Bolt Markings
ASTM, SAE AND ISO GRADE MARKINGS AND MECHANICAL PROPERTIES FOR STEEL FASTENERS
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Item Name
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Fastener Class |
Material |
Nominal Size |
Mechanical Properties |
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Proof Load |
Yield Strength |
Tensile Strength |
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SAE J429 |
Bolts, |
Low or Medium Carbon Steel |
1/4 thru 1-1/2 |
33,000 |
36,000 |
60,000 |
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ASTM A307 |
Low Carbon Steel |
1/4 thru 4 |
— |
— |
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SAE J429 |
Low or Medium Carbon Steel |
1/4 thru 3/4 Over 3/4 to 1-1/2 |
55,000 |
57,000 |
74,000 |
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No |
SAE J429 |
Studs |
Medium Carbon Cold Drawn Steel |
1/4 thru 1-1/2 |
— |
100,000 |
115,000 |
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ASTM A193 |
AISI 501 |
1/4 Thru 4 |
— |
80,000 |
100,000 |
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ASTM A193 |
AISI 410 |
85,000 |
110,000 |
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ASTM A193 |
AISI 4140, 4142, OR 4105 |
1/4 thru 2-1/2 |
— |
105,000 |
125,000 |
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ASTM A193 |
CrMoVa Alloy Steel |
105,000 |
125,000 |
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ASTM A193 |
AISI 304 |
1/4 and larger |
— |
30,000 |
75,000 |
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ASTM A193 |
AISI 347 |
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ASTM A193 |
AISI 316 |
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ASTM A193 |
Bolts, |
AISI 321 |
1/4 and larger |
— |
30,000 |
75,000 |
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ASTM A193 |
AISI 304 |
1/4 thr 3/4 |
— |
100,000 |
125,000 |
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ASTM A193 |
AISI 347 |
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ASTM A193 |
AISI 316 |
95,000 |
110,000 |
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ASTM A193 |
AISI 321 |
100,000 |
125,000 |
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ASTM A320 |
Bolts, |
AISI 4140, |
1/4 thru 2-1/2 |
— |
105,000 |
125,000 |
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ASTM A320 |
AISI 4037 |
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ASTM A320 |
AISI 4137 |
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ASTM A320 |
AISI 8740 |
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ASTM A320 |
AISI 4340 |
1/4 thru 4 |
— |
105,000 |
125,000 |
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ASTM A320 |
Bolts, |
AISI 304 |
1/4 and larger |
— |
30,000 |
75,000 |
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ASTM A320 |
AISI 347 |
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ASTM A320 |
AISI 321 |
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ASTM A320 |
AISI 303 |
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ASTM A320 |
AISI 316 |
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ASTM A320 |
AISI 304 |
1/4 thru 3/4 |
— |
100,000 |
100,000 |
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ASTM A320 |
AISI 347 |
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ASTM A320 |
AISI 303 |
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ASTM A320 |
AISI 316 |
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ASTM A320 |
AISI 321 |
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SAE J429 |
Bolts, |
Medium Carbon Steel, Quenched and Tempered |
1/4 thru 1 |
85,000 |
92,000 |
120,000 |
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ASTM A449 |
1/4 thru 1 |
85,000 |
92,000 |
120,000 |
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SAE J429 |
Sems |
Low or Medium Carbon Steel, Quenched and Tempered |
No. 6 |
85,000 |
— |
120,000 |
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SAE J429 |
Bolts, |
Low Carbon Martensitic Steel, Quenched and Tempered |
1/4 thru 1 |
85,000 |
92,000 |
120,000 |
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ASTM A325 |
High Strength |
Medium Carbon Steel, Quenched and Tempered |
