The Sprocket Wheel, cataloged under National Stock Number 3020-01-357-7173, 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 Niantic Tool, Inc. Dba Niantic Tool Co. Government technical data includes 28 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-357-7173 |
| Primary Part Number | 53X-02-221 |
| Item Name | Sprocket Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Niantic Tool, Inc. Dba Niantic Tool Co |
| Status | ACTIVE |
| Hub Outside Diameter | 4.250 INCHES NOMINAL AA END IN |
| Securing Method | DRILLED HOLE |
| Bore Length | 1.810 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Tooth Pitch | 0.551 INCHES NOMINAL IN |
| Outside Diameter | 6.559 INCHES NOMINAL IN |
| Keying Facility Type | KEYWAY |
| Quantity | 1 |
| Style Designator | PLAIN |
| Pitch Diameter | 6.667 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Counterbore Depth | 0.810 INCHES NOMINAL IN |
| Groove Quantity | 1 |
| Teeth Row Quantity | 1 |
| Teeth Quantity Per Row | 38 |
| Counterbore Location | BB END |
| Protruding Hub Characteristic | PLAIN |
| Hardness Rating Test Method | NOT RATED |
| Counterbore Diameter | 3.626 INCHES NOMINAL IN |
| Distance From Center of Bore to Bottom of Keyway | 1.478 INCHES NOMINAL IN |
| Distance From Hub End to Flange End | 0.940 INCHES NOMINAL AA END IN |
| Securing Hole Quantity | 8 |
| Drilled Hole Diameter | 0.250 INCHES NOMINAL AND 0.344 INCHES NOMINAL IN |
| Keyway Width | 0.502 INCHES NOMINAL IN |
| Hole Location | ON SPROCKET FACE |
| Bore Diameter | 2.502 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| Furnished Items | COUNTERBORE AND KEYING FACILITY |
| 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 |
|---|---|
| 53X-02-221 PRIMARY | Niantic Tool, Inc. Dba Niantic Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 53X-02-221 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 53X-02-221 | 3/9 Design control — primary reference Illinois Tool Wks Inc Linac Div |
NSN 3020-01-357-7173 is a Sprocket Wheel, manufactured by Niantic Tool, Inc. Dba Niantic Tool Co, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-357-7173 has 1 manufacturer part number on file: 53X-02-221 (Niantic Tool, Inc. Dba Niantic Tool Co).
Key specifications for 53X-02-221: Hub Outside Diameter: 4.250 INCHES NOMINAL AA END IN; Securing Method: DRILLED HOLE; Bore Length: 1.810 INCHES NOMINAL IN; Design Form: PLAIN. 28 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.