The Seat,valve, cataloged under National Stock Number 4820-00-133-0635, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-00-133-0635
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Body Outside Diameter
1.373 INCHES NOMINAL IN
Style Designator
PLAIN
Body Inside Diameter
0.813 INCHES NOMINAL IN
Material
PLASTIC POLYTETRAFLUOROETHYLENE OVERALL
Seat Angle in Deg
45.000 NOMINAL
Seating Surface Shape
ANGULAR
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
6150-00-549-389716318POSSIBLE MATCH
LEAD,ELECTRICAL
Possible match (shared part number)Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp.
5998-00-938-644816318POSSIBLE MATCH
PRINTED CIRCUIT BOARD
Possible match (shared part number)Custom Metering Company Inc
5365-01-173-3483163-18POSSIBLE MATCH
SHIM SET
Possible match (shared part number)Circor Naval Solutions Llc Dba Warren Pumps
5305-01-179-2842163-18POSSIBLE MATCH
SCREW,MACHINE
Possible match (shared part number)Cnh Industrial America Llc Dba Cnh America
6515-01-590-5564212.129POSSIBLE MATCH
SCREW,BONE
Possible match (shared part number)Depuy Synthes Sales Inc Dba Depuy Synthes Trauma Div Depuy Synthes Sales, Inc., D/b/a Depuy Synthes Trauma
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
16318
3/9Design control — primary reference
U.S. Government activity
C01183
5/9Secondary reference
U.S. Government activity
Related Parts
6150-00-549-3897POSSIBLE MATCH
LEAD,ELECTRICAL
16318
5998-00-938-6448POSSIBLE MATCH
PRINTED CIRCUIT BOARD
16318
5365-01-173-3483POSSIBLE MATCH
SHIM SET
163-18
5305-01-179-2842POSSIBLE MATCH
SCREW,MACHINE
163-18
6515-01-590-5564POSSIBLE MATCH
SCREW,BONE
212.129
Frequently Asked Questions
What is NSN 4820-00-133-0635?
NSN 4820-00-133-0635 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-00-133-0635?
5 possible matches (shared part number, not a government interchangeability claim): 6150-00-549-3897, 5998-00-938-6448, 5365-01-173-3483. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-00-133-0635?
Key specifications for 4820-00-133-0635: Overall Height: 0.250 INCHES NOMINAL IN; Body Outside Diameter: 1.373 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 0.813 INCHES NOMINAL IN. 6 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-133-0635 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.