The Gear,worm, cataloged under National Stock Number 3020-01-156-4897, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Gear,worm |
| FSC / FSG | 3020 — Gears, Pulleys, Sprockets, and Transmission Chain (FSG 30) |
| Manufacturers | B.w. Elliott Manufacturing Co., Llc (CAGE 72166) |
| Parameter | Value |
|---|---|
| NSN | 3020-01-156-4897 |
| Primary Part Number | S18978-501 |
| Item Name | Gear,worm |
| 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 |
|---|---|
| S18978-501 PRIMARY | B.w. Elliott Manufacturing Co., Llc (USA) |
| Reference | Meaning |
|---|---|
| 18978-501 | 5/9 Secondary reference Elliott B W Mfg Co Llc Flex Shaft and Valve Control Product Lines |
| 18978 | D/9 Drawing number reference only Elliott B W Mfg Co Llc Flex Shaft and Valve Control Product Lines |
| 3020PL1288699 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 3020-01-156-4897 is a Gear,worm, manufactured by B.w. Elliott Manufacturing Co., Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-156-4897 has 1 manufacturer part number on file: S18978-501 (B.w. Elliott Manufacturing Co., Llc).
4 possible matches (shared part number, not a government interchangeability claim): 5325-01-165-2788, 4720-01-170-4991, 5136-01-647-3979. 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.
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.