The Gear,helical, cataloged under National Stock Number 3020-00-528-1725, 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 Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions. Government technical data includes 18 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through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-528-1725 |
| Primary Part Number | A3211960 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
| Status | ACTIVE |
| Keyway Nominal Width | 0.187 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.7502 INCHES BOTH ENDS IN |
| Helix Angle | 5.0000 DEGREES |
| Teeth Quantity | 10 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 52.0 ROCKWELL C MINIMUM AND 57.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | HUBLESS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 2.3960 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.4840 INCHES BOTH ENDS IN |
| Pressure Angle | 30.0000 DEGREES |
| Material | STEEL COMP 4140 OVERALL |
| Face Nominal Width | 2.625 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 |
|---|---|
| A3211960 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| LA63472 | 5/9 Secondary reference U.S. Government activity |
| LH63611PC10-8 | 5/9 Secondary reference U.S. Government activity |
| LH63611PC10-8 | 5/9 Secondary reference U.S. Government activity |
| LH63611PC10-8 | C/1 Advisory reference — outside the item-of-supply concept Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand |
| A3211960 | 3/9 Design control — primary reference Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand |
| LA63472 | C/1 Advisory reference — outside the item-of-supply concept Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand |
| A3211960 | 5/9 Secondary reference U.S. Government activity |
| LA63472 | 5/9 Secondary reference U.S. Government activity |
| A3211960 | 5/9 Secondary reference U.S. Government activity |
| 63472 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 3211960 | 5/2 Secondary reference U.S. Government activity |
NSN 3020-00-528-1725 is a Gear,helical, manufactured by Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-528-1725 has 1 manufacturer part number on file: A3211960 (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-295-6864. Verify interchangeability with system specifications before substitution.
Key specifications for A3211960: Keyway Nominal Width: 0.187 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.7502 INCHES BOTH ENDS IN; Helix Angle: 5.0000 DEGREES; Teeth Quantity: 10. 18 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.