The Gear,spur, cataloged under National Stock Number 3020-00-015-8612, 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 Rtx Corporation Div Pratt & Whitney. Government technical data includes 29 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-00-015-8612 |
| Primary Part Number | 31123-1 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.390 INCHES BOTH ENDS IN |
| Teeth Quantity | 35 |
| Second Step Nominal Diameter | 1.060 INCHES FIRST END IN |
| Second Step Nominal Diameter | 1.060 INCHES SECOND END IN |
| Surface Treatment Document and Classification | MIL-C-13924,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 0.625 INCHES BOTH ENDS IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.855 INCHES BOTH ENDS IN |
| First Step Nominal Length | 0.365 INCHES FIRST END IN |
| First Step Nominal Length | 0.365 INCHES SECOND END IN |
| Nominal Overall Length | 2.144 INCHES IN |
| Second Step Nominal Length | 0.122 INCHES FIRST END IN |
| Second Step Nominal Length | 0.122 INCHES SECOND END IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | AMS 6265 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.7500 INCHES NOMINAL IN |
| Tooth Form | STUB |
| First Step Nominal Diameter | 0.984 INCHES SECOND END IN |
| First Step Nominal Diameter | 0.984 INCHES FIRST END IN |
| Hub Style Designator | 2 STEPS BOTH ENDS |
| Spline Quantity | 12 BOTH ENDS |
| End Nominal Length | 0.368 INCHES FIRST END IN |
| End Nominal Length | 0.368 INCHES SECOND END IN |
| Nominal Outside Diameter | 1.848 INCHES IN |
| Surface Treatment | OXIDE OVERALL |
| End Nominal Diameter | 0.875 INCHES FIRST END IN |
| End Nominal Diameter | 0.875 INCHES SECOND END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP E9310 OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 31123-1 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| 31123-1 | 5/9 Secondary reference Solar Turbines Incorporated Dba Solar Turbines Incorporated |
NSN 3020-00-015-8612 is a Gear,spur, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-015-8612 has 1 manufacturer part number on file: 31123-1 (Rtx Corporation Div Pratt & Whitney).
2 possible matches (shared part number, not a government interchangeability claim): 5342-01-009-6623, 6150-01-710-3134. Verify interchangeability with system specifications before substitution.
Key specifications for 31123-1: Bore Nominal Diameter: 1.390 INCHES BOTH ENDS IN; Teeth Quantity: 35; Second Step Nominal Diameter: 1.060 INCHES FIRST END IN; Second Step Nominal Diameter: 1.060 INCHES SECOND END IN. 29 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.
NSN 3020-00-015-8612 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.