The Gear,antibacklash,spur, cataloged under National Stock Number 3020-01-055-7643, 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 Westfield Precision Products Inc West Coast Gear Products Div. Government technical data includes 26 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-055-7643 |
| Primary Part Number | 901044-1C |
| Item Name | Gear,antibacklash,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Westfield Precision Products Inc West Coast Gear Products Div |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.312 INCHES SECOND END IN |
| Hub Nominal Diameter | 2.750 INCHES BETWEEN BODY AND FLANGE IN |
| Teeth Quantity | 176 |
| Second Step Nominal Diameter | 0.500 INCHES FIRST END IN |
| Surface Treatment Document and Classification | MIL-STD-171,FINISH NO. 5.4.1 MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.044 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.282 INCHES FIRST END IN |
| First Step Nominal Length | 0.062 INCHES FIRST END IN |
| Second Step Nominal Length | 0.078 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.7500 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 0.302 INCHES FIRST END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | PLAIN SECOND END |
| End Nominal Length | 0.141 INCHES FIRST END IN |
| Nominal Outside Diameter | 2.781 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| End Nominal Diameter | 0.312 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Attachment Method | CLAMP |
| Face Nominal Width | 0.104 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 |
|---|---|
| 901044-1C | Designatronics Incorporated Div Sterling Instruments Div (USA) |
| 901044-1C PRIMARY | Westfield Precision Products Inc West Coast Gear Products Div (USA) |
| Reference | Meaning |
|---|---|
| 901044-1C | 5/9 Secondary reference Kosmo Gears |
| 901044-1C | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 901044 | D/9 Drawing number reference only U.S. Government activity |
| 901044-1C | 5/9 Secondary reference Marino Enterprises, Inc. Dba Gear Technology Div Gear Technology |
| 9830009W | 5/9 Secondary reference Westfield Precision Products Inc West Coast Gear Products Div |
NSN 3020-01-055-7643 is a Gear,antibacklash,spur, manufactured by Westfield Precision Products Inc West Coast Gear Products Div, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-055-7643 has 2 manufacturer part numbers on file: 901044-1C (Designatronics Incorporated Div Sterling Instruments Div), 901044-1C (Westfield Precision Products Inc West Coast Gear Products Div).
1 possible match (shared part number, not a government interchangeability claim): 5365-01-251-9293. Verify interchangeability with system specifications before substitution.
Key specifications for 901044-1C: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.312 INCHES SECOND END IN; Hub Nominal Diameter: 2.750 INCHES BETWEEN BODY AND FLANGE IN; Teeth Quantity: 176. 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.