The Gear,worm, cataloged under National Stock Number 3020-01-251-5903, 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 Emerson Electric Co Browning Mfg Div. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-251-5903 |
| Primary Part Number | W4A-1G |
| Item Name | Gear,worm |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Emerson Electric Co Browning Mfg Div |
| Status | ACTIVE |
| Thread Form Direction | RIGHT-HAND |
| Keyway Nominal Width | 0.312 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 1.250 INCHES BOTH ENDS IN |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Face Type | STRAIGHT |
| Style Designator | HUBLESS |
| Material Document and Classification | ASTMA108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 3.0000 INCHES NOMINAL IN |
| Thread Form Quantity | 1 |
| Nominal Outside Diameter | 3.500 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.156 INCHES BOTH ENDS IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 4.500 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 |
|---|---|
| W4A-1G PRIMARY | Emerson Electric Co Browning Mfg Div (USA) |
| Reference | Meaning |
|---|---|
| 5029219-007-101 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 3020-01-251-5903 is a Gear,worm, manufactured by Emerson Electric Co Browning Mfg Div, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-251-5903 has 1 manufacturer part number on file: W4A-1G (Emerson Electric Co Browning Mfg Div).
Key specifications for W4A-1G: Thread Form Direction: RIGHT-HAND; Keyway Nominal Width: 0.312 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.250 INCHES BOTH ENDS IN; Bore Style: W/ KEYWAY BOTH ENDS. 14 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.