The Gear,antibacklash,spur, cataloged under National Stock Number 3020-01-425-8211, 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 Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service. Government technical data includes 24 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-425-8211 |
| Primary Part Number | 12373388 |
| Item Name | Gear,antibacklash,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.187 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.248 INCHES SECOND END IN |
| Teeth Quantity | 33 |
| Clamping Surface Nominal Length | 0.250 INCHES SECOND END IN |
| Surface Treatment Document and Classification | MIL-STD-171 MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.310 INCHES SECOND END IN |
| Precision Classification | QUALITY NUMBER 10 |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | ASTM-A313 ASSN STD SINGLE MATERIAL RESPONSE SPRING |
| Material Document and Classification | ASTM-A582 ASSN STD SINGLE MATERIAL RESPONSE FIRST GEAR |
| Material Document and Classification | ASTM-A582 ASSN STD SINGLE MATERIAL RESPONSE HUB |
| Material Document and Classification | ASTM-A582 ASSN STD SINGLE MATERIAL RESPONSE SECOND GEAR |
| Pitch Diameter | 4.1250 INCHES NOMINAL IN |
| Hub Style Designator | SPLIT SECOND END |
| Nominal Outside Diameter | 4.359 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 303 FIRST GEAR |
| Material | STEEL COMP 302 SPRING |
| Material | STEEL COMP 303 SECOND GEAR |
| Material | STEEL COMP 303 HUB |
| Attachment Method | SLOT |
| Face Nominal Width | 0.250 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 |
|---|---|
| 12373388 | Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service (USA) |
| Reference | Meaning |
|---|---|
| A168-2-1 | 3/9 Design control — primary reference Astro Gear and Instrument Co Inc |
| 12373388 | 5/9 Secondary reference U S Army Tank Automotive Command Amsta-Im-Mm |
| 12373388 | 5/9 Secondary reference General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems |
NSN 3020-01-425-8211 is a Gear,antibacklash,spur, manufactured by Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-425-8211 has 1 manufacturer part number on file: 12373388 (Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service).
Key specifications for 12373388: Bore Nominal Diameter: 0.187 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.248 INCHES SECOND END IN; Teeth Quantity: 33; Clamping Surface Nominal Length: 0.250 INCHES SECOND END IN. 24 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.