The O-Ring, cataloged under National Stock Number 5331-01-438-1387, 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. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-438-1387 |
| Primary Part Number | 5K9090 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Cross-Sectional Height | 1.8 MILLIMETERS NOMINAL MM |
| Hardness Rating | 90.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 23.7 MILLIMETERS NOMINAL MM |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| 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 |
|---|---|
| 5K-9090 | Hastings Deering (aust) Pty Ltd (AUS) |
| 5K-9090 | Westrac Equipment Pty Ltd (AUS) |
| 5K-9090 | William Adams Pty Ltd (AUS) |
| 5K9090 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 10076414 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5331-01-438-1387 is a O-Ring, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-438-1387 has 4 manufacturer part numbers on file: 5K-9090 (Hastings Deering (aust) Pty Ltd), 5K-9090 (Westrac Equipment Pty Ltd), 5K-9090 (William Adams Pty Ltd), 5K9090 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 5K9090: Cross-Sectional Height: 1.8 MILLIMETERS NOMINAL MM; Hardness Rating: 90.0 SHORE DUROMETER A NOMINAL; Center Hole Diameter: 23.7 MILLIMETERS NOMINAL MM; End Item Identification: CATERPILLAR TRACTOR MODEL 950 F. 4 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.