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S638-1 — VALVE,REGULATING,FLUID PRESSURE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

S638-1: VALVE,REGULATING,FLUID PRESSURE.

VALVE,REGULATING,FLUID PRESSURE. Key specifications include filter: NOT INCLUDED, material: COPPER ALLOY BODY, body_style: STRAIGHT THRU, regulation_type: AUTOMATIC SINGLE STAGE, special_features: WITH GAGE, flow_control_device: DISK. This part is cataloged in the U.S.

Government catalog under NSN 5365-00-495-9589, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
S638-1
NSN: 5365-00-495-9589
NIINs: 004959589, 012936916
FSC: 5365 — Bushings, Rings, Shims, and Spacers
CAGE: 95019 — DANA CORP SPICER TRANSMISSION DIV (USA)
SPECIFICATIONS
filterNOT INCLUDED
materialCOPPER ALLOY BODY
body_styleSTRAIGHT THRU
regulation_typeAUTOMATIC SINGLE STAGE
special_featuresWITH GAGE
flow_control_deviceDISK
valve_loading_methodSPRING
end_connection_quantity2
first_end_connection_typeTHREADED INTERNAL PIPE
first_end_style_designatorPLAIN
first_end_thread_directionRIGHT-HAND
maximum_inlet_pressure_ratingERR-060
NSN5365-00-495-9589
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available VALVE,REGULATING,FLUID PRESSURE TITLE COMPONENT PN S638-1 MFR VALVE,REGULATING,FLUID
KEY FEATURES
•
FSC APPLICATION DATA: DRIVING AXLE PINION BEARING,TRUCK
•
STYLE DESIGNATOR: CIRCULAR
•
OUTSIDE DIAMETER: 1.750 INCHES NOMINAL IN
•
APERTURE DIAMETER: 1.141 INCHES NOMINAL IN
•
MATERIAL: STEEL
•
CONSTRUCTION: ONE-PIECE
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATADRIVING AXLE PINION BEARING,TRUCK
STYLE DESIGNATORCIRCULAR
OUTSIDE DIAMETER1.750 INCHES NOMINAL IN
APERTURE DIAMETER1.141 INCHES NOMINAL IN
MATERIALSTEEL
CONSTRUCTIONONE-PIECE
SUBSTITUTES & CROSS-REFERENCES 7
639973Reference document
Same NSN cross-reference
Reference document — Secondary reference
A804Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
30207-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
7372851Reference document
Same NSN cross-reference
Reference document — Secondary reference
GP4659BReference document
Same NSN cross-reference
Reference document — Secondary reference
SM30207-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S638-1?
S638-1 is a VALVE,REGULATING,FLUID PRESSURE.
What parts can replace S638-1?
There are 7 known substitutes for S638-1: 639973, A804, 30207-2 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S638-1?
S638-1 is cataloged in the U.S. Government catalog under NSN 5365-00-495-9589. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.