American Fastener - ASTM, SAE, and ISO Grade Markings Bolt Specification
American Fastener - ASTM, SAE, and ISO Grade Markings Bolt Specification
American Fastener - ASTM, SAE, and ISO Grade Markings Bolt Specification
http://www.americanfastener.com/technical/grade_markings_steel.asp
ASTM, SAE AND ISO GRADE MARKINGS AND MECHANICAL PROPERTIES FOR STEEL FASTENERS
Identification Specification Grade Mark SAE J429 Grade 1 ASTM A307 Grades A&B No Grade Mark SAE J429 Grade 2 Bolts, Screws, Studs Fastener Description Material Nominal Size Range (in.) 1/4 thru 1-1/2 1/4 thru 4 1/4 thru 3/4 Over 3/4 to 1-1/2 Mechanical Properties Proof Load (psi) 33,000 -Yield Tensile Strength Strength Min (psi) Min (psi) 36,000 60,000 --
Low or Medium Carbon Steel Low Carbon Steel Low or Medium Carbon Steel
55,000 33,000
57,000 36,000
74,000 60,000
No Grade Mark
Studs
--
100,000
115,000
AISI 501
1/4 Thru 4
--
80,000
100,000
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ASTM A193 Grade B6 B6 ASTM A193 Grade B7 B7 ASTM A193 Grade B16 B16 ASTM A193 Grade B8 B8 ASTM A193 Grade B8C B8C ASTM A193 Grade B8M B8M ASTM A193 Grade B8T B8T ASTM A193 Grade B8 B8 ASTM A193 Grade B8C B8C ASTM A193 Grade B8M B8M
AISI 410
85,000
110,000
----
AISI 304
AISI 347
--
30,000
75,000
AISI 316
AISI 321
--
30,000
75,000
1/4 thr 3/4 Over 3/4 thru 1 AISI 347 Over 1 Strain Hardened thru 1-1/4 Over 1-1/4 thru AISI 316 1-1/2 Strain Hardened
-----
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ASTM A193 Grade B8T B8T ASTM A320 Grade L7 L7 ASTM A320 Grade L7A L7A ASTM A320 Grade L7B L7B ASTM A320 Grade LC7 L7C ASTM A320 Grade L43 L43 ASTM A320 Grade B8 B8 ASTM A320 Grade B8C B8C ASTM A320 Grade B8T B8T ASTM A320 Grade B8F B8F Bolts, Screws, Studs for Low-Temperature Service Bolts, Screws, Studs for Low-Temperature Service
AISI 8740
AISI 4340
1/4 thru 4
--
105,000
125,000
AISI 304
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ASTM A320 Grade B8M B8M ASTM A320 Grade B8 B8 ASTM A320 Grade B8C B8C ASTM A320 Grade B8F B8F ASTM A320 Grade B8M B8M ASTM A320 Grade B8T B8T SAE J429 Grade 5 Bolts, Screws, Studs
AISI 316
AISI 304
AISI 347
AISI 316
1/4 thru 3/4 Over 3/4 thru 1 Over 1 thru 1-1/4 Over 1-1/4 thru 1-1/2
-----
AISI 321 1/4 thru 1 85,000 Over 1 to 74,000 1-1/2 Medium Carbon 1/4 thru 1 Steel, Quenched Over 1 to 85,000 and Tempered 1-1/2 74,000 Over 55,000 1-1/2 thru 3 Low or Medium Carbon Steel, Quenched and Tempered No. 6 thru 3/8
92,000 81,000
120,000 105,000
ASTM A449
Sems
85,000
--
120,000
92,000
120,000
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Tempered ASTM A325 Type 1 A325 ASTM A325 Type 2 A325 Medium Carbon 1/2 thru 1 85,000 Steel, Quenched 1-1/8 thru 74,000 and Tempered 1-1/2 Low Carbon Martensitic Steel, 1/2 thru 1 85,000 Quenched and Tempered Atmospheric Corrosion Resisting Steel, Quenched and Tempered 1/2 thru 1 85,000 1-1/8 thru 74,000 1-1/2 92,000 81,000 120,000 105,000
92,000
120,000
92,000 81,000
120,000 105,000
ASTM A354 Grade BB BB ASTM A354 Grade BC BC SAE J429 Grade 7 Bolts, Screws, Bolts, Studs
80,000 83,000 1/4 thru 75,000 78,000 2-1/2 2-3/4 thru 4 105,000 109,000 95,000 99,000
105,000 100,000
125,000 115,000
Medium Carbon Alloy Steel, Quenched and Tempered 4 Medium Carbon Alloy Steel, Quenched and Tempered Alloy Steel, Quenched and Tempered 4 Medium Carbon Alloy or SAE 1041 Modified Elevated Temperature Drawn Steel
105,000 115,000
133,000
120,000 130,000
150,000
No Grade Mark
Studs
120,000 130,000
150,000
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120,000 130,000
No Grade Mark
ISO R898 Class 4.6 Medium Carbon Steel, Quenched and Tempered ISO R898 Class 5.8
33,000
36,000
60,000
55,000
57,000
74,000
or
92,000
120,000
88 10.9
or
120,000 130,000
150,000
109
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Marking ASTM A563 - Grade 0 ASTM A563 - Grade A No Mark ASTM A563 - Grade B Carbon Steel Carbon Steel Carbon Steel Carbon Steel May be Quenched and Tampered Atmospheric Corrosion Resistant Steel May be Quenched and Tampered Carbon Steel May be Quenched and Tampered Carbon Steel Quenched and Tampered Atmospheric Corrosion Resistant Steel, Quenched and Tampered Carbon Steel Medium Carbon Steel 1/4 thru 1-1/2 1/4 thru 1-1/2 1/4 thru 1 over 1 thru 1-1/2
Stress ksi Min Max 69 90 120 105 B69 C32 3,4 B55 C32 3,4 B68 C32 3,4
1/4 thru 4
144
B78 C38
1/4 thru 4
144
1/4 thru 4
150
B84 C38
1/4 thru 4
175
C24 C38
1/4 thru 4
175
1/4 thru 4
130
B70
--
1/4 thru 4
150
159 352
7,8
1/4 thru 4
175
C24 C38
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Medium Carbon Steel, Quenched and Tempered Medium Carbon Alloy Steel, Quenched and Tempered Medium Carbon Alloy Steel, Quenched and Tempered Medium Carbon Alloy Steel, Quenched and Tempered
1/4 thru 4
150
159 237
7,8
1/4 thru 4
175
C24 C38
1/4 thru 4
175
C24 C38
1/4 thru 4
150
159 237
10
1. In addition to the indicated grade marking, all grades, except A563 grades O, A and B, must be marked for manufacturer identification. 2. 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'. 3. 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. 4. Properties shown are those of nonplated or noncoated coarse thread hex nuts. 5. Properties shown are those of coarse thread heavy hex nuts. 6. Properties shown are those of coarse thread heavy hex nuts. 7. Properties shown are those of coarse 8-pitch thread heavy hex nuts. 8. Hardnesses are Brinell Hardness Numbers. 9. The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel. 10. 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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