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By Authority Of
THE UNITED STATES OF AMERICA
Legally Binding Document
By the Authority Vested By Part 5 of the United States Code § 552(a) and
Part 1 of the Code of Regulations § 51 the attached document has been duly
INCORPORATED BY REFERENCE and shall be considered legally
binding upon all citizens and residents of the United States of America.
HEED THIS NOTICE
: Criminal penalties may apply for noncompliance.
Official Incorporator
:
T
HE
E
XECUTIVE
D
IRECTOR
OFFICE OF THE FEDERAL REGISTER
WASHINGTON, D.C.
Document Name:
CFR Section(s):
Standards Body:
e
Standard Specification for
CARBON STEEL
EXTERNALLY THREADED STANDARD
FASTENERS1
This standard is issued under the
flxed
designation A
307;
the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year oflast revision. A number in parentheses indicates the year oflast
reapproval.
'NOTE-Table 3, which was incorrectly retained at last revision, was editorially deleted and Table 4 renumbered to Table 3
in November 1979.
1. Scope
1.1 This specification
2
covers the chemical
and mechanical requirements of two grades of
carbon steel externally threaded standard fas­
teners, in sizes
1/4
in. (6.35 mm) through 4 in.
(104 mm). This specification does not cover
requirements for externally threaded fas­
teners having heads with slotted or recessed
drives or for mechanical expansion anchors.
The fasteners covered by this specification are
frequently used
for
the following applications:
1.1.1 Grade A Bolts,
for general applica­
tions, and
1.1.2 Grade B Bolts,
for flanged joints in
piping systems where one or both flanges are
cast iron.
1.2
If
no grade is specified in the inquiry,
contract, or order, Grade A bolts shall be
furnished.
.
1.3 NQnheaded anchor bolts, either straight
or bent, to be used for structural anchorage
purposes, shall conform to the requirements
of Specification A 36 with tension tests to be
made on the bolt body or on the bar stock
used for making the anchor bolts.
1.4
Suitable
nuts are covered in Specifica­
tion A 563. Unless otherwise specified, the
grade and style of nut for each grade of
fastener, of all surface finishes, shall be as
follows:
Fastener Grade and
'Size
A,
'/.
to
l'lz
in.
A, over
l'lz
to 4 in.
B,
'/.
to 4 in.
Nut Grade and
Style"
A, hex
A, heavy hex
A, heavy hex
"
Nuts of other grades and styles having specified proof
load stresses (Specification A 563, Table 3) greater than
the specified grade and style of nut are also suitable.
261
NOTE-The
values stated
in
inch-pound units are
to be regarded as the standard.
2. Applicable Documents
2.1 ASTM Standards:
A 36 Specification for
Structural SteeP
A 153 Specification for Zinc Coating (Hot­
Dip) on Iron and
Steel
Hardware
4
A
370
Methods and Definitions for Me­
chanical Testing of
Steel Products
7
A 563 Specification for Carbon and Alloy
Steel
Nuts
5
B 454 Specification for Mechanically De­
posited Coatings of Cadmium and Zinc
on Ferrous Metals
6
2.2 American National Standards:
8
ANSI
B 1.1 Unified
Screw
Threads
ANSI
BI8.2.1
Square
and Hex Bolts and
Screws
3.
Materials and Manufacture
3.1
Steel
for bolts shall be made by the
open-hearth, basic-oxygen, or electric-furnace.
process.
, This specification is under the jurisdiction of ASTM
Committee F-16 on Fasteners, and is the direct responsi­
bility of Subcommittee F
16.02
on Steel Bolting.
Current edition approved
Oct.
27, 1978. Published
December 1978. Originally published as A
307
- 47 T.
Last previous edition A
307
- 76 b.
2
For ASME Boiler and Pressure Vessel Code applica­
tions see related Specification
SA-307
in Section II of that
Code.
:l
Annual Book of
ASTM
Standards,
Part
4.
4
Annual Book of
ASTM
Standards,
Part
3.
5
Annual Book of
ASTM
Standards,
Parts
1
and 4.
"Annual
Book
ofASTM
Standards,
Parts
4 and 9.
