Part Number NAS1581C4R4 Close Tolerance Screw
SKU: 5305012208681Product Features
Internal drive ribbed
NAS1581C4R4 Close Tolerance Screw Datasheet
National aerospace standards part number NAS1581C4R4
Thread Direction:
Right-hand
Thread Length:
Between 0.378 inches and 0.428 inches
Fastener Length:
Between 0.638 inches and 0.668 inches
Head Style:
Flat countersunk
Head Diameter:
Between 0.3504 inches and 0.3988 inches
Grip Diameter:
Between 0.2485 inches and 0.2495 inches
Internal Drive Style:
Offset cruciform (torque set)
Thread Diameter:
0.250 inches
Grip Length:
Between 0.240 inches and 0.260 inches
Thready Qty Per Inch (tpi):
28
Min. Tensile Strength (psi):
160000 pounds per square inch
Countersink Angle:
Between 99.0 degrees and 101.0 degrees
Surface Finish:
32.0 microinches grip
Surface Finish:
32.0 microinches threads
Material Specification:
Ams 5731 assn standard single material response or ams 5732 assn standard single material response or ams 5737 assn standard single material response
Surface Treatment Specification:
QQ-P-35 federal specification single treatment response
Specification Data:
80205-NAS1581 professional/industrial association standard
Manufacturer Cage:
80205
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