The Gear,bevel, cataloged under National Stock Number 3020-01-292-9646, 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 Grimsleys House of Tools Inc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 3020-01-292-9646 |
| Primary Part Number | C78121/22-8 |
| Item Name | Gear,bevel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Grimsleys House of Tools Inc |
| Status | ACTIVE |
| Bore Style | PLAIN BOTH ENDS |
| Style Designator | PERIPHERAL FACE, BACK HUB PROTRUDING |
| 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 |
|---|---|
| C78121/22-8 PRIMARY | Grimsleys House of Tools Inc (USA) |
| Reference | Meaning |
|---|---|
| MARK I AND II PC 8 | 5/9 Secondary reference Short Thomas a Co |
| PC 8 | 5/9 Secondary reference Short Thomas a Co |
| C78121-8 | 3/9 Design control — primary reference Short Thomas a Co |
| PC 8 | 5/9 Secondary reference Wheelabrator-Frye Inc Balcrank Products |
NSN 3020-01-292-9646 is a Gear,bevel, manufactured by Grimsleys House of Tools Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-292-9646 has 1 manufacturer part number on file: C78121/22-8 (Grimsleys House of Tools Inc).
1 possible match (shared part number, not a government interchangeability claim): 6515-01-709-0377. Verify interchangeability with system specifications before substitution.
Key specifications for C78121/22-8: Bore Style: PLAIN BOTH ENDS; Style Designator: PERIPHERAL FACE, BACK HUB PROTRUDING; End Item Identification: SHORT CUT ASSEMBLY,MARK I AND II,THOMAS SHORT COMPANY. 2 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.