ISO 15072:2012

INTERNATIONAL ISO
STANDARD 15072
Second edition
2012-07-01

Hexagon bolts with flange with metric
fine pitch thread — Small series —
Product grade A
Vis à tête hexagonale à embase cylindro-tronconique, à filetage
métrique à pas fin — Série étroite — Grade A




Reference number
ISO 15072:2012(E)
©
ISO 2012

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ISO 15072:2012(E)

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ii © ISO 2012 – All rights reserved

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ISO 15072:2012(E)
Contents Page
Foreword . iv
1  Scope . 1
2  Normative references . 1
3  Dimensions . 2
4  Requirements and reference International Standards . 6
5  Designation . 6
Annex A (normative) Gauging of hexagon flange heads . 7
Bibliography . 9

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ISO 15072:2012(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 15072 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 11, Fasteners with
metric external thread.
This second edition cancels and replaces the first (ISO 15072:1999), of which it constitutes a minor revision.
It also incorporates the Technical Corrigendum ISO 15072:1999/Cor.1:2006.

iv © ISO 2012 – All rights reserved

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INTERNATIONAL STANDARD ISO 15072:2012(E)

Hexagon bolts with flange with metric fine pitch thread — Small
series — Product grade A
1 Scope
This International Standard specifies the characteristics of hexagon bolts with flange with metric fine pitch
thread, small series, with product grade A, and with nominal thread diameters from 8 mm up to and including
16 mm and property classes 8.8, 9.8, 10.9, 12.9/12.9 and A2-70.
If, in special cases, specifications other than those listed in this International Standard are required, they can
be selected from existing International Standards, for example ISO 261, ISO 888, ISO 898-1, ISO 965-2 and
ISO 3506-1.
2 Normative references
The following referenced documents are indispensable for the application 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 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions
ISO 261, ISO general purpose metric screw threads — General plan
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws
and studs with specified property classes — Coarse thread and fine pitch thread
ISO 965-2, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general
purpose external and internal screw threads — Medium quality
ISO 3269, Fasteners — Acceptance inspection
ISO 3506-1, Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and
studs
ISO 4042, Fasteners — Electroplated coatings
ISO 4753, Fasteners — Ends of parts with external ISO metric thread
ISO 4759-1, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C
ISO 6157-3, Fasteners — Surface discontinuities — Part 3: Bolts, screws and studs for special requirements
ISO 8992, Fasteners — General requirements for bolts, screws, studs and nuts
ISO 10683, Fasteners — Non-electrolytically applied zinc flake coatings
ISO 16048, Passivation of corrosion-resistant stainless-steel fasteners
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ISO 15072:2012(E)
3 Dimensions
See Figures 1 to 4 and Table 1.
Symbols and descriptions of dimensions are specified in ISO 225.

a
The top of the head shall be either full form or indented at the manufacturer's discretion and shall be either chamfered
or rounded. The minimum diameter of the chamfer circle or start of rounding shall be equal to the maximum width across
flats minus 15 %. If the top of the head is indented, the periphery may be rounded.
b
Edge contour is at the discretion of the manufacturer (optional).
c
Chamfered end, as specified in ISO 4753.
d
 = 15° to 30°.
e
k is the wrenching height; see the note to Table 1.
w
f
Incomplete thread u  2 P.
Figure 1 — Hexagon bolt with flange — Full shank — Standard type
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ISO 15072:2012(E)
Tolerances in millimetres

NOTE For other dimensions, see Figure 1.
a
Rounded, chamfered or conical.
b
d is approximately equal to the pitch diameter (rolling diameter).
2
Figure 2 — Hexagon bolt with flange — Reduced shank — Type R (upon request)

Type F without undercut — Standard type Type U with undercut (upon request or optional)
a
c is measured at d .
w,min
b
Maximum and minimum underhead fillet.
c
Junction of fillet with bearing surface shall be a smooth blend.
Figure 3 — Hexagon bolt with flange — Underhead configuration (bearing area)
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ISO 15072:2012(E)

Figure 4 — Hexagon bolt with flange threaded to the head
Table 1 — Dimensions
Dimensions in millimetres
Thread
M10  1 M12  1,25
b
M8  1 (M14  1,5) M16  1,5
a
M10  1,25 M12  1,5
(d  P )
max. 3,0 3,0 4,5 4,5 4,5
a
min. 1,0 1,0 1,5 1,5 1,5
c
22 26 30 34 38

b ref. d
28 32 36 40 44

e
– – – – 57

c min. 1,2 1,5 1,8 2,1 2,4
9,2 11,2 13,7 15,7 17,7
F
d Types
a max.
U
10,0 12,5 15,2 17,7 20,5
d max. 17,0 20,8 24,7 28,6 32,8
c
max. 8,00 10,00 12,00 14,00 16,00
d
s
min. 7,78 9,78 11,73 13,73 15,73
d
v max. 8,8 10,8 12,8 14,8 17,2
d min. 14,9 18,7 22,5 26,4 30,6
w
e min. 10,95 14,26 16,50 19,86 23,15
k max. 8,5 9,7 12,1 12,9 15,2
k
min. 3,8 4,3 5,4 5,6 6,8
w
l max. 2,1 2,1 2,1 2,1 3,2
f
r min. 0,4 0,4 0,6 0,6 0,6
1
f
max. 0,5 0,6 0,7 0,9 1,0
r
2
max. 0,36 0,45 0,54 0,63 0,72
r
3
min. 0,16 0,20 0,24 0,28 0,32
r ref. 5,7 5,7 5,7 5,7 8,8
4
max. 10,00 13,00 15,00 18,00 21,00
s
min. 9,78 12,73 14,73 17,73 20,67
max. 0,25 0,30 0,35 0,45 0,50
v
min. 0,10 0,15 0,15 0,20 0,25
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