NAS1581K4T8X

View detailed technical data, stock status, and sourcing information for: NAS1581K4T8X
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-694-8711

Item Name Code

29294

Assigment Date

04/30/2021 (5 years ago)

A resilient metal item, circular or nearly circular, which is designed to be inserted into an internal or external groove and retained by its own spring action, or it may have external prongs or projections designed to be inserted into a hole and retained by spring action of the prongs which grip by imbedding into the material. For items having internal prongs which perform the same function, see push on nut. It is used to keep and/or lock a part(s) in position, as a ball bearing on a shaft or in a housing. See also clip, retaining and pin, lock. Excludes:ring, connecting, round.

flat countersunk head style, right-hand thread direction, 0.903 inches nominal fastener length, 0.403 inches nominal thread length, 3a thread class

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class: 3a
Thread Direction: right-hand
Thread Length: 0.403 inches nominal
Fastener Length: 0.903 inches nominal
Head Style: flat countersunk
Head Diameter: 0.3504 inches minimum and 0.3988 inches maximum
Grip Diameter: 0.2646 inches minimum and 0.2651 inches maximum
Internal Drive Style: offset cruciform (torque set)
End Item Identification: b1-bacft
Nominal Thread Diameter: 0.250 inches
Grip Length: 0.500 inches nominal
Thread Quantity Per Inch: 28
Minimum Tensile Strength: 3200 pounds per square inch
Countersink Angle: 99.0 degrees minimum and 101.0 degrees maximum
Material: titanium alloy uns r56400 overall
Material Document And Classification: ams4928 national std/spec single material response or ams4967 national std/spec single material response overall
Thread Series Designator: unjf

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
NAS1581K4T8X	Close Tolerance Screw

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 5305-01-694-8711?

The FSCG of the NSN 5305-01-694-8711 is 5305

Does the NSN 5305-01-694-8711 have a Schedule B code assigned?

Yes, the Schedule B code is 8108908000

Does NSN 5305-01-694-8711 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 5305-01-694-8711 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-694-8711 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 5305-01-694-8711 was assigned to the Federal Catalog?

It was assigned 5 years ago, on Fri, Apr 30, 2021