NAS1581K4T4

Screw, Close Tolerance

Part number

NAS1581K4T4

NSN

5305-01-334-0524

NIIN

01-334-0524

Item name

Screw, Close Tolerance

Manufacturer

National Aerospace Standards

CAGE code

80205

FSC

5305

Unit of issue

EA

DEMIL code

A

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Manufacturer references (FLIS)

• National Aerospace Standards CAGE 80205

Technical characteristics

Thread Class

3A

Thread Direction

Right-hand

Thread Length

0.403 inches nominal

Fastener Length

0.638 inches minimum and 0.668 inches maximum

Head Style

Flat countersunk

Head Diameter

0.3504 inches minimum and 0.3988 inches maximum

Grip Diameter

0.2490 inches minimum and 0.2495 inches maximum

Internal Drive Style

Offset cruciform (torque set)

Nominal Thread Diameter

0.250 inches

Grip Length

0.240 inches minimum and 0.260 inches maximum

Thread Quantity per Inch

28

Countersink Angle

99.0 degrees minimum and 101.0 degrees maximum

Material

Titanium alloy uns R56400 overall

Material Document and Classification

AMS4928 assn std single material response overall or AMS4967 assn std single material response overall

Thread Series Designator

UNJF

Specification/Standard Data

80205-NAS1581 professional/industrial association standard

Logistics & compliance

Precious metals indicator (PMIC)

A

Weapon systems and platforms

• Aircraft Airlifter C-17A

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