5305-01-391-2890

Find complete technical information, availability, and procurement data for: 5305-01-391-2890
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-391-2890

Item Name Code

06657

Assigment Date

06/08/1994 (32 years ago)

A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use shim. For items fabricated from ceramic or electrically rated materials by specification or industry standards use insulator (1), washer. Excludes:disk, valve, graphite impregnated and lubricated items.

0.455 inches minimum and 0.465 inches maximum fastener length, 2a thread class, 0.430 inches minimum and 0.440 inches maximum thread length, flat countersunk head style, right-hand thread direction

Product Characteristics

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

Thread Class: 2a
Thread Direction: right-hand
Thread Length: 0.430 inches minimum and 0.440 inches maximum
Fastener Length: 0.455 inches minimum and 0.465 inches maximum
Head Style: flat countersunk
Head Diameter: 0.099 inches minimum and 0.119 inches maximum
Internal Drive Style: slot
Nominal Thread Diameter: 0.060 inches
Thread Quantity Per Inch: 80
Countersink Angle: 82.0 degrees nominal
Screw Material: copper alloy 260 or copper alloy 360
Screw Material Document And Classification: qq-b-626 fed spec 2nd material response or qq-b-626 fed spec 3rd material response
Screw Surface Treatment: tin
Screw Surface Treatment Document And Classification: mil-t-10727, ty1 mil spec single treatment response
Thread Series Designator: unf
Nondefinitive Spec/Std Data: 1 type and 2s style

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
2576672-8	Machine Screw

FAQs

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

What is the FSCG of the NSN 5305-01-391-2890?

The FSCG of the NSN 5305-01-391-2890 is 5305

Does the NSN 5305-01-391-2890 have a Schedule B code assigned?

Yes, the Schedule B code is 7415338550

Does NSN 5305-01-391-2890 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 5305-01-391-2890 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-391-2890 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 5305-01-391-2890 was assigned to the Federal Catalog?

It was assigned 32 years ago, on Wed, Jun 8, 1994