0.250-20UNC-3AX2.250

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-329-9728

Item Name Code

16282

Assigment Date

11/28/1990 (35 years ago)

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. Excludes:bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.

right-hand thread direction, 3a thread class, flat chamfer head style, 2.250 inches nominal fastener length, 1.000 inches minimum and 1.500 inches maximum thread length

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: 1.000 inches minimum and 1.500 inches maximum
Fastener Length: 2.250 inches nominal
Head Style: flat chamfer
Head Diameter: 0.365 inches minimum and 0.375 inches maximum
Head Height: 0.244 inches minimum and 0.250 inches maximum
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.250 inches
Width Across Flats: 0.188 inches nominal
Thread Quantity Per Inch: 20
Minimum Tensile Strength: 130000 pounds per square inch
Minimum Yield Strength: 90000 pounds per square inch
Material: nickel alloy k-500 overall
Material Document And Classification: qq-n-286 cl a fed spec single material response overall
Thread Series Designator: unc
Nondefinitive Spec/Std Data: 6 type

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
0.250-20UNC-3AX2.250	Socket Head Cap Screw
FFS86TYVI1/4-20 UNC2AX1 1/4LG	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-329-9728?

The FSCG of the NSN 5305-01-329-9728 is 5305

Does the NSN 5305-01-329-9728 have a Schedule B code assigned?

Yes, the Schedule B code is 7508900000

Does NSN 5305-01-329-9728 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 5305-01-329-9728 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-329-9728 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 5305-01-329-9728 was assigned to the Federal Catalog?

It was assigned 35 years ago, on Wed, Nov 28, 1990