PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

31121Seat,valve

Pneudraulics, Inc. · NSN 4820-01-239-9925 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-239-9925 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-239-9925. Primary manufacturer part number: 31121.
Features
  • Seat,valve — FSC 4820
  • Material: STEEL COMP 440C BODY
  • Surface Treatment: PASSIVATE BODY
  • Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE BODY
  • Surface Treatment Document and Classification: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE BODY
  • 1 verified cross-reference
  • Primary manufacturer: Pneudraulics, Inc.
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Comp 440c Body construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-239-9925, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Pneudraulics, Inc.. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-239-9925
Primary Part Number31121
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerPneudraulics, Inc.
StatusACTIVE
MaterialSTEEL COMP 440C BODY
Surface TreatmentPASSIVATE BODY
Material Document and ClassificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE BODY
Surface Treatment Document and ClassificationMIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE BODY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
1630-00-050-2904 INTERCHANGEABLE
Wheel,landing Gear
4510-00-167-0409 INTERCHANGEABLE
Faucet,double
5315-00-222-71415315H23-000 INTERCHANGEABLE
Pin,straight,headless
Us Army Aviation and Missile Command
6730-00-396-3514 INTERCHANGEABLE
Leg,projector
5985-00-598-46493112-1 INTERCHANGEABLE
Waveguide Assembly
General Microwave Corporation Div Kratos Microwave Electronics
1630-00-764-4792 INTERCHANGEABLE
Wheel,landing Gear
3020-00-858-050731121 INTERCHANGEABLE
Gear,worm Wheel
Integral Aerospace, Llc Dba Pcx Aerosystems - Santa Ana Div Integral Aerospace, Llc Dba Pcx Aerosystems - Santa Ana
5930-01-248-454731-121 INTERCHANGEABLE
Switch,push
Eao Switch Corporation
3020-01-377-7455 INTERCHANGEABLE
Gear,internal
6515-01-417-8014311.21 INTERCHANGEABLE
Tap,bone Screw
Depuy Synthes Sales Inc Dba Depuy Synthes Trauma Div Depuy Synthes Sales, Inc., D/b/a Depuy Synthes Trauma
Cross-Reference Index
Part NumberManufacturer
31121 PRIMARY Pneudraulics, Inc. (USA)
Related Parts
1630-00-050-2904INTERCHANGEABLE
WHEEL,LANDING GEAR
4510-00-167-0409INTERCHANGEABLE
FAUCET,DOUBLE
5315-00-222-7141INTERCHANGEABLE
PIN,STRAIGHT,HEADLESS
5315H23-000
6730-00-396-3514INTERCHANGEABLE
LEG,PROJECTOR
5985-00-598-4649INTERCHANGEABLE
WAVEGUIDE ASSEMBLY
3112-1
1630-00-764-4792INTERCHANGEABLE
WHEEL,LANDING GEAR
3020-00-858-0507INTERCHANGEABLE
GEAR,WORM WHEEL
31121
5930-01-248-4547INTERCHANGEABLE
SWITCH,PUSH
31-121
3020-01-377-7455INTERCHANGEABLE
GEAR,INTERNAL
6515-01-417-8014INTERCHANGEABLE
TAP,BONE SCREW
311.21
6910-01-590-4579INTERCHANGEABLE
GAUZE,INERT,MOULAGE TRAINER
273
4140-01-649-4937INTERCHANGEABLE
SHROUD,FAN,AXIAL
31121

Frequently Asked Questions

What is NSN 4820-01-239-9925?

NSN 4820-01-239-9925 is a Seat,valve, manufactured by Pneudraulics, Inc., classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-239-9925?

NSN 4820-01-239-9925 has 1 cross-referenced part number: 31121 (Pneudraulics, Inc.).

What NSN replaces 4820-01-239-9925?

There are 12 known substitutes for 4820-01-239-9925: 1630-00-050-2904, 4510-00-167-0409, 5315-00-222-7141 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 31121?

Key specifications for 31121: Special Features: USED ON NSN 4820011879232 HYDRAULIC VALVE,B-1B ACFT; Material: STEEL COMP 440C BODY; Surface Treatment: PASSIVATE BODY; Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE BODY. 5 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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