The Gear,spur, cataloged under National Stock Number 3020-00-155-4380, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-155-4380 |
| Primary Part Number | 116C3781 |
| 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 | 0.779 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.000 INCHES BOTH ENDS IN |
| Teeth Quantity | 48 |
| Surface Treatment Document and Classification | MIL STD 171,FINISH 5.3.1.2 OR 5.3.2.2 MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, WITH LIGHTENING HOLES |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.310 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.120 INCHES SECOND END IN |
| Precision Classification | QUALITY NUMBER 9 |
| Hardness Rating | 60.0 ROCKWELL C NOMINAL TEETH |
| Hardness Rating | 25.0 ROCKWELL C NOMINAL HUB |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | QQ-S-624,COMP 8620-CANCELED FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 3.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 23 BOTH ENDS |
| Nominal Outside Diameter | 3.115 INCHES IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8620 OVERALL |
| Spline Pitch Diameter | 0.7188 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 0.650 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 |
|---|---|
| 116C3781 PRIMARY | General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems (USA) |
| Reference | Meaning |
|---|---|
| 116C378 | 5/9 Secondary reference General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems |
NSN 3020-00-155-4380 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 3020-00-155-4380 has 1 manufacturer part number on file: 116C3781 (General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems).
Key specifications for 116C3781: Bore Nominal Diameter: 0.779 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.000 INCHES BOTH ENDS IN; Teeth Quantity: 48; Surface Treatment Document and Classification: MIL STD 171,FINISH 5.3.1.2 OR 5.3.2.2 MIL STD 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.