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ASTM,
SAE AND ISO GRADE MARKINGS AND MECHANICAL PROPERTIES FOR STEEL FASTENERS
NOTE:
A
manufacturer marking
indicates the company that manufactured the fastener.
The
strength class
consists of two numbers separated by a decimal point. Common classes
are 4.8, 8.8, 10.9, and 12.9. The number of the left indicates 1%
of the tensile strength in MPa, or N/mm2. The number
on the right indicates the proportion of the yield strength in relation
to the tensile strength.
Manufacturer
and/or Fastener Supplier or Distributor Identification Markings
These are
symbols unique to the manufacturer to self-identify the fasteners
they produce for the purpose of positively identifying the fastener
supplying company that accepts the responsibility that the fastener
is within the requirements of the engineering standard against which
it was manufactured. In effect, the marking says “we are the company
guaranteeing this fastener to be correct; if it is found non-conforming,
we are accountable."
Reputable
North American fastener supplying companies are knowledgeable on
the contents of the various engineering standards. They understand
the technical requirements and are diligent in their compliance,
and they appreciate the risks and exposures associated with nonconformity.
Any solicitation
to purchase fasteners which the engineering standards require to
be manufacturer identified, and which are not, should be viewed
with suspicion. The economics may appear attractive, but in no way
will the savings compensate for non-traceability and the ongoing
risk of a liability exposure.
FASTENER IDENTIFICATION MARKING
|
DESC
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DIM SPECS
|
MECH PROP
|
MATERIAL
|
SIZE
|
TENSILE (MinPSI)
|
PROOF
LOAD
(PSI)
|
|
Gr. A307
Hex Bolt
|
ANSI B18.2.1
Table 2
|
ASTM A307 Grade A
|
Low Carbon Steel
|
All
|
60000
|
N/R
|
|
Gr. 5 Cap Screw
NC import
|
ANSI B18.2.1
Table 4
|
SAE J429 Grade 5
|
Med Carbon steel
|
1/4 to 1
|
120,000 105,000
|
85,000
74,000
|
|
Gr. 5 Cap Screw
NF import
|
ANSI B18.2.1 Table 4
|
SAE J429 Grade 5
|
Med Carbon steel
|
1/4 to 1
|
120,000 150,000
|
85,000
74,000
|
|
Gr. A307
Carriage Bolt
|
ASME B18.5
Table 2
|
ASTM A307 Grade A
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Low Carbon Steel
|
1/4 to 3/4
|
60,000
|
N/R
|
|
Hex Head
Lag Screw
|
ANSI B18.2.1 Table 9
|
SAE J429 Grade 1
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Low Carbon Steel
|
1/4 to 3/4
|
|
|
|
All Thread
Rod, NC
|
N/A
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ASTM A307 Grade A
|
Low Carbon Steel
|
All
|
60,000
|
N/R
|
|
All Thread
Rod, NF
|
N/A
|
ASTM A307 Grade A
|
Low Carbon Steel
|
All
|
60,000
|
N/R
|
|
All Thread
Rod, NC Left
Hand Thread
|
N/A
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ASTM A307 Grade A
|
Low Carbon Steel
|
All
|
60,000
|
N/R
|
|
Gr. A / 2 Hex
Nut, NC (plain
and zinc Plated)
|
ASME / ANSI B18.2.2
Table 3
|
ASTM A563 Gr. A & SAE J995
Grade 2
|
Low Carbon Steel
|
1/4 to 1 1/2 Over 1 1/2
|
N/A
|
90,000
N/R
|
|
Gr. A Hex
Nut- HDG
|
AS B18.2 -
1955
|
ASTM A536
Grade A
|
Low Carbon Steel
|
1/4 to 1 1/2 Over 1 1/2
|
N/A
|
68,000
N/R
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Gr. 2 Hex
Jam Nut, NC
|
ASME / ANSI B18.2.2
Table 3
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SAE J995 Grade 2
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Low Carbon Steel
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All
|
N/A
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N/R
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Gr. 5 Hex
Nut , NC
|
ASME / ANSI B18.2.2
Table 3
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SAE J995 Grade 5
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Low Carbon Steel
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1/4 to 1 1 1/8 to 1 1/2
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N/A
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120,000
105,000
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|
Gr. A Hvy Hex
Nut, NC Gr. A
Hvy Hex Nut - HDG
Gr. A Hvy Hex
Nut, NC
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ASME / ANSI B18.2.2
Table 9
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ASTM A536 Gr. A
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Low Carbon Steel
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1/4 to 1 1/2 1/4 to 1 3/4 Over 1 1/2
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N/A
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100,000
75,000
N/R
|
|
Gr. 2H Heavy
Hex Nut, UNC & UN
(8 Series thread, 1"
and over)
|
ASME / ANSI B18.2.2
Table 9
|
ASTM A194 Gr. 2H
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Med Carbon steel
|
3/8 to 1 1 1/8 to 1 1/2
over 1 1/2
|
N/A
|
175,000
N/R
N/R
|
|
Gr. 2H Heavy
Hex Nut, UNC (1 1/8-7
thru 2 3/4-4)
|
ASME / ANSI B18.2.2
Table 9
|
ASTM A194 Gr. 2H
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Med Carbon steel
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3/8 to 1 1 1/8 to 1 1/2
over 1 1/2
|
N/A
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175,000
N/R
N/R
|
|
Hex Machine
Screw Nut, NC & NF
|
ANSI B18.6.3 Table 51
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None
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Low Carbon Steel
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#2 to 3/8 10-32
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N/A
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N/R
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Hex Coupling Nut, Reducer, NC
|
None
|
ASTM A536 Gr. A
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Low Carbon Steel
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All
|
N/A
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90,000
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Hex Coupling Nut, Economy, NC
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None
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ASTM A536 Gr. A
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Low Carbon Steel
|
All
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N/A
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90,000
