The Gear,spur, cataloged under National Stock Number 3020-00-955-3128, 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 Triumph Thermal Systems - Maryland, Inc.. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-955-3128 |
| Primary Part Number | 102790 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Triumph Thermal Systems - Maryland, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.7187 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.615 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.105 INCHES BOTH ENDS IN |
| Teeth Quantity | 53 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Bore Style | PLAIN BOTH ENDS |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM HUB |
| Hardness Rating | 58.0 ROCKWELL C NOMINAL TEETH |
| Style Designator | RECESSED HUBS |
| Material Document and Classification | AMS 6260 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.6500 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 2.7458 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.500 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 |
|---|---|
| 102790 PRIMARY | Triumph Thermal Systems - Maryland, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 102790 | 5/9 Secondary reference Four Star Precision Products Inc |
NSN 3020-00-955-3128 is a Gear,spur, manufactured by Triumph Thermal Systems - Maryland, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-955-3128 has 1 manufacturer part number on file: 102790 (Triumph Thermal Systems - Maryland, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-032-2411, 6685-01-498-4233. Verify interchangeability with system specifications before substitution.
Key specifications for 102790: Bore Nominal Diameter: 0.7187 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.615 INCHES FIRST END IN; Nominal Distance Between Body Face and Recessed Hub End: 0.105 INCHES BOTH ENDS IN; Teeth Quantity: 53. 16 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.