Grade 5 Hex Head Cap Screws
Medium Carbon Heat Treated Steel
Coarse (USS) & Fine (SAE) Thread
Zinc Plated .
|
Head Markings |
Grade or Class |
Material |
Nominal Size Range
(Inches) |
Mechanical Properties |
|
Proof Load (psi) |
Minimum Yield Strength (psi) |
Minimum Tensile Strength (psi) |
|
American Bolts |
|
3 Radial Lines
|
Grade 5 |
Medium Carbon Steel, Quenched and Tempered |
1/4 thru 1 |
85,000 |
92,000 |
120,000 |
|
Over 1 thru 1-1/2 |
74,000 |
81,000 |
105,000 |
Core Hardness1/4 through 1 in. diameter, all lengths: Rockwell C25 - C34.
1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell C19 - C30.
Surface Hardness
1/4 through 1 in. diameter, all lengths: Rockwell 30N54 maximum.
1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell 30N50 maximum.
Proof Load
1/4 through 1 in. diameter, all lengths: 85,000 psi.
1-1/8 through 1-1/2 in. diameter, all lengths: 74,000 psi.
Yield Strength
1/4 through 1 in. diameter, all lengths: 92,000 psi. minimum.
1-1/8 through 1-1/2 in. diameter, all lengths: 81,000 psi. minimum.
Tensile Strength
1/4 through 1 in. diameter, all lengths: 120,000 psi. minimum.
1-1/8 through 1-1/2 in. diameter, all lengths: 105,000 psi. minimum.
The length of a cap screw is measured from
the underhead bearing surface to the extreme end of the screw
Helpful Hint to Remember...
Formula to find the length of thread on a Hex Head Cap Screw:
Twice the Diameter plus 1/2" (2D+1/2)
example: A 3/8-16 x 5" Grade 5 Hex Head Cap Screw has 1-1/4" of Thread (2 times 3/8" plus 1/2") and 3-3/4" of Plain Shank ( 5" minus 1-1/4" equal 3-3/4") under the Head.
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