The O-Ring, cataloged under National Stock Number 5331-01-644-4201, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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
5331-01-644-4201
Item Name
O-Ring
FSC / FSG
5331 / 53 — O-ring
Status
ACTIVE
Material
RUBBER FLUOROSILICONE CLASS FQ
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 Items8
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
NSN 5331-01-644-4201 is a O-Ring, classified under FSC 5331, O-ring. Status: active.
What NSN replaces 5331-01-644-4201?
8 possible matches (shared part number, not a government interchangeability claim): 5331-01-644-4219, 5360-01-644-4417, 5360-01-644-4462. Verify interchangeability with system specifications before substitution.
What are the specifications of 5331-01-644-4201?
Key specifications for 5331-01-644-4201: Material: RUBBER FLUOROSILICONE CLASS FQ. 1 specification is documented in the U.S. Government catalog.
Is NSN 5331-01-644-4201 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.