The O-Ring, cataloged under National Stock Number 5331-01-318-4558, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
O-Ring
FSC / FSG
5331 — O-ring (FSG 53)
Technical Specifications
Parameter
Value
NSN
5331-01-318-4558
Item Name
O-Ring
FSC / FSG
5331 / 53 — O-ring
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
⇄Related Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
3920-01-544-032911154POSSIBLE MATCH
TRUCK,LIFT,CYLINDER
Possible match (shared part number)Unidex Corporation of Western N.y. Dba Unidex
4940-01-628-0558SKK15-J1C1/4-PKPOSSIBLE MATCH
ADAPTER,MECHANICAL TEST
Possible match (shared part number)Stauff Corp
5640-01-658-010611154POSSIBLE MATCH
INSULATION TAPE,THERMAL
Possible match (shared part number)Thermo-Tec
5120-01-664-9938POSSIBLE MATCH
WRENCH,BOX AND OPEN END,COMBINAT
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
11154
3/2Design control — primary reference
U.S. Government activity
Related Parts
3920-01-544-0329POSSIBLE MATCH
TRUCK,LIFT,CYLINDER
11154
4940-01-628-0558POSSIBLE MATCH
ADAPTER,MECHANICAL TEST
SKK15-J1C1/4-PK
5640-01-658-0106POSSIBLE MATCH
INSULATION TAPE,THERMAL
11154
5120-01-664-9938POSSIBLE MATCH
WRENCH,BOX AND OPEN END,COMBINAT
Frequently Asked Questions
What is NSN 5331-01-318-4558?
NSN 5331-01-318-4558 is a O-Ring, classified under FSC 5331, O-ring. Status: active.
What NSN replaces 5331-01-318-4558?
4 possible matches (shared part number, not a government interchangeability claim): 3920-01-544-0329, 4940-01-628-0558, 5640-01-658-0106. Verify interchangeability with system specifications before substitution.
Is NSN 5331-01-318-4558 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.