The Gear,helical, cataloged under National Stock Number 3020-00-508-7499, 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 Raytheon Company Dba Raytheon Co. Government technical data includes 23 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-508-7499 |
| Primary Part Number | 3A2U25REVGPT1 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Raytheon Company Dba Raytheon Co |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.252 INCHES BOTH ENDS0.252 INCHES BOTH ENDS IN |
| Helix Angle | 19.7500 DEGREES19.7500 DEGREES |
| Hub Nominal Diameter | 0.500 INCHES FIRST END0.500 INCHES FIRST END IN |
| Teeth Quantity | 1717 |
| Body Style | PLAIN, SOLIDPLAIN, SOLID |
| Tooth Direction | RIGHTRIGHT |
| Bore Style | PLAIN BOTH ENDSPLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 1 THREADED TRANSVERSELY THROUGH HUB FIRST END1 THREADED TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 1.000 INCHES FIRST END1.000 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIXSINGLE HELIX |
| Nominal Overall Length | 1.500 INCHES1.500 INCHES IN |
| Style Designator | PROTRUDING HUBPROTRUDING HUB |
| Pitch Diameter | 0.5312 INCHES NOMINAL0.5312 INCHES NOMINAL IN |
| Tooth Form | STANDARDSTANDARD |
| Hub Style Designator | PINNED FIRST ENDPINNED FIRST END |
| Mounting Hole Nominal Thread Size | 0.164 INCHES TRANSVERSELY THROUGH HUB FIRST END0.164 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Nominal Outside Diameter | 0.596 INCHES0.596 INCHES IN |
| Mounting Hole Thread Quantity Per Inch | 32 TRANSVERSELY THROUGH HUB FIRST END32 TRANSVERSELY THROUGH HUB FIRST END |
| Pressure Angle | 14.5000 DEGREES14.5000 DEGREES |
| Material | COPPER ALLOY OVERALL |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) TRANSVERSELY THROUGH HUB FIRST END |
| Attachment Method | MOUNTING HOLEMOUNTING HOLE |
| Face Nominal Width | 0.500 INCHES0.500 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 |
|---|---|
| 3A2U2561 | Raytheon Company Dba Raytheon Co (USA) |
| 3A2U25REVGPT1 PRIMARY | Raytheon Company Dba Raytheon Co (USA) |
| Reference | Meaning |
|---|---|
| 3A2U25REVGPT1 | 5/9 Secondary reference Raytheon Company Div Corp |
| 3A2U2561 | 5/9 Secondary reference Raytheon Company Div Corp |
NSN 3020-00-508-7499 is a Gear,helical, manufactured by Raytheon Company Dba Raytheon Co, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-508-7499 has 2 manufacturer part numbers on file: 3A2U2561 (Raytheon Company Dba Raytheon Co), 3A2U25REVGPT1 (Raytheon Company Dba Raytheon Co).
Key specifications for 3A2U25REVGPT1: Bore Nominal Diameter: 0.252 INCHES BOTH ENDS0.252 INCHES BOTH ENDS IN; Helix Angle: 19.7500 DEGREES19.7500 DEGREES; Hub Nominal Diameter: 0.500 INCHES FIRST END0.500 INCHES FIRST END IN; Teeth Quantity: 1717. 23 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.