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Hex Coupling Nut, Regular, NC
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None
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ASTM A536 Gr. A
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Low Carbon Steel
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All
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N/A
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90,000
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Hex Nut Gr. 8,
NC (import)
|
ASME / ANSI B18.2.2
Table 3
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SAE J995 Grade 8
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Med Carbon steel
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1/4 to 5/8 3/4 to 1 1
1/8 to 1 1/2
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N/A
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150,000
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|
Nylon Insert Locknut, NC
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IFI 100/107 Except Across flats
|
IFI 100/107
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Low Carbon Steel
|
#4 to 1 1/2
|
N/A
|
90,000
|
|
Nylon Insert Locknut, NF
|
IFI 100/107 Except Across flats
|
IFI 100/107
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Low Carbon Steel
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#4 to 1 1/2
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N/A
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90,000
|
|
Wing Nut, NC (Cold Forged)
|
USAS B18.17 Type A
Table 1
|
None
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Low Carbon Steel
|
All
|
N/A
|
N/A
|
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Acorn Nut
( 2 piece)
|
SAE J483 (Low crown)
|
None
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Low Carbon Steel
|
All
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N/A
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N/A
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Split
Lockwasher
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ASME B18.21.1 Table 2
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ASME B18.21.1
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1055 to 1065 or equivalent
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All
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N/A
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N/A
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Cut Washer
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ANSI B18.22.1 Table 1A, Size W
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ASTM F844
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Steel
|
All
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N/A
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N/A
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SAE Washer
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ANSI B18.22.1 Table 1A,
Size N
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ASTM F844
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Steel
|
All
|
N/A
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N/A
|
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Fender Washer
|
None (thickness .051-.080)
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ASTM F844
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Steel
|
All
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N/A
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N/A
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F436 Hardened Round Washer
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ASTM F436
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ASTM F436
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Steel
|
All
|
N/A
|
N/A
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Alloy B7 All
Thread Rod, NC
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None
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ASTM A193 Grade B7
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Chrome-Moly Steel 4140, 4142, 4145, 4140H, 4142H,
4145H
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up to 2 1/2
|
125,000
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N/A
|
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Alloy B7 All
Thread Rod, 8
Pitch
|
None
|
ASTM A193 Grade B7
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Chrome-Moly Steel 4140, 4142, 4145, 4140H, 4142H,
4145H
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up to 2 1/2
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125,000
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N/A
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Additional Information:
In addition to
the indicated grade marking, all grades, except A563 grades O, A
and B, must be marked for manufacturer identification.
The markings
shown for all grades of A194 nuts are for cold formed and hot forged
nuts. When nuts are machined from bar stock the nut must be additionally
marked with the letter 'B'.
Nuts are not
required to be marked unless specified by the purchaser. When marked,
the identification marking shall be the grade letter O, A or B.
Properties shown
are those of non-plated or non-coated coarse thread hex nuts.
Properties shown
are those of coarse thread heavy hex nuts.
Properties shown
are those of coarse thread heavy hex nuts.
Properties shown
are those of coarse 8-pitch thread heavy hex nuts.
Hardness’s are
Brinell Hardness Numbers.
The nut manufacturer,
at his option, may add other markings to indicate the use of atmospheric
corrosion resistant steel.
Specifications
(ASTM A563) Carbon and Alloy Steel Nuts. (ASTM A194/A194M) Carbon
and Alloy Steel Nuts for Bolts for High Pressure and High Temperature
Service.
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Disclaimer:
The information contained in this publication is intended
for general information purposes only. This publication is not a
substitute for review of the applicable government regulations and
standards, and should not be construed as legal advice or opinion.
Readers with specific questions should refer to the cited regulation
or consult with an attorney.
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