The Pulley,groove, cataloged under National Stock Number 3020-01-233-5053, 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 Ralmark Co. Government technical data includes 19 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-233-5053 |
| Primary Part Number | 8-2180A |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Ralmark Co |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Bore Feature | INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 0.500 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Groove Radius | 0.140 INCHES NOMINAL IN |
| Groove Shape | U |
| Outside Diameter | 3.625 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Groove Depth | 0.311 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Groove Quantity | 1 |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY OVERALL |
| Face Width | 0.500 INCHES NOMINAL IN |
| Groove Width | 0.316 INCHES NOMINAL IN |
| Lightening Hole | NOT INCLUDED |
| 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 |
|---|---|
| 8-2180A PRIMARY | Ralmark Co (USA) |
| Reference | Meaning |
|---|---|
| 8-2180AA | C/1 Advisory reference — outside the item-of-supply concept Ralmark Co |
NSN 3020-01-233-5053 is a Pulley,groove, manufactured by Ralmark Co, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-233-5053 has 1 manufacturer part number on file: 8-2180A (Ralmark Co).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-250-1014. Verify interchangeability with system specifications before substitution.
Key specifications for 8-2180A: Integral Cooling Vane: NOT INCLUDED; Bore Feature: INCLUDED; Split Hub Feature: NOT INCLUDED; Bore Length: 0.500 INCHES NOMINAL IN. 19 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.