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NAS1581F4T9 Close Tolerance Screw

Product Series: NAS
ECCN: EAR99
Schedule: 7318.15.9000

Unit of Measure: EA

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Head Style

Flat countersunk

Material

Steel

Surface Treatment

Class 2 federal specification all treatment responses type 2 qq-p-416

Thread Class

Countersink Angle: Between 99.0 degrees and 101.0 degrees
Fastener Length: Between 0.951 inches and 0.981 inches
Grip Diameter: Between 0.2485 inches and 0.2495 inches
Grip Length: Between 0.553 inches and 0.573 inches
Internal Drive Style: Offset cruciform (torque set)
Material Specification: Mil-s-5626 military specification 1st material response or mil-s-5000 military specification 2nd material response or mil-s-6040 military specification 3rd material response
Min. Tensile Strength (psi): 160000 pounds per square inch
Specification Data: 80205-nas1581 professional/industrial association standard
Thread Diameter: 0.250 inches
Thread Direction: Right-hand
Thread Length: 0.403 inches
Thread Qty Per Inch (tpi): 28
Thread Series Designator: Unjf (fine thread with external controlled root radius)
Head Diameter: Between 0.3504 inches and 0.3988 inches