634A478-1

View detailed technical data, stock status, and sourcing information for: 634A478-1
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Federal Supply Group

Engines, Turbines, and Components

Federal Supply Classification

2825 Steam Turbines and Components

National Stock Number

2825-00-278-1921

Item Name Code

11459

Assigment Date

01/01/1963 (63 years ago)

A circular, single or multipiece item, metallic or nonmetallic in composition, designed to be fitted in a circumferential groove in a piston and to spring outward against the cylinder wall to function as a seal or wiper. It is supplied in various cross-sectional shapes and is cut through at one point to allow for installation in the piston ring groove. It may include an expander. Excludes:packing, preformed; retainer, oil seal; retainer, packing; ring, retaining; ring wiper; and seal ring, metal.

10.500 inches standard bore diameter, 0.3590 inches minimum and 0.3750 inches maximum radial wall thickness, plain rectangular, straight face cross-sectional shape style, concentric ring style, 0.8720 inches nominal overall width

Product Characteristics

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

Cross-Sectional Shape Style: plain rectangular, straight face
Ring Style: concentric
Radial Wall Thickness: 0.3590 inches minimum and 0.3750 inches maximum
Overall Width: 0.8720 inches nominal
Standard Bore Diameter: 10.500 inches
Fsc Application Data: turbine,steam

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
634A478	Piston Ring
634A478-001	Piston Ring
634A478-1	Piston Ring

FAQs

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

What is the FSCG of the NSN 2825-00-278-1921?

The FSCG of the NSN 2825-00-278-1921 is 2825

Does the NSN 2825-00-278-1921 have a Schedule B code assigned?

Yes, the Schedule B code is 8406900040

Does NSN 2825-00-278-1921 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 2825-00-278-1921 contain precious materials?

Precious metal content is unknown

Does NSN 2825-00-278-1921 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 2825-00-278-1921 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963