1
Annual Book of
ASTM Standards, Parts
1, 2, 3,4,5,
and
10.
B
May be obtained from American National Standards
Institute, Inc.,
1430
Broadway, New
York,
N.
Y.10018.
3.2 Bolts may be produced by hot
or cold"
forging of the heads or machining from bar
stock.
3.3 Bolt threads may be rolled or cut.
3.4 When specified, galvanjzed bolts shall
be hot-dip zinc coated in accordance with the
requirements of Class C of Specification
A 153. When specified by the purchaser to be
mech~niCally galvari:izM,boIts~,o'yered
by this
specification shall be mechanically zinc coated
and the coating and coated fasteners shall
conform to the requirements for Class
50
of
,'$pecification
B
454.!<?{,tO
th~
poafingtpick-.
ness, adherence, and quality requirements for
Class C
pf
Specifica69~
A
153;
4. Chemical Requiremeuts
4.1
Steel
shall conform to the following
cheinicalreqJifenients:'
Phosphorus, max,
%
Sulfur, max,
%
.. ,',
Grade A
Bolts
. 0.06
0.15'
Grade B
Bolts
0 .. 04
0.05
4.2 Resulfurized material is not subject to
rejection
bas'ed onprodilct
analysis for sulfur.
4.3 Bolts are customarily furnished from
stock, in
which.case,
individual heats
of
steel
cannot
be identified.
4.4 Application of heats of steel to which
bismuth,
selenium, tellurium, or lead has
beendntentionally
added shall not be permit­
ted for Grade B bolts.
5. Mechanical Requirements
"'5.1
Bolts'shall
not'
exceed the maximum
hardness required in Table 1.
Bolts ress
than
three diameters in lepgth, or bolts with drilled
or undersize heads shall have hardness values
riot less
tllan.themiriimuriJ nbr'more
than the
maximum hardness limits required in Table 1,
as hardness is the only requirement.
5.2 Bolts
Pis
ip..
in
diall).eter
or less,
~ther
than those excepted in
4,.1
, shall
be
tested full
size and
shall conform
to
the reCjuireinentsf'or
tensile strength specified in Table 2.
5.3 Bolts larger
than
Pis
in. iIi
diameter,
other than those excepted
in 4,1
,shall pref­
erably be tested full
~ize
and when so tested,
shall conform to the requirements
for
tensile
strength specified in
:Table
2.
When
equip­
ment of sufficient
capacIty,for fuH-size
bolt
testing is not available, or when the
l~ngth
of
A
307.
the
baIt makes'
full-siz~testii1g
imprattical,
machined
sp'ecimens
shall be tested and
'shall
conform to the requirements shown below:
Tensile
Strength, ksi
(MPa)
Elonga­
tion in 2
in. or
50
mm,%
Gra~e
A,a.nd Gr;fdeBbolts
60
(4;15} min
18 min
GradeB bolts only
100 (690)
mme
In the
event
that baits are
tested'by
both full
size and by machine test
specimen
methods,
the full-size test shall govern if a controversy
between the two methods
e.xists ..
SAPoi'
Jjolts'oft'which'both
hardness and
tension tests are performed,
acceptance based
. on,tensile
;requirements
shall'take
precedence
in the event that there is
contrbversy bverlbW
readings of hardness tests.
6. Dimensions
6.1 Unless otherwise specified, threads
shall be
the
Coarse
Thread Series
as specified
in the
latest issue
of
ANSI
B 1.1,
having
a
Class 2A
tolerance. '
',.
~'.2
Unless otherwise
specifi~d, G~ade
A
bolts
shall
be hex
bolts
with
dimensions'
as
gtven
in
theiatestissue 'of ANSI
B 18.2.1.
Unless otherwise specified, Grade
B
boits
shall be
heavy
hex bolts
with
'dimensions as
given
in the
latestissue
of
ANSI
B
18.2~1.
6.3
Unless otherwise
specified, bolts to be
used with nuts or tapped holes which
have
been. tapped oversize,
111
accordance
,with
SpeCification
A 563,
shall have
Class 2A
threads before hot dip or mechanical
gaIYan­
izing.
