The O-Ring, cataloged under National Stock Number 5331-01-029-9921, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 15 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-029-9921 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Status | ACTIVE |
| Cross-Sectional Height | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Hardness Rating | 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | MIL-R-25897,TY 1 MIL SPEC SINGLE MATERIAL RESPONSE |
| Elongation Percentage | 125 MAXIMUM |
| Center Hole Diameter | 1.293 INCHES MINIMUM AND 1.305 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROCARBON CLASS FPM |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| 62930-5 ITEM 14 | 5/1 Secondary reference U.S. Government activity |
| M83248-2-125CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 4400171-1250 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| ARP568-125MILR25897TY1C1CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| M83248-2-125 | 5/1 Secondary reference U.S. Government activity |
| L180-125CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| ARP568-125MILR25897TY1CL1 | 3/1 Design control — primary reference Sae International Dba Sae International |
| 62930-5 ITEM 14CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| M83248/2-125 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| L180-125CP | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 63750-101 ITEM 26CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| L180-125 | 5/1 Secondary reference U.S. Government activity |
| 52660-300 ITEM 22 | 5/1 Secondary reference U.S. Government activity |
| 52660-300 ITEM 22CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| ARP568-125MILR25897TY1CL1 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5331-01-029-9921 is a O-Ring, classified under FSC 5331, O-ring. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5331-01-184-7576, 5331-01-517-6066. Verify interchangeability with system specifications before substitution.
Key specifications for 5331-01-029-9921: Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Hardness Rating: 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM; Criticality Code Justification: ZZZY; Material Document and Classification: MIL-R-25897,TY 1 MIL SPEC SINGLE MATERIAL RESPONSE. 8 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.