ISO 657-1:2026

Hot-rolled steel sections — Dimensions, sectional properties and tolerances — Part 1: Angles, sloping flange channels and sloping flange beams

This document specifies requirements for dimensions, sectional properties and tolerances for hot-rolled sections as follows: equal angle LE (L section); unequal angle LU (L section); sloping flange channel US (U section); sloping flange I beam IS(I section). This document is used together with technical delivery conditions especially, but is not limited, ISO 630-1, ISO 630-2, ISO 630-3, ISO 630-5 and ISO 630-6.

Profilés en acier laminés à chaud — Dimensions et caractéristiques rapportées aux axes — Partie 1: Cornières, profilés en U à ailes inclinées et poutrelles à ailes inclinées

General Information

• Status: Published
• Publication Date: 26-Apr-2026
• ICS: 77.140.70 - Steel profiles
• Technical Committee: ISO/TC 17/SC 3 - Steels for structural purposes
• Current Stage: 6060 - International Standard published
• Start Date: 27-Apr-2026
• Due Date: 29-May-2027
• Completion Date: 27-Apr-2026

Relations

• Revises: ISO 657-11:1980 - Hot-rolled steel sections — Part 11: Sloping flange channel sections (Metric series) — Dimensions and sectional properties
• Effective Date: 01-Jun-2024
• Revises: ISO 657-5:1976 - Hot-rolled steel sections — Part 5: Equal-leg angles and unequal-leg angles — Tolerances for metric and inch series
• Effective Date: 01-Jun-2024
• Revises: ISO 657-15:1980 - Hot-rolled steel sections — Part 15: Sloping flange beam sections (Metric series) — Dimensions and sectional properties
• Effective Date: 01-Jun-2024
• Revises: ISO 657-1:1989 - Hot-rolled steel sections — Part 1: Equal-leg angles — Dimensions
• Effective Date: 01-Jun-2024
• Revises: ISO 657-2:1989 - Hot-rolled steel sections — Part 2: Unequal-leg angles — Dimensions
• Effective Date: 01-Jun-2024

Overview

ISO 657-1:2025, published by the International Organization for Standardization (ISO), establishes requirements for the dimensions, sectional properties, and tolerances of hot-rolled steel sections. This document covers key section types such as equal angles (LE), unequal angles (LU), sloping flange channels (US), and sloping flange I beams (IS). ISO 657-1 is intended for use in conjunction with technical delivery conditions, notably standards like ISO 630-1, ISO 630-2, ISO 630-3, ISO 630-5, and ISO 630-6.

By standardizing the geometric and physical properties of hot-rolled steel sections, ISO 657-1 provides clarity for manufacturers, fabricators, engineers, and architects, ensuring consistent product quality and structural performance worldwide.

---

Key Topics

• Section Types Defined:

  • Equal angle (LE) and unequal angle (LU) L sections
  • Sloping flange channel (US) U sections
  • Sloping flange I beam (IS) I sections

• Sectional Properties:

  • Sectional area, nominal mass, moment of inertia, radius of gyration, section modulus, and center of gravity parameters, supporting effective design and analysis.

• Dimensional Specifications and Tolerances:

  • Standardized expressions for profile dimensions and mass
  • Allowable deviations in dimensions, straightness, out-of-square, web flatness, and length
  • Tolerances based on industry and customer requirements, with reference to additional regional and international standards

• Surface Condition:

  • Requirements for surface quality as specified in ISO 20723, ensuring suitability for structural and aesthetic applications.

• Designation System:

  • A clear system for identifying products, including section type, size, material specification, and steel grade, simplifying communication and procurement across the steel construction industry.

---

Applications

ISO 657-1 is essential for various stakeholders in the construction and manufacturing sectors:

• Structural Engineering: Standardized steel sections are widely used in constructing buildings, bridges, and industrial frameworks, facilitating reliable load-carrying capacity and uniform structural behavior.
• Procurement and Supply Chains: Uniform dimensional and tolerance requirements streamline steel section ordering, specification, and acceptance across international markets.
• Manufacturing and Fabrication: Accurate section properties support efficient material usage, automated fabrication lines, and ease of assembly for numerous steel structures.
• Quality Assurance: The document offers a reference point for verifying compliance with dimensional and surface requirements, enabling consistent product inspection and certification.

