The Guard,mechanical Drive, cataloged under National Stock Number 3020-01-391-7738, 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 B.w. Elliott Manufacturing Co., Llc. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-391-7738 |
| Primary Part Number | S50078-004 |
| Item Name | Guard,mechanical Drive |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | B.w. Elliott Manufacturing Co., Llc |
| 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 |
|---|---|
| S50078-004 PRIMARY | B.w. Elliott Manufacturing Co., Llc (USA) |
| Reference | Meaning |
|---|---|
| 50078-4 | 5/9 Secondary reference Elliott B W Mfg Co Llc Flex Shaft and Valve Control Product Lines |
NSN 3020-01-391-7738 is a Guard,mechanical Drive, manufactured by B.w. Elliott Manufacturing Co., Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-391-7738 has 1 manufacturer part number on file: S50078-004 (B.w. Elliott Manufacturing Co., Llc).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-525-5603. Verify interchangeability with system specifications before substitution.
Key specifications for S50078-004: Special Features: FITS 1.250 IN HINGE JOINT P/N 50047-520 IN. 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.