The O-Ring, cataloged under National Stock Number 5331-01-721-9728, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-721-9728 |
| Primary Part Number | 126-1879 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 126-1879 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 5331-01-721-9728 is a O-Ring, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-721-9728 has 1 manufacturer part number on file: 126-1879 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 126-1879: Special Features: COMPATIBLE MODELS, WHEELED EXCAVATOR MH3040, EXCAVATOR 318B N, 320B N, 320B L, 320C L, 322B L, 345B II, 318C, 320B LU, 318B, 320B, 320C, 320B LL, MH3040, 322B, 322C, 319D L, 319D LN, 320C FM, 321C, 320B FM LL, 345C, 321B, 320B U, MATERIAL HANDLER MH3040, FOREST PRODUCTS 522, 521; Part Name Assigned by Controlling Agency: RING-SEALO. 0 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.