The Gear,internal, cataloged under National Stock Number 3020-01-292-1636, 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. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-292-1636 |
| Primary Part Number | C78121/22-53 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Grimsleys House of Tools Inc |
| 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 |
|---|---|
| C78121/22-53 PRIMARY | Grimsleys House of Tools Inc (USA) |
| Reference | Meaning |
|---|---|
| PC 53 | 5/9 Secondary reference Short Thomas a Co |
| MARK I AND II PC 53 | 5/9 Secondary reference Short Thomas a Co |
| C78121-53 | 3/9 Design control — primary reference Short Thomas a Co |
NSN 3020-01-292-1636 is a Gear,internal, manufactured by Grimsleys House of Tools Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-292-1636 has 1 manufacturer part number on file: C78121/22-53 (Grimsleys House of Tools Inc).
Key specifications for C78121/22-53: End Item Identification: SHORT CUT ASSEMBLY,THOMAS SHORT COMPANY,MARK I AND II. 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.