The Chain Assembly, cataloged under National Stock Number 3020-01-503-4857, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Pegasus Manufacturing, Inc. Dba Pegasus Manufacturing. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Chain Assembly |
| FSC / FSG | 3020 — Gears, Pulleys, Sprockets, and Transmission Chain (FSG 30) |
| Manufacturers | Pegasus Manufacturing, Inc. Dba Pegasus Manufacturing (CAGE 33501) |
| Parameter | Value |
|---|---|
| NSN | 3020-01-503-4857 |
| Primary Part Number | B831-6700-A1 |
| Item Name | Chain Assembly |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Pegasus Manufacturing, Inc. Dba Pegasus Manufacturing |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| B831-6700-A1 PRIMARY | Pegasus Manufacturing, Inc. Dba Pegasus Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 596-7409750-A1 | 5/9 Secondary reference Naval Sea Systems Command |
| 7409742 | D/9 Drawing number reference only Naval Sea Systems Command |
| B831-6000-129 | 5/9 Secondary reference U.S. Government activity |
| B831-6700-A1 | 5/9 Secondary reference U.S. Government activity |
| 596-7409742-129 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 3020-01-503-4857 is a Chain Assembly, manufactured by Pegasus Manufacturing, Inc. Dba Pegasus Manufacturing, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-503-4857 has 1 manufacturer part number on file: B831-6700-A1 (Pegasus Manufacturing, Inc. Dba Pegasus Manufacturing).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-503-5687. Verify interchangeability with system specifications before substitution.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 3020-01-503-4857 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.