The Gear,antibacklash,spur, cataloged under National Stock Number 3020-00-628-0238, 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 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-628-0238 |
| Primary Part Number | 77C708688P12 |
| Item Name | Gear,antibacklash,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 | 0.375 INCHES FIRST END IN |
| Backlash Designation | GRADE D |
| Teeth Quantity | 75 |
| Surface Treatment Document and Classification | MIL F 14072 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.250 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Nominal Overall Length | 0.375 INCHES IN |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | FED STD 66,AISI 302/SAE30302 FED STD 1ST MATERIAL RESPONSE OR FED STD 66,AISI 303.SAE 30303 FED STD 2ND MATERIAL RESPONSE OR FED STD 66,AISI 416.SAE 51416 FED STD 3RD MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.1718 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PINNED FIRST END |
| Nominal Outside Diameter | 1.2031 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 416 OVERALL |
| 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 |
|---|---|
| 77C708688P12 PRIMARY | Lockheed Martin Corporation Div Rms (USA) |
| AB250-75-250/SS-P2 | Southern Gear & Machine Inc (USA) |
| Reference | Meaning |
|---|---|
| 77C708688P012 | C/1 Advisory reference — outside the item-of-supply concept Lockheed Martin Corporation Div Rms |
| AB250-75-250SSP | C/1 Advisory reference — outside the item-of-supply concept Southern Gear & Machine Inc |
NSN 3020-00-628-0238 is a Gear,antibacklash,spur, manufactured by Lockheed Martin Corporation Div Rms, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-628-0238 has 2 manufacturer part numbers on file: 77C708688P12 (Lockheed Martin Corporation Div Rms), AB250-75-250/SS-P2 (Southern Gear & Machine Inc).
Key specifications for 77C708688P12: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.375 INCHES FIRST END IN; Backlash Designation: GRADE D; Teeth Quantity: 75. 19 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.