1/2 thru 1 |
85,000 |
92,000 |
120,000 |
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ASTM A325 |
Low Carbon Martensitic Steel, Quenched and Tempered |
1/2 thru 1 |
85,000 |
92,000 |
120,000 |
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ASTM A325 |
Atmospheric Corrosion Resisting Steel, Quenched and Tempered |
1/2 thru 1 |
85,000 |
92,000 |
120,000 |
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ASTM A354 |
Bolts, |
Alloy Steel, Quenched and Tempered |
1/4 thru 2-1/2 |
80,000 |
83,000 |
105,000 |
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ASTM A354 |
105,000 |
109,000 |
125,000 |
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SAE J429 |
Bolts, |
Medium Carbon Alloy Steel, Quenched and Tempered 4 |
1/4 thru 1-1/2 |
105,000 |
115,000 |
133,000 |
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SAE J429 |
Bolts, |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/4 thru 1-1/2 |
120,000 |
130,000 |
150,000 |
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ASTM A354 |
Alloy Steel, Quenched and Tempered 4 |
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SAE J429 |
Studs |
Medium Carbon Alloy or SAE 1041 Modified Elevated Temperature Drawn Steel |
1/4 thru 1-1/2 |
120,000 |
130,000 |
150,000 |
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ASTM A490 |
High Strength Structural Bolts |
Alloy Steel, Quenched and Tempered |
1/2 thru 1-1/2 |
120,000 |
130,000 |
150,000 min |
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No Grade |
ISO R898 |
Bolts, |
Medium Carbon Steel, Quenched and Tempered |
All Sizes |
33,000 |
36,000 |
60,000 |
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ISO R898 |
55,000 |
57,000 |
74,000 |
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8.8 |
ISO R898 |
Alloy Steel, Quenched and Tempered |
85,000 |
92,000 |
120,000 |
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10.9 |
ISO R898 |
120,000 |
130,000 |
150,000 |
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FASTENER IDENTIFICATION MARKING
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Grade |
Item Name |
Material |
Nominal Size |
Proof |
Hardness |
See |
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Min |
Max |
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ASTM A563 – Grade 0 |
Carbon Steel |
1/4 thru 1-1/2 |
69 |
B55 |
C32 |
3,4 |
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ASTM A563 – Grade A |
Carbon Steel |
1/4 thru 1-1/2 |
90 |
B68 |
C32 |
3,4 |
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ASTM A563 – Grade B |
Carbon Steel |
1/4 thru 1 |
120 |
B69 |
C32 |
3,4 |
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over 1 thru 1-1/2 |
105 |
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ASTM A563 – Grade C |
Carbon Steel |
1/4 thru 4 |
144 |
B78 |
C38 |
5 |
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ASTM A563 – Grade C3 |
Corrosion |
1/4 thru 4 |
144 |
B78 |
C38 |
5,9 |
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ASTM A563 – Grade D |
Carbon Steel |
1/4 thru 4 |
150 |
B84 |
C38 |
6 |
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ASTM A563 – Grade DH |
Carbon Steel |
1/4 thru 4 |
175 |
C24 |
C38 |
6 |
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ASTM A563 – Grade DH3 |
Corrosion |
1/4 thru 4 |
175 |
C24 |
C38 |
5,9 |
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ASTM A194 – Grade 1 |
Carbon Steel |
1/4 thru 4 |
130 |
B70 |
— |
7 |
 |
ASTM A194 – Grade 2 |
Medium Carbon |
1/4 thru 4 |
150 |
159 |
352 |
7,8 |
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ASTM A194 – Grade 2H |
Medium Carbon |
1/4 thru 4 |
175 |
C24 |
C38 |
7 |
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ASTM A194 – Grade 2HM |
Medium Carbon |
1/4 thru 4 |
150 |
159 |
237 |
7,8 |
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ASTM A194 – Grade 4 |
Medium Carbon |
1/4 thru 4 |
175 |
C24 |
C38 |
7 |
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ASTM A194 – Grade 7 |
Medium Carbon |
1/4 thru 4 |
175 |
C24 |
C38 |
7 |
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ASTM A194 – Grade 7M |
Medium Carbon |
1/4 thru 4 |
150 |
159 |
237 |
7 |
