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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. |