Using hot-rolled steel sections produced according to ISO 657-1 allows for optimized design, improved compatibility between components, and safer, more sustainable structures.

---

Related Standards

ISO 657-1 is often referenced alongside other technical and delivery condition standards, supporting an integrated approach to steel construction:

• ISO 630 Series - Structural steel product delivery conditions:

  • ISO 630-1: General requirements
  • ISO 630-2: Weldable fine grain steels
  • ISO 630-3: Plates, wide flats, and sections for bridge building
  • ISO 630-5: Structural steels for building
  • ISO 630-6: Delivery conditions for other purposes

• ISO 6929 - Steel products vocabulary, ensuring clear terminology.

• ISO 20723 - Surface condition requirements for hot-rolled structural steels.

Other regional standards (such as EN 10056, EN 10365, JIS G 3192, and GB/T 706) may be referenced if specific dimensional or tolerance requirements are agreed upon.

---

By adopting ISO 657-1, organizations benefit from international best practices in structural steel section specification, ensuring interoperability, safety, and quality in steel-based construction projects. For comprehensive dimensional tables and formulae for sectional properties, see the informative annexes included in the standard.

Standards Content (Sample)

International
Standard
ISO 657-1
Second edition
Hot-rolled steel sections —
2026-04
Dimensions, sectional properties
and tolerances —
Part 1:
Angles, sloping flange channels and
sloping flange beams
Profilés en acier laminés à chaud — Dimensions et
caractéristiques rapportées aux axes —
Partie 1: Cornières, profilés en U à ailes inclinées et poutrelles à
ailes inclinées
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions, shape, mass and tolerances . 1
4.1 Dimensions and designation .1
4.2 Tolerances on dimension and shape .2
4.3 Tolerances on length.8
4.4 Mass and tolerances .9
5 Surface condition . . 9
Annex A (informative) Sectional dimensions, sectional area, nominal mass and sectional
properties . 10
Annex B (informative) Calculation formulae of sectional area .23
Bibliography .24

iii
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 17, Steel, Subcommittee SC 3, Steels for
structural purposes.
This first edition of ISO 657-1 cancels and replaces ISO 657-1:1989, ISO 657-2:1989, ISO 657-5:1976,
ISO 657-11:1980, ISO 657-15:1980, which have been technically revised.
The main are as follows:
— revised designation of section steels;
— revised tolerance of section steels;
— revised sectional properties of section steels;
— added requirements of surface conditions.
A list of all parts in the ISO 657 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
International Standard ISO 657-1:2026(en)
Hot-rolled steel sections — Dimensions, sectional properties
and tolerances —
Part 1:
Angles, sloping flange channels and sloping flange beams
1 Scope
This document specifies requirements for dimensions, sectional properties and tolerances for hot-rolled
sections as follows:
a) equal angle LE (L section);
b) unequal angle LU (L section);
c) sloping flange channel US (U section);
d) sloping flange I beam IS(I section).
This document is used together with technical delivery conditions especially, but is not limited, ISO 630-1,
ISO 630-2, ISO 630-3, ISO 630-5 and ISO 630-6.
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 6929, Steel products — Vocabulary
ISO 20723, Structural steels — Surface condition of hot-rolled sections — Delivery requirements
3 Terms and definitions
For the purpose of this documents, the terms and definitions given in ISO 6929 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Dimensions, shape, mass and tolerances
4.1 Dimensions and designation
4.1.1 Profiles of section steel are shown in Figure 1 to Figure 4.

