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NAS1351C4-28

Socket Head Cap Screw

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Description

Fastener Length: 1-3/4", Thread: 1/4-28, Head Width: 3/16", Thread Length: 1", NAS1351 series screw

Specifications

Fastener Length 1.750
Hardness Rating 80.0 rockwell b minimum
Head Diameter 0.365 inches minimum and 0.375 inches maximum
Head Height 0.244 inches minimum and 0.250 inches maximum
Head Style Flat chamfer
Internal Drive Style Hexagon
Length 1 3/4
Material CRES
Material Specification 66 fed std all material responses
Min. Tensile Strength (psi) 80000 pounds per square inch
Minimum Yield Strength 30000 pounds per square inch
Surface Treatment Passivate
Surface Treatment Specification Qq-p-35 fed spec single treatment response
Thread Class 3a
Thread Diameter 0.250
Thread Direction Right-hand
Thread Length 1.000 inches minimum
Thread Qty 28
Thread Qty Per Inch (tpi) 28
Thread Series Designator UNF
Thread Size 1/4
Width Across Flats 0.188 inches minimum and 0.190 inches maximum

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Catalog data updated 2026-07-05. Report a data error