The Gear,helical, cataloged under National Stock Number 3020-00-678-6085, 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 26 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-678-6085 |
| Primary Part Number | 255065B |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Brinkley Technology Group Llc Dba Hercules Manufacturing |
| Status | ACTIVE |
| Keyway Nominal Width | 0.251 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 1.250 INCHES BOTH ENDS IN |
| Helix Angle | 15.3249 DEGREES |
| Hub Nominal Diameter | 1.684 INCHES SECOND END IN |
| Teeth Quantity | 50 |
| Body Style | WEBBED, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.125 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.502 INCHES FIRST END IN |
| First Step Nominal Length | 0.311 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 197.0 BRINELL STANDARD MINIMUM AND 235.0 BRINELL STANDARD MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 6.4790 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 2.000 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| Hub Style Designator | PLAIN SECOND END |
| End Nominal Length | 0.190 INCHES FIRST END IN |
| Nominal Outside Diameter | 7.227 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.745 INCHES BOTH ENDS IN |
| End Nominal Diameter | 1.623 INCHES FIRST END IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.875 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 |
|---|---|
| 255065B PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| P1157 | Bogue Systems Inc Dba Bogue Systems Inc (USA) |
| 559D1-0618 | Kurz & Root Generator Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| P1157 | 5/9 Secondary reference Bogue Electric Manufacturing Co |
| 255065B | 5/9 Secondary reference Hercules Engine Co Inc |
NSN 3020-00-678-6085 is a Gear,helical, manufactured by Brinkley Technology Group Llc Dba Hercules Manufacturing, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-678-6085 has 3 manufacturer part numbers on file: 255065B (Brinkley Technology Group Llc Dba Hercules Manufacturing), P1157 (Bogue Systems Inc Dba Bogue Systems Inc), 559D1-0618 (Kurz & Root Generator Company, Llc).
2 possible matches (shared part number, not a government interchangeability claim): 4310-01-527-2167, 5915-01-676-6644. Verify interchangeability with system specifications before substitution.
Key specifications for 255065B: Keyway Nominal Width: 0.251 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.250 INCHES BOTH ENDS IN; Helix Angle: 15.3249 DEGREES; Hub Nominal Diameter: 1.684 INCHES SECOND END IN. 26 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.