The Gear,helical, cataloged under National Stock Number 3020-00-243-7281, 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 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-243-7281 |
| Primary Part Number | 27105B |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Brinkley Technology Group Llc Dba Hercules Manufacturing |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.875 INCHES BOTH ENDS IN |
| Helix Angle | 39.5167 DEGREES |
| Hub Nominal Diameter | 1.8125 INCHES BOTH ENDS IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.0615 INCHES SECOND END IN |
| Teeth Quantity | 31 |
| Body Style | WEBBED, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | PLAIN BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 92.8 ROCKWELL C MINIMUM AND 99.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | ONE FLUSH HUB, ONE RECESSED HUB |
| Pitch Diameter | 4.0176 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 4.2176 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.749 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 |
|---|---|
| 27105B PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 27105B | 5/9 Secondary reference Hercules Engine Co Inc |
NSN 3020-00-243-7281 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 3020-00-243-7281 has 1 manufacturer part number on file: 27105B (Brinkley Technology Group Llc Dba Hercules Manufacturing).
Key specifications for 27105B: Bore Nominal Diameter: 0.875 INCHES BOTH ENDS IN; Helix Angle: 39.5167 DEGREES; Hub Nominal Diameter: 1.8125 INCHES BOTH ENDS IN; Nominal Distance Between Body Face and Recessed Hub End: 0.0615 INCHES SECOND END IN. 18 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.