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Guide to Fastener Materials


Note: Steel low-carbon is generally the default steel selection when no other steel grade is specified, or when no higher grade steel is required. Please check your application needs if you are not certain.

Mechanical Guidelines for Fasteners - Screws, Nuts, Bolts, Washers, Pins

Steel Grade
Material & Treatment
Proof Load Stress
Yield Strength
Tensile Strength
Core Hardness, Rockwell
Standards Authority
ksi (1000 lbs/sq inch) Min.
ksi (1000 lbs/sq inch) Min.
ksi (1000 lbs/sq inch) Min.
Low-carbon grade 2
Low/medium carbon steel, cold-forged
55
57
74
B70-B100
Society of Automotive Engineers
Grade A
Low/medium carbon steel
90-100
95-105
60
B69-B100
American Society for Testing & Materials
Grade B
Low/medium carbon steel
70-133
76-139
60-100
B69-B95
American Society for Testing & Materials
Grade 5
Medium carbon steel, quenched & tempered
74-85
81-82
105-120
C19-C34
Society of Automotive Engineers
Grade 8
Medium carbon alloy steel, quenched & tempered
120
130
150
C33-C39
Society of Automotive Engineers
Grade C
Medium carbon steel
144
154
N/A
B78-C38
American Society for Testing & Materials
2-H
Medium carbon steel
144
154
N/A
B78-C38
Society of Automotive Engineers
Strength guidelines may vary by part thickness, number of threads/inch, finish, and other design or production factors.

InStock Fasteners publishes this list to serve as a guideline to the materials we market. InStock Fasteners makes no warranty of any kind as to the certification of parts sold meeting these specifications.

 

 

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