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You are here: Home / Bent Bolts / Bolt Strength Requirements by Grade

Bolt Strength Requirements by Grade

September 30, 2021 By Birmingham Fastener

This chart detailed bolt strength requirements by grade. All specifications below are per ASTM. For more information on fasteners, visit our Fastener Learning Hub.

Bolt Strength Requirement By Grade Chart

Specification Material Nominal Size (Inches) Proof Load Min (ksi) Strength Min (ksi) Hardness Min Hardness Max
A307 Grade A Low or Medium Carbon Steel 1/4″ to 4″ – 60 B69 B100
A307 Grade B Low or Medium Carbon Steel 1/4″ to 4″ – 60 min
100 max
B69 B95
F1554 Grade 36 Low or Medium Carbon Steel 1/4″ to 4″ – 58 min
80 max
– –
F1554 Grade 55 Low or Medium Carbon Steel 1/4″ to 2″
2-1/4″ to 2-1/2″
2-3/4″ to 3″
3-3/4″ to 4″
– 75 min
95 max
– –
F1554 Grade 105 Medium Carbon Alloy Steel,
Q & T
1/4″ to 3″ – 125 min
150 max
– –
A193/A320
Grade B8
AISI SS304
Stainless
All Included
No Restrictions
– 75 – B96
A193/A320
Grade B8M
AISI SS316
Stainless
All Included
No Restrictions
– 75 – B96
F3125 Grade A325
Type 1
Medium Carbon Steel
Q & T
1/2″ to 1″ 85 120 C25 C34
F3125 Grade  A325
Type 3
Atomspheric Corrosion
Resistant Steel, Q & T
1-1/8″ to 1-1/2″ 74 105 C19 C30
A449
Type 1 or 3
Medium Carbon Steel
Q & T
1-1/4″ to 1″
1-1/8″ to 1-1/2″
1-5/8″ to 3″
85
74
55
120
105
90
C25
C19
B91
C34
C30
B100
A193
Grade B7
Medium Carbon
Alloy Steel, Q & T
1/4″ to 2-1/2″
2-5/8″ to 4″
4-1/8″ to 7″
– 125
115
100
– C35
C35
C35
A193
Grade B7M
ANSI 4140,
4142, or 4145
1/4″ to 2-1/2″ – 125 – –
A354
Grade BC
Medium Carbon
Alloy Steel, Q & T
1/4″ to 2-1/2″
2-5/8″ to 4″
105
95
125
115
C26
C22
C36
C33
F3125 Grade A490
Type 1
Medium Carbon
Alloy Steel,
Q & T
1/2″ to 1″ 120 150 min
173 max
C33 C38
F3125 Grade A490
Type 3
Atmospheric Corrosion
Resistant Steel,
Q & T
1/2″ to 1-1/2″ 120 150 min
173 max
C33 C38
A354
Grade BD
Medium Carbon
Alloy Steel,
Q & T
1/4″ to 2-1/2″
2-5/8″ to 4″
120
105
150
140
C3
C313
C39
C39

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Filed Under: Bent Bolts, manufacturing, metal building, Structural Bolting

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