The Gear,internal, cataloged under National Stock Number 3020-01-129-2906, 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 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-129-2906 |
| Primary Part Number | 803-5001048 REV A PIECE 21 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.5000 INCHES BOTH ENDS IN |
| Teeth Quantity | 42 |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Teeth Type | SPUR |
| Nominal Overall Length | 3.940 INCHES IN |
| Pitch Diameter | 4.2000 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Spline Quantity | 10 BOTH ENDS |
| Nominal Outside Diameter | 5.3430 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| 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 |
|---|---|
| 803-5001048 REV A PIECE 21 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 803-5001048 REV A | D/9 Drawing number reference only Naval Sea Systems Command |
| 803-5001048 PIE | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 3020-01-129-2906 is a Gear,internal, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-129-2906 has 1 manufacturer part number on file: 803-5001048 REV A PIECE 21 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-144-3781, 4730-01-166-6835. Verify interchangeability with system specifications before substitution.
Key specifications for 803-5001048 REV A PIECE 21: Bore Nominal Diameter: 1.5000 INCHES BOTH ENDS IN; Teeth Quantity: 42; Bore Style: STRAIGHT SPLINE BOTH ENDS; Teeth Type: SPUR. 10 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.