4.1.2 The sectional area and the unit mass of steel sections obtained in terms of the standard sectional
dimension are given in Table A.1 to Table A.4 of Annex A. If agreed between the purchaser and manufacturer,
other dimensional tables may be used, e.g. GB/T 706, JIS G 3192, EN 10056-1 and EN 10365.
Besides the sectional area and the unit mass, Table A.1 to Table A.4 of Annex A show the moment of inertia,
radius of inertia, modulus of section and centre of gravity distance calculated by electronic devices or
software for reference.
4.1.3 The designation of the hot-rolled equal and unequal leg angles, taper flange I-sections and taper
flange U sections shall comprise:
a) the number of this document;
b) the letter for equal angle LE (L section) or unequal angle LU (L section) or sloping flange channel US (U
section) or sloping flange beam IS(I-section);
c) height and width (in mm);
d) the leg width B or B (in mm) and if necessary, the leg thickness t(in mm), web thickness t (in mm)and/
L S w
or flange middle thickness t (in mm);
f
e) a reference to the material standard (e.g. ISO 630-2);
f) the steel name (e.g. S355D).
Example of designation for an unequal angle with long leg width B =25 mm and short leg width Bs =16 mm
L
and leg thickness of 3 mm made from steel grade S355D as specified in ISO 630-2:
ISO 657-1– LU 25× 16 × 3 – ISO 630-2 – S355D
4.2 Tolerances on dimension and shape
4.2.1 The tolerances on section steel shall be in accordance with the requirements in Table 1 and Table 2.
If agreed between the purchaser and the manufacturer, other tolerances on dimension and shape may be
used, e.g. GB/T 706, JIS G 3192, EN 10024, EN 10056-2 and EN 10279.
4.2.2 The out-of-square and web flatness for the sloping flange I beams and the sloping flange channels,
and the top corner for the angles shall be checked at a distance to the end not less than 750 mm.

Key
B leg width
t leg thickness
r root radius
r toe root radius
C distance of centre of gravity
x
Figure 1 — Profile of equal leg angles
Key
B long leg width
L
B short leg width
s
t leg thickness
r root radius
r toe root radius
C distance of centre of gravity
y
C distance of centre of gravity
x
Figure 2 — Profile of unequal-leg angles

Key
H height
B width
t web thickness
w
t flange middle thickness
f
r root radius
r toe root radius
C distance of centre of gravity
y
α flange taper, tanα =1/10.
2 2
NOTE The different degrees of slope will result in different sectional area.
Figure 3 — Profile of sloping flange channels

Key
H height
B width
t web thickness
w
t flange middle thickness
f
r root radius
r toe root radius
α flange taper, tanα =1/6.
1 1
NOTE The different degrees of slope will result in different sectional area.
Figure 4 — Profile of sloping flange I beams

Table 1 — Tolerances on dimensions and shape of angles
Dimensions in millimetres
Tolerance
Dimensions and shape Diagram
Equal leg Unequal-leg
angles angles
a
B ≤56 ±0,8 ±0,8
Leg a
56 width
a
90 (B,B or
L
a
140 B )
S
a
B >200 ±3,5 ±3,5
t<5 ±0,6
5≤t<10 ±0,7
a
B <130
10≤t<15 ±0,8
t≥15 ±1,0
t<5 ±0,7
Leg
5≤t<10 ±0,8
thick-
ness
10≤t<15 ±1,0
(t)
15≤t<25 ±1,2
a
B ≥130
t≥25 ±1,5
Out-of-square
a, b
T≤2,5 %B
( T)
≤ 3 mm/m
Straightness Apply to camber and sweep
≤ 0,30 % of total length
NOTE The dimensions and shapes shall be measured according to the diagrams shown in this table.
a
For unequal angles steel, it shall be applicable to the longer side width B .
L
b
The purchaser may designate that the out-of-square shall be 2,0 % or under of the leg length B for equal leg angles 200 mm or
over in leg length.
Table 2 — Tolerances on dimension and shape of sloping flange I beams and sloping flange channels
Dimensions in millimetres
Dimensions and shape Tolerance Profile
H<100 ±1,5
100≤H<200 ±2,0
Height
(H)
200≤H<400 ±3,0
H≥400 ±4,0
B<50 ±1,5
50≤B<100 ±2,0
Width
(B)
100≤B<200 ±3,0
B≥200 ±4,0
t <5 ±0,6
w
Web Thick-
5≤t <10 ±0,8
w
ness
10≤t <15 ±1,0
w
(t )
w
t ≥15 ±1,2
w
t <5 ±0,7
f
Flange
5≤t <10 ±1,0
f
middle
10≤t <15 ±1,2
f
Thickness
(t )
f
t ≥15 ±1,5
f
Out-of-square T or T ≤1,5 %B
1 2
(T ,T ) T +T ≤2,5 %B
1 2 1 2
NOTE The dimensions and shapes shall be measured according to the diagrams shown in this table.

