The Pulley,groove, cataloged under National Stock Number 3020-01-100-4570, 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 Kidde-Fenwal, Llc. Government technical data includes 23 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. 3 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 | 3020-01-100-4570 |
| Primary Part Number | 212531 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Kidde-Fenwal, Llc |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 0.531 INCHES NOMINAL AA END IN |
| Bore Feature | INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 0.344 INCHES NOMINAL IN |
| Design Form | WEBBED |
| Web/spoke Relationship to Face Centerline | OFFSET |
| Groove Radius | 0.312 INCHES NOMINAL IN |
| Groove Shape | U |
| Outside Diameter | 1.438 INCHES NOMINAL IN |
| Style Designator | WEBBED OR SPOKED |
| Groove Depth | 0.031 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Groove Quantity | 1 |
| Unable to Decode | UNABLE TO DECODE |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.375 INCHES NOMINAL IN |
| Material | COPPER ALLOY OVERALL |
| Unable to Decode | UNABLE TO DECODE |
| Face Width | 0.344 INCHES NOMINAL IN |
| Groove Width | 0.250 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 |
|---|---|
| 212531 PRIMARY | Kidde-Fenwal, Llc (USA) |
NSN 3020-01-100-4570 is a Pulley,groove, manufactured by Kidde-Fenwal, Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-100-4570 has 1 manufacturer part number on file: 212531 (Kidde-Fenwal, Llc).
3 possible matches (shared part number, not a government interchangeability claim): 2530-01-302-2581, 6550-01-315-5331, 5330-01-721-6784. Verify interchangeability with system specifications before substitution.
Key specifications for 212531: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 0.531 INCHES NOMINAL AA END IN; Bore Feature: INCLUDED; Split Hub Feature: NOT INCLUDED. 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.