The O-Ring, cataloged under National Stock Number 5331-01-537-6888, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Andrea Systems Llc. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-537-6888 |
| Primary Part Number | 04416620 436 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Andrea Systems Llc |
| Status | ACTIVE |
| Cross-Sectional Height | 0.125 INCHES NOMINAL IN |
| Hardness Rating | 90.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 1.000 INCHES NOMINAL IN |
| 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 |
|---|---|
| 04416620 436 | Warren Controls, Inc. (USA) |
| 04416620 436 PRIMARY | Andrea Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| MS28778-214 | 5/9 Secondary reference U.S. Government activity |
| 30805987 ITEM 24 | 5/9 Secondary reference Warren Controls, Inc. |
| 04416620 436 | 3/9 Design control — primary reference Andrea Electronics Corporation |
NSN 5331-01-537-6888 is a O-Ring, manufactured by Andrea Systems Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-537-6888 has 2 manufacturer part numbers on file: 04416620 436 (Warren Controls, Inc.), 04416620 436 (Andrea Systems Llc).
Key specifications for 04416620 436: Cross-Sectional Height: 0.125 INCHES NOMINAL IN; Hardness Rating: 90.0 SHORE DUROMETER A NOMINAL; Special Features: THIS IS A AS-568-14 ITEM, PER MFR;; Center Hole Diameter: 1.000 INCHES NOMINAL IN. 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.