16990-4F-12

View detailed technical data, stock status, and sourcing information for: 16990-4F-12
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-420-2154

Item Name Code

16282

Assigment Date

10/11/1995 (30 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.

3a thread class, 0.750 inches nominal fastener length, 0.517 inches minimum and 0.588 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: 3a
Thread Direction: right-hand
Thread Length: 0.517 inches minimum and 0.588 inches maximum
Fastener Length: 0.750 inches nominal
Head Style: flat countersunk
Head Diameter: 0.480 inches minimum and 0.531 inches maximum
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.250 inches
Width Across Flats: 0.156 inches nominal
Thread Quantity Per Inch: 28
Minimum Tensile Strength: 160000 pounds per square inch
Hardness Rating: 36.0 rockwell c minimum and 43.0 rockwell c maximum overall
Countersink Angle: 80.0 degrees minimum and 82.0 degrees maximum
Color: black overall
Material: steel overall
Material Document And Classification: fed std 66, alloy fed std all material responses overall
Surface Treatment: oxide overall
Thread Series Designator: unrf

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
16990-4F-12	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-420-2154?

The FSCG of the NSN 5305-01-420-2154 is 5305

Does the NSN 5305-01-420-2154 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-420-2154 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 5305-01-420-2154 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-420-2154 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 5305-01-420-2154 was assigned to the Federal Catalog?

It was assigned 30 years ago, on Wed, Oct 11, 1995