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NAS1581C4T3 Close Tolerance Screw

NSN: 5305-01-058-0752
Product Series: NAS
ECCN: EAR99
Schedule: 7318.15.9000

Unit of Measure: EA

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Head Style

Flat countersunk

Material

Iron alloy 660

Thread Class

Countersink Angle: 100.0 degrees
Fastener Length: Between 0.575 inches and 0.605 inches
Grip Diameter: Between 0.2490 inches and 0.2495 inches
Grip Length: Between 0.177 inches and 0.197 inches
Hardness Rating: 24.0 rockwell c and 35.0 rockwell c
Internal Drive Style: Offset cruciform (torque set)
Min. Tensile Strength (psi): 160000 pounds per square inch
Specification Data: 80205-nas1581 professional/industrial association standard
Surface Finish: 32.0 microinches grip
Thread Diameter: 0.250 inches
Thread Direction: Right-hand
Thread Length: Between 0.378 inches and 0.428 inches
Thread Qty Per Inch (tpi): 28
Thread Series Designator: Unjf (fine thread with external controlled root radius)
Head Diameter: Between 0.350 inches and 0.399 inches