The Gear,spur, cataloged under National Stock Number 3020-01-286-0071, 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 21 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-286-0071 |
| Primary Part Number | 157D3638 |
| 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 | 0.563 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.900 INCHES BOTH ENDS IN |
| Teeth Quantity | 28 |
| Body Style | PLAIN, WITH LIGHTENING HOLES |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Mounting Hole Type and Quantity | 6 COUNTERBORED AXIALLY THROUGH BODY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.200 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.550 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 0.500 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | ASTM-A322 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM-A331 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.3333 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 19 BOTH ENDS |
| Nominal Outside Diameter | 2.560 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Bolt Hole Circle Nominal Diameter | 1.500 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| 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 |
|---|---|
| 157D3638 PRIMARY | General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems (USA) |
NSN 3020-01-286-0071 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 3020-01-286-0071 has 1 manufacturer part number on file: 157D3638 (General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems).
Key specifications for 157D3638: Bore Nominal Diameter: 0.563 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.900 INCHES BOTH ENDS IN; Teeth Quantity: 28; Body Style: PLAIN, WITH LIGHTENING HOLES. 21 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.