After
galvanizing,
th6
ma~imum
limit
of
pitch
and
major diameter may
exceed the
Class 2A limit by
th~
following amount:
Diameter, in.
Up
to 7/16, inc!
Over
7/16
to
1,
inc!
Oved
Oversize Umit, in.
(mm)A
0.016 (0.41)
0.021 (0.53)
0.031 (0.79)
,\
These values are the' same as
the minimum'
overtap­
ping required for galvanized
i
riutsIn
Specification A
563.
6.4 The gaging limit for
b.olts
shall ;be
verified during manufacture or
,us~
by assem­
,bly.
of a nut
tapp!:d
as. nearly. as
Prflctical
to
the amount oversize shown above. In
case,pf
dispute, a calibrated thread ring .gage
of
that
same size (Class X tolerance, gage tolerance
plus),
shall be used. Asserhblyof the gage, or
the nut
described above,
must
be possible
. }Vith
hand effort
followipg
application of
l,ight
262
~~r~
A
307
machine oil to prevent galling and damage to
the gage. These inspections, when performed
to resolve disputes, shall be performed at the
frequency and quality described in Table 3.
7. Test Methods
7.1 The material shall be tested in accord­
ance with Supplement III of Methods and
A 370.
7.2 Standard square and hexagon bolts
only shall be tested by the wedge tension
method. Fracture shall be in the body or
threads of the bolt without any fracture at the
junction of the head and body.
Other
headed
boIts shall be tested by the axial tension
method.
7.3 Speed of testing as determined with a
free running crosshead shall be a maximum of
1 in. (25.4 mm )/min for the tensile strength
tests of bolts.
8. Number of Tests and Retests
8.1 The requirements of this specification
shall be met in continuous mass production
for stock, and the manufacturer shall make
sample inspections to ensure that the product
conforms to the specified requirements. Ad­
ditional tests of individual shipments of mate­
rial are not ordinarily contemplated. Individ­
ual heats of steel are not identified in the
finished product.
8.2 When specified in the order, the
m~lO­
ufacturer shall furnish a test report certified
to be the last completed set of mechanical
tests for each stock size in each shipment.
8.3 When additional tests are specified on
the purchase order, a lot, for purposes of
selecting test samples, shall consist of all
material offered for inspection at one time
that has the following common characteristics:
8.J.l One
type of item.
8.3.2
One
nominal size, and
8.3.3
One
nominal length of bolts.
8.4 From each lot, the number of tests for
each requirement shall be as follows:
263
Number of
Pieces
in Lot
800
and under
801
to 8
000
8
001
to 22
000
Over
22
000
Number of
Samples
1
2
3
5
8.5
If
any machined test specimen shows
defective machining it may be discarded and
another specimen substituted.
8.6 Should any sample fail to meet the
requirements of a specified test, double the
number of samples from the same lot shall be
tested, in
wiJich
case all of the additional
samples shall meet the specification.
9. Marking
9.1 Bolt heads shall be marked (by raised
or depressed mark at the option of the manu­
facturer) to identify the manufacturer. The
manufacturer may use additional marking for
his own use.
10.
Inspection
10.1 If the inspection described in 10.2 is
required by the purchaser it shall be specified
in the inquiry, order, or contract.
10.2 The inspector representing the pur­
chaser shall have free entry., at all times while
work on the contract of the purchaser is being
performed, to all parts of the manufacturer's
works that concern the manufacture of the
material ordered. The manufacturer shall af­
ford the inspector all reasonable facilities,
without charge, to satisfy him that the mate­
rial is being furnished in accordance with this
specification. All tests (except product analy­
sis) and inspection shall be made at the place
of manufacture prior to shipment, unless
oth­
erwise specified, and shall be so conducted as
not to interfere unnecessarily with the opera­
tion of the works.
11. Rejection
11.1 Unless otherwise specified, any rejec­
tion based on tests specified herein shall be
reported to the manufacturer within
30
work­
ing days from the
receipt
of samples by the
purchaser ..
