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NAS1581A4T4 Close Tolerance Screw

Product Series: NAS
ECCN: EAR99
Schedule: 7318.15.2091

Unit of Measure: EA

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Head Style

Flat countersunk

Material

Stee

Surface Treatment

Class 2 federal specification single treatment response type 2 qq-p-416

Thread Class

Countersink Angle: 100.0 degrees
Fastener Length: Between 0.638 inches and 0.668 inches
Grip Diameter: Between 0.2485 inches and 0.2495 inches
Grip Length: Between 0.240 inches and 0.260 inches
Hardness Rating: 36.0 rockwell c and 40.0 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 threads
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