CMS0721-2

View detailed technical data, stock status, and sourcing information for: CMS0721-2
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-409-0899

Item Name Code

06660

Assigment Date

03/05/1995 (31 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.

0.594 inches minimum and 0.625 inches maximum fastener length, 0.170 inches minimum and 0.210 inches maximum thread length, right-hand thread direction, flat chamfer head style, 2a 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: 2a
Thread Direction: right-hand
Thread Length: 0.170 inches minimum and 0.210 inches maximum
Fastener Length: 0.594 inches minimum and 0.625 inches maximum
Head Style: flat chamfer
Head Diameter: 0.218 inches minimum and 0.226 inches maximum
Head Height: 0.134 inches minimum and 0.138 inches maximum
Washer Quantity: 1
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.138 inches
Width Across Flats: 0.109 inches minimum and 0.111 inches maximum
Features Provided: dry film lubricant
Thread Quantity Per Inch: 32
Minimum Tensile Strength: 160000 pounds per square inch
Minimum Yield Strength: 90000 pounds per square inch
Primary Washer Outside Diameter: 0.262 inches minimum and 0.282 inches maximum
Primary Washer Style: flat
Primary Washer Material Thickness: 0.016 inches minimum and 0.020 inches maximum
Material: iron alloy 660 fastener
Material: steel primary washer
Material Document And Classification: ams 5731 assn std single material response fastener
Material Document And Classification: qq-s-766, 300 series assn std all material responses primary washer
Surface Treatment: passivate fastener
Surface Treatment: passivate primary washer
Surface Treatment Document And Classification: qq-p-35 fed spec single treatment response fastener
Surface Treatment Document And Classification: qq-p-35 fed spec single treatment response primary washer
Thread Series Designator: unrc

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
A3101870-2	Assembled Washer Screw
CMS0721-2	Assembled Washer Screw
FIT7348-2	Assembled Washer Screw

FAQs

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

What is the FSCG of the NSN 5305-01-409-0899?

The FSCG of the NSN 5305-01-409-0899 is 5305

Does the NSN 5305-01-409-0899 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-409-0899 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 5305-01-409-0899 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-409-0899 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 5305-01-409-0899 was assigned to the Federal Catalog?

It was assigned 31 years ago, on Sun, Mar 5, 1995