The Sprocket Wheel, cataloged under National Stock Number 3020-01-140-3265, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-140-3265 |
| Primary Part Number | 139C6319-2 |
| Item Name | Sprocket Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems |
| Status | ACTIVE |
| Spline Minor Diameter | 0.437 INCHES NOMINAL IN |
| Hub Outside Diameter | 0.760 INCHES NOMINAL AA END IN |
| Design Form | PLAIN |
| Teeth Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM |
| Spline Length | 0.750 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Metallic Hardness Rating and Location | 30.0 ROCKWELL C MINIMUM BODY AND 35.0 ROCKWELL C MAXIMUM BODY |
| Material Document and Classification | MIL-S-18729, COMP 4130, COND N MIL SPEC 1ST MATERIAL RESPONSE AND MIL-S-6758, COND N MIL SPEC 2ND MATERIAL RESPONSE |
| Spline Major Diameter | 0.525 INCHES NOMINAL IN |
| Bore Type | INVOLUTE SPLINE |
| Teeth Row Quantity | 1 |
| Teeth Quantity Per Row | 4 |
| Spline Pressure Angle in Deg | 30.0 |
| Protruding Hub Characteristic | PLAIN |
| Hardness Rating Test Method | ROCKWELL |
| Spline Quantity | 15 |
| Distance From Hub End to Flange End | 0.600 INCHES NOMINAL AA END IN |
| Surface Treatment | PHOSPHATE |
| Material | STEEL COMP 4130 |
| Face Width | 0.150 INCHES NOMINAL IN |
| Spline Pitch Diameter | 0.468 INCHES NOMINAL 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 |
|---|---|
| 139C6319-2 PRIMARY | General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems (USA) |
| Reference | Meaning |
|---|---|
| 10106709 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 139C6319 | D/9 Drawing number reference only General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems |
NSN 3020-01-140-3265 is a Sprocket Wheel, manufactured by General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-140-3265 has 1 manufacturer part number on file: 139C6319-2 (General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-228-4377. Verify interchangeability with system specifications before substitution.
Key specifications for 139C6319-2: Spline Minor Diameter: 0.437 INCHES NOMINAL IN; Hub Outside Diameter: 0.760 INCHES NOMINAL AA END IN; Design Form: PLAIN; Teeth Hardness Rating: 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM. 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.