McMaster 91251A242 Black-Oxide Alloy Steel Socket Head Screw 10-24 Thread Size, 1/2" Long PK100
Made of alloy steel, these screws are the standard for high-strength fastening. Use them in high-load applications such as dies, presses, and heavy equipment. The deep, six-point socket keeps the hex key from slipping out and damaging the drive.
Length is measured from under the head.
Black-Oxide Alloy Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
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Thread
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|
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Size
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10-24 |
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Spacing
|
Coarse |
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Type
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UNRC |
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Fit
|
Unified Standard Class 3A |
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Direction
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Right Hand |
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Socket Head Profile
|
Standard |
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Fastener Head Type
|
Socket |
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Drive Style
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Hex |
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Length
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1/2" |
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Head
|
|
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Diameter
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5/16" |
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Height
|
0.19" |
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Threading
|
Fully Threaded |
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Tensile Strength
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170,000 psi |
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Specifications Met
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ASTM A574 |
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Certificate Form
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Digital |
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Certificate Type
|
Material Certificate with Traceable Lot Number |
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Drive Size
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5/32" |
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Hardness
|
Rockwell C37 |
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Material
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Black-Oxide Alloy Steel |
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Performance
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High Strength |
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Screw Size Decimal Equivalent
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0.19" |
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System of Measurement
|
Inch |
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Tip Type
|
Flat |
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Country of Origin
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United States |
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DFARS Compliance
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Specialty Metals Compliant (252.225-7009) |
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Export Control Classification Number (ECCN)
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EAR99 |
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REACH Compliance
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REACH (EC 1907/2006) (02/04/2026, 253 SVHC) Compliant |
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RoHS Compliance
|
RoHS 3 (2015/863/EU) Compliant |
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Schedule B Number
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731815.9000 |
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U.S.–Mexico–Canada Agreement (USMCA) Qualifying
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Yes |