The Gear,bevel, cataloged under National Stock Number 3020-00-657-5972, 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 Naval Sea Systems Command. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 3020-00-657-5972 |
| Primary Part Number | 1202378 |
| Item Name | Gear,bevel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Hub Spline Quantity | 33 SECOND END |
| Bore Nominal Diameter | 1.250 INCHES BOTH ENDS IN |
| Teeth Quantity | 20 |
| Surface Treatment Document and Classification | MIL-C-14550,CLASS 3 OR 4 MIL SPEC SINGLE TREATMENT RESPONSE TEETH |
| Body Style | WEBBED, OFFSET, SOLID |
| Pitch Angle | 45.0000 DEGREES |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 3 PLAIN AXIALLY THROUGH BODY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 2.750 INCHES SECOND END IN |
| Mounting Hole Nominal Diameter | 0.188 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Teeth Type | STRAIGHT |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM TEETH |
| Nominal Overall Length | 3.625 INCHES IN |
| Style Designator | PERIPHERAL FACE, BACK HUB PROTRUDING |
| Material Document and Classification | QQ-S-624,COND N FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Pitch Diameter | 4.0000 INCHES NOMINAL IN |
| Hub Style Designator | EXTERNALLY SPLINED, INVOLUTE SPLINES SECOND END |
| Nominal Outside Diameter | 4.283 INCHES IN |
| Surface Treatment | COPPER TEETH |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8620 OR STEEL COMP 4620H OVERALL |
| Hub Spline Pitch Diameter | 1.6500 INCHES NOMINAL SECOND END IN |
| Bolt Hole Circle Nominal Diameter | 2.000 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.850 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 |
|---|---|
| 1202378 | Humphrey Products Co (USA) |
| 1202378 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| DSG1388 | 5/2 Secondary reference U.S. Government activity |
| 1202378 | 5/9 Secondary reference U.S. Government activity |
| DSG1388 | 5/9 Secondary reference Napco Intl Inc |
NSN 3020-00-657-5972 is a Gear,bevel, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-657-5972 has 2 manufacturer part numbers on file: 1202378 (Humphrey Products Co), 1202378 (Naval Sea Systems Command).
Key specifications for 1202378: Hub Spline Quantity: 33 SECOND END; Bore Nominal Diameter: 1.250 INCHES BOTH ENDS IN; Teeth Quantity: 20; Surface Treatment Document and Classification: MIL-C-14550,CLASS 3 OR 4 MIL SPEC SINGLE TREATMENT RESPONSE TEETH. 25 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.