TTaabblle 2 e 2 ((ccoonnttiinnueuedd))
Dimensions and shape Tolerance Profile
H≤100 ±0,5
100 200 Web Flat-
ness
(W)
H>400 ±1,5
≤ 2 mm/m
Sloping flange I beams
≤ 0,20 % of total
length
Straightness Apply to camber and sweep.
≤ 3 mm/m
Sloping flange chan-
≤ 0,30 % of total
nels
length
H<100 ±1,5
100≤H<150 ±2,0
150≤H<200 ±2,5
200≤H<300 ±3,0
300≤H<400 ±3,5
Sloping
Eccentricity
flange I
(S)
beams
H≥400 ±4,0
S= (b -b ) /2
1 2
NOTE The dimensions and shapes shall be measured according to the diagrams shown in this table.
4.3 Tolerances on length
The length tolerance shall be in accordance with Table 3. If agreed between the purchaser and the
manufacturer, other tolerances on length may be used, e.g. JIS G 3192, GB/T 706, EN 10024, EN 10056-2 and
EN 10279.
Table 3 — Tolerance on length
Dimensions in millimetres
Length Tolerance
+50
≤8 000
+80
>8 000
4.4 Mass and tolerances
4.4.1 Section steel shall be delivered according to nominal mass calculated on the basis of density of steel
of 7,85g/cm . The calculation formula of section area for calculating nominal mass is listed in Annex B. If
agreed between the purchaser and the manufacturer and indicated in contract, it may be delivered by actual
mass.
4.4.2 The tolerance on mass calculated by Formula (1) shall not exceed ±5 % applicable to one batch of the
same size and more than 1 ton. When one batch of the same size is not more than 1 ton, but the number of
pieces is greater than 10, it shall be also applied. If agreement between the purchaser and the manufacture,
other tolerances may be used, e.g. GB/T 706, JIS G 3192, EN10024, EN10056-2 and EN 10279.
mm
m 100% (1)
m
where
Δm is the tolerance on mass, expressed in per cent (%);
m is the actual mass, expressed in kilometre (kg);
m is the nominal mass, expressed in kilometre (kg).
5 Surface condition
Surface condition of steel sections shall be in accordance with the requirements of ISO 20723.

