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| Home > Bolts > Grade 8 Hex Head Cap Screws |
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Grade 8 Hex Head Cap Screws
Medium Carbon Alloy Heat Treated Steel
Coarse (USS) & Fine (SAE) Thread
Yellow Zinc Plated
Made in the U.S.A.*
*occasional stock fill with Canadian manufactured product
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Head Markings |
Grade or Class |
Material |
Nominal Size Range
(Inches) |
Mechanical Properties |
|
Proof Load (psi) |
Minimum Yield Strength (psi) |
Minimum Tensile Strength (psi) |
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American Bolts |
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6 Radial Lines
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Grade 8 |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/4 thru 1-1/2 |
120,000 |
130,000 |
150,000 |
Core Hardness
1/4 through 1-1/2 in. diameter, all lengths: Rockwell C33 - C39.
Surface Hardness
1/4 through 1-1/2 in. diameter, all lengths: Rockwell 30N58.6 maximum.
Proof Load
1/4 through 1-1/2 in. diameter, all lengths: 120,000 psi.
Yield Strength
1/4 through 1-1/2 in. diameter, all lengths: 130,000 psi. minimum.
Tensile Strength
1/4 through 1-1/2 in. diameter, all lengths: 150,000 psi. minimum.
The length of a cap screw is measured from
the under head 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 8 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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