803-2177525-M4XX-77

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-552-3769

Item Name Code

35224

Assigment Date

06/12/2007 (19 years ago)

A deformable material which prevents the passage of matter through the joint formed when two faces are joined. It may be metallic or nonmetallic, lubricated or impregnated, solid or hollow cross section. It may be made to any predetermined dimension and shape. Excludes:flat disks, items made of felt material and items having joints. For round metal and plastic items with an aperture and a solid rectangular cross section, see washer, flat; shim; bearing, washer, thrust; and spacer ring. Excludes:disk, valve; seal, nonmetallic angle; seal, nonmetallic channel; seal, nonmetallic special shaped section; shielding gasket, electronic; and ring, sealing jar.

0.970 inches nominal overall height, 0.500 inches nominal shoulder height, 0.803 inches minimum outside diameter, 2a thread class, 0.144 inches minimum shoulder width

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
Outside Diameter: 0.803 inches minimum
Overall Height: 0.970 inches nominal
Shoulder Height: 0.500 inches nominal
Shoulder Width: 0.144 inches minimum
End Item Identification: steam generator system on cgn 9; feedwater system on afs 3; valve mark sd 162 on ssn 688 class
Seat Radius: 0.031 inches maximum
Thread Quantity Per Inch: 16
Part Name Assigned By Controlling Agency: disc (stop valves)
Special Features: nickel copper (monel) or stainless steel disc for 0.75 inch valves
Material: nickel alloy or steel corrosion resisting
Material Document And Classification: mil-c-24252 cond ca-7 mil spec single material response
Media For Which Designed: water or oil or gas
Style Designator: plug
Thread Series Designator: un

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
803-2177525-M4XX-77	Valve Disk
803-2177525-S4XX-77	Valve Disk

FAQs

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

What is the FSCG of the NSN 4820-01-552-3769?

The FSCG of the NSN 4820-01-552-3769 is 4820

Does the NSN 4820-01-552-3769 have a Schedule B code assigned?

Yes, the Schedule B code is 8481909090

Does NSN 4820-01-552-3769 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 4820-01-552-3769 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-552-3769 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 4820-01-552-3769 was assigned to the Federal Catalog?

It was assigned 19 years ago, on Tue, Jun 12, 2007