The Gear,spur, cataloged under National Stock Number 3020-01-083-8312, 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 General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems. Government technical data includes 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-083-8312 |
| Primary Part Number | 142D5196-2 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.4871 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.000 INCHES FIRST END IN |
| Teeth Quantity | 45 |
| Surface Treatment Document and Classification | MIL-C-16232 TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 2 PLAIN TRANSVERSELY THROUGH FACE |
| Nominal Distance Between Body Face and Protruding Hub End | 0.430 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 8 |
| Mounting Hole Nominal Diameter | 0.425 INCHES TRANSVERSELY THROUGH FACE IN |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 3.7500 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 3.908 INCHES IN |
| Surface Treatment | PHOSPHATE ZINC OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4140 OVERALL |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 0.280 INCHES SECOND END IN |
| Face Nominal Width | 0.280 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 |
|---|---|
| 142D5196-2 PRIMARY | General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems (USA) |
| Reference | Meaning |
|---|---|
| 142D5196-2 | 5/9 Secondary reference Astro Gear and Instrument Co Inc |
NSN 3020-01-083-8312 is a Gear,spur, manufactured by General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-083-8312 has 1 manufacturer part number on file: 142D5196-2 (General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems).
Key specifications for 142D5196-2: Bore Nominal Diameter: 0.4871 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.000 INCHES FIRST END IN; Teeth Quantity: 45; Surface Treatment Document and Classification: MIL-C-16232 TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 23 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.