The O-Ring, cataloged under National Stock Number 5331-01-385-9541, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Irl Thermal Systems Ltd. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Irl Thermal Systems Ltd (CAGE U1841) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-385-9541 |
| Primary Part Number | 44238-4021 ITEM 6 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Irl Thermal Systems Ltd |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 44238-4021 ITEM 6 | Irl Thermal Systems Ltd (GBR) |
| 38416-1008 | Irl Thermal Systems Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 38416-1008 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 44238-4021 ITEM 6 | 3/9 Design control — primary reference Allied Defense Industries, Llc Dba Ams Distribution |
NSN 5331-01-385-9541 is a O-Ring, manufactured by Irl Thermal Systems Ltd, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-385-9541 has 2 manufacturer part numbers on file: 44238-4021 ITEM 6 (Irl Thermal Systems Ltd), 38416-1008 (Irl Thermal Systems Ltd).
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.