TABLE
1
Hardness Requirements for Bolts
Hardness
Bolt
Size,
Grade Brinell RockweIlB
in.
min max min max
All A 121
241A
69
100
A
B 121
'
:212
69 95
A
Except when
te~ted
by wedge
terision
test.
T4BLE
2
TensiI.e
Req!lirements for
FuU-Size
Bolts
Tensile Strength, IbfB
Bolt
Threads
Stress
,
(}tade~
Grade;
Size,
per inch
Area
A
in.
in.
2
AandB,
Bo,,:,
min
c
rna
1/4
20 0.0318 1900
3
180
sit.
18
0.0524
3
100
5
240
3/
8 t"6 0.0775
4
650
7
750
71i.
14
0.1063 6'350 10 630
liz
13
0.1419
8
500
14
190
·It.
12
0.182
11
000
18
200
5/
8
11
0.226 J3,.5S0
?2
600
3/
4
10 0.334 20 050
33
400
7/S
\I
. ,0.462
27
700 46200
8
0.606
36
350 60 600
1'/8
7.
0.'763 45 800
76
300
1'/4 7
0.969 '58 150
<)6
900
1'/8
6
Ll-55 ' 69 300
115
500
1
liz
6
1.405
84
300 140 500
1'/4
5
1.90
114
000
'
190 000
2
4112
: ,2.50,
150'000 250 000
21t4, ' 4
1
/,;
,,3,25
195
000,
'
325 000
2
1
1z
"
4'
" 4.00
240 000
'
400 000
2
3
/4
"
..
'4;:·
,';;'4.93' 295800:
493
000
3
,4!'
5,97,
:j
,358 200
597
000
3i;~"
,
,4
7.10 426 000 710 '000
3
1
/z' '
4 8.33
499'800
; '833
000
,
,33/
4
'i"
,'4
"
JM6
;579.liOO
I'
4
,,.4-
}1.Q~
"
661aoo
J
,:A
'Area ;caiculated
frorn
the formula: "
As
=
0.7854
[D -
(O.9743/n)]' '
where:
As = stress
are~,
D
==
.noiniriaHliifme\er of'l:iolt; aild '
;d'!:
I
=;
,thr,elld~ ~,r
jnch.; /'
1
'
i' " "
,
HLlbf=4.,448N.",', "',
""'1,,"',
.;
c'~ase~lb'ri'66'1¥(41'4\MPa)':','"
P;:
'l"Baseildil:100,ksi (689'MPa)'.;,J
966
000
108
000
: I
II'
A
307
TABLJi:
3
sample S.izes
and Acceptance
Num!lers
for
Inspe,\jion
of Hot Dip or
l,\1echanically
Galvanized
Thr~.l!ds
Lot
Siz~
2
to
90
91 to
150
151 to
280
281 to
500
Salta
i
200
1
201
to 3
200
3
201
to
10 000
10 001
and over
S,ample
SizeA,
B
Acceptance
!,!umi:>er
A
13
20
32
50
80
125
200
315
i
2
3
5
7
10
14
21
A
Sample sizes of acceptance numbers are extracted
from
"Single
sampling
;Plan
for Normal
Inspection"
Table
IIA" MJL-STD-105D.
B
Inspect ,all bolts in the
lot
if the lot size is less than the
sample size ..
.
"
~
.'
1
)
, .'
~
i
II
;!ff;()j;
:'r
d1
'r ).
.
~
I!.
!
i
~
r: '. '(
The American Society for Testing and Materials takes no position respecting the validity of any patent
righ;;
'a~~erted
in
connection with any item mentioned in this standard. Users of this standard are expressly
adVised
that determination of the
validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.
This standard is subject to revision at any time by the
responSible
technical committee and must be reviewed every five
years and
if
not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or
for additional standards and should be addressed to ASTM Headquarters. Your comments will receive careful consideration
at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received
a fair hearing you should make your views known to the ASTM Committee on Standards,
1916
Race
St.,
Philadelphia, Pa.
19103, which will schedule a further hearing regarding your comments. Failing satisfaction there, you may appeal
to
the
ASTM Board of Directors.
264