protection, etc.
26 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-code Assignment Description Priority Loading Presented in
BEP-L032 Length of frame Distance between the centre of the B - TD
from centre of first front axle and the rear end of the
first front axle chassis.
BEP-L033 Minimum length Minimum distance between the B - TD
of frame from centre of the first front axle and the
centre of first rear end of the chassis.
front axle
NOTE  It is shortest possible chassis
frame overhang on the rear end
recommended by the chassis
manufacturer. This is to enable
bodywork designers to establish the
chassis cut off-point whilst allowing
sufficient space for cleating at the
rear of the chassis frame.
EXAMPLE  Cutting the overhang
behind the spring hanger bracket.
28 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-L034 Front edge Distance from front edge of front A - 2D, 3D, TD
of front cross- cross-member to centre of first
member front axle.
BEP-L035 Towing member Distance from centre of the first A - 2D, 3D, TD
reference driven rear axle to rear cross-
position member mounting surface for trailer
couplings.
NOTE  In case of several rear
cross-members, they can be marked
BEP-L035.1, BEP-L035.2.
BEP-code Assignment Description Priority Loading Presented in
BEP-H032.p Frame section Profile height of frame section p. A - 2D, 3D, TD
profile height
BEP-H033.p Frame section Thickness of frame section profile p A - 2D, 3D, TD
profile bottom bottom.
thickness
BEP-H034.p Frame section Thickness of frame section profile p A - 2D, 3D, TD
profile top top.
thickness
BEP-W032.p Frame section Width of frame section profile p A - 2D, 3D, TD
profile bottom bottom.
width
BEP-W033.p Frame section Width of frame section profile p top. A - 2D, 3D, TD
profile top width
BEP-W034.p Frame section Thickness of frame section profile p A - 2D, 3D, TD
profile waist waist.
thickness
NOTE 1  Codes BEP-H032.p to BEP-H034.p and BEP-W032.p to BEP-W034.p show some common profiles. Fur-
ther profile alternatives can be defined by the chassis and bodywork manufacturers.
NOTE 2  For positioning of frame section profile, see BEP-L048 and related codes.
NOTE 3  In case the coding above is not detailed enough, the reinforcement codes (BEP-H052 and related
codes) can be used.
30 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-L036.n.t Distance to the Distance from the centre of the first A - 2D, 3D, TD
front edge of front axle to the front edge of the n-th
the n-th front intermediate cross-member on the
intermediate centre-line of the chassis.
cross-member
NOTE 1  Each cross-member is
identified by a number (n).
NOTE 2  When the value is negative,
the position of the cross-member is in
front of the axle. If it is positive, the
position is behind the axle.
NOTE 3  The cross-members are
defined in different types (t),
specified with e.g. A, B, C, etc. Each
definition of type includes the
description of the exact position
and profile of each cross-member.
EXAMPLE  BEP-L036.2.A means
second cross-member, type A.
BEP-L037.n.t Distance to the Distance from the centre of the first A - 2D, 3D, TD
front edge of driven rear axle to the front edge of
the n-th rear the n-th intermediate cross-member
intermediate on the centre-line of the chassis.
cross-member
NOTE 1  Each cross-member is
identified by a number (n).
NOTE 2  When the value is negative,
the position of the cross-member is in
front of the axle. If it is positive, the
position is behind the axle.
NOTE 3  The cross-members are
defined in different types (t),
specified with e.g. A, B, C, etc. Each
definition of type includes the
description of the exact position
and profile of each cross-member.
EXAMPLE  BEP-L037.5.C means fifth
cross-member, type C.
BEP-code Assignment Description Priority Loading Presented in
BEP-L038.n.t Distance to the Distance from the centre of the first A - 2D, 3D, TD
hole pattern in front axle to the index point for
the front part of positioning, of the n-th hole pattern
frame in frame.
NOTE 1  .R or .L is added if the frame
side members are not symmetrical
and different values for right and left
hand side apply.
NOTE 2  A negative value indicates
that the hole-pattern is in front of the
axle. A positive value indicates that it
is behind the axle.
NOTE 3  A unique number (n)
identifies each hole pattern.
NOTE 4  The hole patterns are
defined in different types (t),
specified e.g. with A, B, C, etc. Each
definition of type includes the
description of:
— index point for positioning;
— hole dimension;
— hole shape (cylindrical, oblong,
etc.);
— hole type (drilled, punched, etc.);
— relative positions including
transformation information;
— x, y, z-position relative to the
given value and their tolerance.
EXAMPLE  BEP-038.L.2.A means left
side-member, hole pattern 2, type A.
32 © ISO 2020 – All rights reserved

BEP-code Assignment Description Priority Loading Presented in
BEP-L039.n.t Distance to the Distance from the centre of the first A - 2D, 3D, TD
hole pattern in driven rear axle to the index point for
the rear part of positioning, of the n-th hole pattern
frame in frame.
NOTE 1  .R or .L is added if the frame
side members are not symmetrical
and different values for right and left
hand side apply.
NOTE 2  A negative value indicates
that the hole-pattern is in front of the
axle. A positive value indicates that it
is behind the axle.
NOTE 3  A unique number (n)
identifies each hole pattern.
NOTE 4  The hole patterns are
defined in different types (t),
specified e.g. with A, B, C, etc.
Each definition of type includes the
description of:
— index point for positioning;
— hole dimension;
— hole shape (cylindrical, oblong,
etc.);
— hole type (drilled, punched, etc.);
— relative positions including
transformation
information;
— x, y, z-position relative to the
given value and their tolerance.
EXAMPLE  BEP-L039.L.4.C means left
side-member, hole pattern 4 on the
rear part of the frame, type C.
BEP-code Assignment Description Priority Loading Presented in
BEP-L040.n Start of Di
...