The Gear,spur, cataloged under National Stock Number 3020-00-200-2178, 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 Brinkley Technology Group Llc Dba Hercules Manufacturing. Government technical data includes 13 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-200-2178 |
| Primary Part Number | 27478C |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Brinkley Technology Group Llc Dba Hercules Manufacturing |
| Status | ACTIVE |
| Bore Nominal Diameter | 10.999 INCHES BOTH ENDS IN |
| Teeth Quantity | 97 |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM TEETH |
| Style Designator | HUBLESS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 1050 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 11.8450 INCHES MINIMUM AND 11.8550 INCHES MAXIMUM IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 12.050 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL COMP 1050 OVERALL |
| Face Nominal Width | 0.547 INCHES IN |
| 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 |
|---|---|
| 27478C PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 28437C | 5/9 Secondary reference Hercules Engine Co Inc |
| 27478C | 5/9 Secondary reference Hercules Engine Co Inc |
| 27516RG | 5/9 Secondary reference Hercules Engine Co Inc |
| 28437C | 5/9 Secondary reference Brinkley Technology Group Llc Dba Hercules Manufacturing |
| 27516RG | 5/9 Secondary reference Brinkley Technology Group Llc Dba Hercules Manufacturing |
NSN 3020-00-200-2178 is a Gear,spur, manufactured by Brinkley Technology Group Llc Dba Hercules Manufacturing, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-200-2178 has 1 manufacturer part number on file: 27478C (Brinkley Technology Group Llc Dba Hercules Manufacturing).
Key specifications for 27478C: Bore Nominal Diameter: 10.999 INCHES BOTH ENDS IN; Teeth Quantity: 97; Body Style: PLAIN, SOLID; Bore Style: PLAIN BOTH ENDS. 13 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.