Annex A
(informative)
Sectional dimensions, sectional area, nominal mass and sectional
properties
Table A.1 — Sectional dimensions, sectional area, nominal mass and sectional properties of equal-leg angles
Distance
of centre
Sectional 4 3
Surface
Dimensions, mm Moment of inertia, cm Radius of inertia, cm Modulus of section, cm
Section Mass,
of gravity
area,
area,
symbol kg/m
2 , cm
m /m
cm
B t r I I I i i i W W W C
1 x U V x U V x U V x
3 1,132 0,89 0,078 0,40 0,63 0,17 0,59 0,75 0,39 0,29 0,45 0,20 0,60
2 20
4 1,459 1,15 0,077 0,50 0,78 0,22 0,58 0,73 0,38 0,36 0,55 0,24 0,64
3,5
3 1,432 1,12 0,098 0,82 1,29 0,34 0,76 0,95 0,49 0,46 0,73 0,33 0,73
2.5 25
4 1,859 1,46 0,097 1,03 1,62 0,43 0,74 0,93 0,48 0,59 0,92 0,40 0,76
3 1,749 1,37 0,117 1,46 2,31 0,61 0,91 1,15 0,59 0,68 1,09 0,51 0,85
3.0 30
4 2,276 1,79 0,117 1,84 2,92 0,77 0,90 1,13 0,58 0,87 1,37 0,62 0,89
3 4,5 2,109 1,66 0,141 2,58 4,09 1,07 1,11 1,39 0,71 0,99 1,61 0,76 1,00
3.6 36 4 2,756 2,16 0,141 3,29 5,22 1,37 1,09 1,38 0,70 1,28 2,05 0,93 1,04
5 3,382 2,65 0,141 3,95 6,24 1,65 1,08 1,36 0,7 1,56 2,45 1,00 1,07
3 2,359 1,85 0,157 3,59 5,69 1,49 1,23 1,55 0,79 1,23 2,01 0,96 1,09
4 40 4 3,086 2,42 0,157 4,60 7,29 1,91 1,22 1,54 0,79 1,60 2,58 1,19 1,13
5 3,792 2,98 0,156 5,53 8,76 2,30 1,21 1,52 0,78 1,96 3,10 1,39 1,17
3 5 2,659 2,09 0,177 5,17 8,20 2,14 1,40 1,76 0,89 1,58 2,58 1,24 1,22
4 3,486 2,74 0,177 6,65 10,6 2,75 1,38 1,74 0,89 2,05 3,32 1,54 1,26
4.5 45
5 4,292 3,37 0,176 8,04 12,7 3,33 1,37 1,72 0,88 2,51 4,00 1,81 1,30
6 5,077 3,99 0,176 9,33 14,8 3,89 1,36 1,70 0,80 2,95 4,64 2,06 1,33
3 2,971 2,33 0,197 7,18 11,4 2,98 1,55 1,96 1,00 1,96 3,22 1,57 1,34
4 3,897 3,06 0,197 9,26 14,7 3,82 1,54 1,94 0,99 2,56 4,16 1,96 1,38
5 50 5,5
5 4,803 3,77 0,196 11,2 17,8 4,64 1,53 1,92 0,98 3,13 5,03 2,31 1,42
6 5,688 4,46 0,196 13,1 20,7 5,42 1,52 1,91 0,98 3,68 5,85 2,63 1,46
3 3,343 2,62 0,221 10,2 16,1 4,24 1,75 2,20 1,13 2,48 4,08 2,02 1,48
4 4,39 3,45 0,220 13,2 20,9 5,46 1,73 2,18 1,11 3,24 5,28 2,52 1,53
5 5,415 4,25 0,220 16,0 25,4 6,61 1,72 2,17 1,10 3,97 6,42 2,98 1,57
5.6 56 6
6 6,42 5,04 0,220 18,7 29,7 7,73 1,71 2,15 1,10 4,68 7,49 3,40 1,61
7 7,404 5,81 0,219 21,2 33,6 8,82 1,69 2,13 1,09 5,36 8,49 3,80 1,64
8 8,367 6,57 0,219 23,6 37,4 9,89 1,68 2,11 1,09 6,03 9,44 4,16 1,68
5 5,829 4,58 0,236 19,9 31,6 8,21 1,85 2,33 1,19 4,59 7,44 3,48 1,67
6 6,914 5,43 0,235 23,4 36,9 9,60 1,83 2,31 1,18 5,41 8,70 3,98 1,70
