The Ratchet Wheel, cataloged under National Stock Number 3020-01-120-8151, 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 3 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-120-8151 |
| Primary Part Number | 123-4775391 ITEM 6 |
| Item Name | Ratchet Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.8660 INCHES IN |
| Outside Diameter | 10.5000 INCHES NOMINAL IN |
| Material | NICKEL ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 123-4775391 ITEM 6 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 87547-1124 ITEM 6 | 3/2 Design control — primary reference U.S. Government activity |
| 123-4775391 | D/9 Drawing number reference only U.S. Government activity |
| 123-4775391 ITEM 6 | 5/2 Secondary reference U.S. Government activity |
| 87547-1124 | D/9 Drawing number reference only U.S. Government activity |
NSN 3020-01-120-8151 is a Ratchet Wheel, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-120-8151 has 1 manufacturer part number on file: 123-4775391 ITEM 6 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 3020-01-120-8152, 3040-01-121-2434. Verify interchangeability with system specifications before substitution.
Key specifications for 123-4775391 ITEM 6: Bore Nominal Diameter: 2.8660 INCHES IN; Outside Diameter: 10.5000 INCHES NOMINAL IN; Special Features: RH;1.000 IN FW;2 HOLES,1.141 IN DIA EACH,2.003 IN CENTER TO CENTER DISTANCE,ON 3.254 IN BOLT CIRCLE DIA;HUB 5.000 IN OD X 2.375 IN LG IN; Material: NICKEL ALLOY. 3 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.
NSN 3020-01-120-8151 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.