The Gear,spur, cataloged under National Stock Number 3020-01-312-1978, 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 Lockheed Martin Corporation Div Rms. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-312-1978 |
| Primary Part Number | 77C701578PC71 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Lockheed Martin Corporation Div Rms |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.481 INCHES FIRST END IN |
| Teeth Quantity | 90 |
| Surface Treatment Document and Classification | MIL-F-14072 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.229 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | QQ-S-763 FED SPEC ALL MATERIAL RESPONSES BODY |
| Material Document and Classification | QQ-S-763 FED SPEC ALL MATERIAL RESPONSES HUB |
| Pitch Diameter | 1.4055 INCHES MINIMUM AND 1.4062 INCHES MAXIMUM IN |
| Hub Style Designator | PINNED FIRST END |
| Nominal Outside Diameter | 1.437 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 416 HUB |
| Material | STEEL COMP 302 OR STEEL COMP 303 BODY |
| Face Nominal Width | 0.125 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 |
|---|---|
| GP34-90-P2D | Secs Inc (USA) |
| G13-90-12D | Roller Bearing Co of America, Inc Div Pic Design (USA) |
| H22-90-P2 | Designatronics Incorporated Div Sterling Instruments Div (USA) |
| 77C701578PC71 PRIMARY | Lockheed Martin Corporation Div Rms (USA) |
| Reference | Meaning |
|---|---|
| 77C701578 | 7/1 Vendor item drawing reference Lockheed Martin Corporation Div Rms |
| 77C701578P071 | C/1 Advisory reference — outside the item-of-supply concept Lockheed Martin Corporation Div Rms |
NSN 3020-01-312-1978 is a Gear,spur, manufactured by Lockheed Martin Corporation Div Rms, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-312-1978 has 4 manufacturer part numbers on file: GP34-90-P2D (Secs Inc), G13-90-12D (Roller Bearing Co of America, Inc Div Pic Design), H22-90-P2 (Designatronics Incorporated Div Sterling Instruments Div), 77C701578PC71 (Lockheed Martin Corporation Div Rms).
Key specifications for 77C701578PC71: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.481 INCHES FIRST END IN; Teeth Quantity: 90; Surface Treatment Document and Classification: MIL-F-14072 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.