6 60 6,5
7 7,977 6,26 0,235 26,4 41,9 11,0 1,82 2,29 1,17 6,21 9,88 4,45 1,74
8 9,02 7,08 0,235 29,5 46,7 12,3 1,81 2,27 1,17 6,98 11,0 4,88 1,78
NOTE The toe root radius r (r =1/3t) as shown in Figure 1 and the root radius r in this table are given only for information and for calculating the properties of the sections.
2 2 1
Table A.1 (continued)
Distance
of centre
Sectional
Surface 4 3
Dimensions, mm Moment of inertia, cm Radius of inertia, cm Modulus of section, cm
Section Mass,
of gravity
area,
area,
symbol kg/m
, cm
m /m
cm
B t r I I I i i i W W W C
1 x U V x U V x U V x
4 4,978 3,91 0,248 19,0 30,2 7,89 1,96 2,46 1,26 4,13 6,78 3,29 1,70
5 6,143 4,82 0,248 23,2 36,8 9,57 1,94 2,45 1,25 5,08 8,25 3,90 1,74
6 7,288 5,72 0,247 27,1 43,0 11,2 1,93 2,43 1,24 6,00 9,66 4,46 1,78
6.3 63 7
7 8,412 6,60 0,247 30,9 49,0 12,8 1,92 2,41 1,23 6,88 11,0 4,98 1,82
8 9,515 7,47 0,247 34,5 54,6 14,3 1,90 2,40 1,23 7,75 12,3 5,47 1,85
10 11,66 9,15 0,246 41,1 64,9 17,3 1,88 2,36 1,22 9,39 14,6 6,36 1,93
4 5,570 4,37 0,275 26,4 41,8 11,0 2,18 2,74 1,40 5,14 8,44 4,17 1,86
5 6,876 5,40 0,275 32,2 51,1 13,3 2,16 2,73 1,39 6,32 10,3 4,95 1,91
7 70 6 8 8,160 6,41 0,275 37,8 59,9 15,6 2,15 2,71 1,38 7,48 12,1 5,67 1,95
7 9,424 7,40 0,275 43,1 68,4 17,8 2,14 2,69 1,38 8,59 13,8 6,34 1,99
8 10,67 8,37 0,274 48,2 76,4 20,0 2,12 2,68 1,37 9,68 15,4 6,98 2,03
5 7,412 5,82 0,295 40,0 63,3 16,6 2,33 2,92 1,50 7,32 11,9 5,77 2,04
6 8,797 6,91 0,294 47,0 74,4 19,5 2,31 2,90 1,49 8,64 14,0 6,67 2,07
7 10,16 7,98 0,294 53,6 85,0 22,2 2,30 2,89 1,48 9,93 16,0 7,44 2,11
7.5 75
8 11,50 9,03 0,294 60,0 95,1 24,9 2,28 2,88 1,47 11,2 17,9 8,19 2,15
9 12,83 10,1 0,294 66,1 105 27,5 2,27 2,86 1,46 12,4 19,8 8,89 2,18
10 9 14,13 11,1 0,293 72,0 114 30,1 2,26 2,84 1,46 13,6 21,5 9,56 2,22
5 7,912 6,21 0,315 48,8 77,3 20,3 2,48 3,13 1,60 8,34 13,7 6,66 2,15
6 9,397 7,38 0,314 57,4 91,0 23,7 2,47 3,11 1,59 9,87 16,1 7,65 2,19
7 10,86 8,53 0,314 65,6 104 27,1 2,46 3,10 1,58 11,4 18,4 8,58 2,23
8 80
8 12,30 9,66 0,314 73,5 117 30,4 2,44 3,08 1,57 12,8 20,6 9,46 2,27
9 13,73 10,8 0,314 81,1 129 33,6 2,43 3,06 1,56 14,3 22,7 10,3 2,31
10 15,13 11,9 0,313 88,4 140 36,8 2,42 3,04 1,56 15,6 24,8 11,1 2,35
6 10,64 8,35 0,354 82,8 131 34,3 2,79 3,51 1,80 12,6 20,6 9,95 2,44
7 12,30 9,66 0,354 94,8 150 39,2 2,78 3,50 1,78 14,5 23,6 11,2 2,48
8 13,94 10,9 0,353 106 169 44,0 2,76 3,48 1,78 16,4 26,6 12,4 2,52
9 90 10
9 15,57 12,2 0,353 118 187 48,7 2,75 3,46 1,77 18,3 29,4 13,5 2,56
10 17,17 13,5 0,353 129 204 53,3 2,74 3,45 1,76 20,1 32,0 14,5 2,59
12 20,31 15,9 0,352 149 236 62,2 2,71 3,41 1,75 23,6 37,1 16,5 2,67
NOTE The toe root radius r (r =1/3t) as shown in Figure 1 and the root radius r in this table are given only for information and for calculating the properties of the sections.
2 2 1
Table A.1 (continued)
Distance
of centre
Sectional
Surface 4 3
Dimensions, mm Moment of inertia, cm Radius of inertia, cm Modulus of section, cm
Section Mass,
of gravity
area,
area,
symbol kg/m
, cm
m /m
cm
B t r I I I i i i W W W C
1 x U V x U V x U V x
6 11,93 9,37 0,393 115 182 47,9 3,10 3,90 2,00 15,7 25,7 12,7 2,67
7 13,80 10,8 0,393 132 209 54,7 3,09 3,89 1,99 18,1 29,6 14,3 2,71
8 15,64 12,3 0,393 148 235 61,4 3,08 3,88 1,98 20,5 33,2 15,8 2,76
9 17,46 13,7 0,392 164 260 68,0 3,07 3,86 1,97 22,8 36,8 17,2 2,80
10 100 12
10 19,26 15,1 0,392 180 285 74,4 3,05 3,84 1,96 25,1 40,3 18,5 2,84
12 22,80 17,9 0,391 209 331 86,8 3,03 3,81 1,95 29,5 46,8 21,1 2,91
14 26,26 20,6 0,391 237 374 99,0 3,00 3,77 1,94 33,7 52,9 23,4 2,99
16 29,63 23,3 0,390 263 414 111 2,98 3,74 1,94 37,8 58,6 25,6 3,06
7 15,20 11,9 0,433 177 281 73,4 3,41 4,30 2,20 22,1 36,1 17,5 2,96
8 17,24 13,5 0,433 199 316 82,4 3,40 4,28 2,19 25,0 40,7 19,4 3,01
11 110 10 12 21,26 16,7 0,432 242 384 100 3,38 4,25 2,17 30,6 49,4 22,9 3,09
12 25,20 19,8 0,431 283 448 117 3,35 4,22 2,15 36,1 57,6 26,2 3,16
14 29,06 22,8 0,431 321 508 133 3,32 4,18 2,14 41,3 65,3 29,1 3,24
8 19,75 15,5 0,492 297 471 123 3,88 4,88 2,50 32,5 53,3 25,9 3,37
10 24,37 19,1 0,491 362 574 149 3,85 4,85 2,48 40,0 64,9 30,6 3,45
12.5 125 12 28,91 22,7 0,491 423 671 175 3,83 4,82 2,46 41,2 76,0 35,0 3,53
14 33,37 26,2 0,490 482 764 200 3,80 4,78 2,45 54,2 86,4 39,1 3,61
16 14 37,74 29,6 0,489 537 851 224 3,77 4,75 2,43 60,9 96,3 43,0 3,68
10 27,37 21,5 0,551 515 817 212 4,34 5,46 2,78 50,6 82,6 39,2 3,82
12 32,51 25,5 0,551 604 959 249 4,31 5,43 2,76 59,8 96,9 45,0 3,90
14 140
14 37,57 29,5 0,550 689 1 090 284 4,28 5,40 2,75 68,8 110 50,5 3,98
16 42,54 33,4 0,549 770 1 220 319 4,26 5,36 2,74 77,5 123 55,6 4,06
8 23,75 18,6 0,592 521 827 215 4,69 5,90 3,01 47,4 78,0 38,1 3,99
10 29,37 23,1 0,591 638 1 010 262 4,66 5,87 2,99 58,4 95,5 45,5 4,08
12 34,91 27,4 0,591 749 1 190 308 4,63 5,84 2,97 69,0 112 52,4 4,15
15 150
...