The Pulley,groove, cataloged under National Stock Number 3020-00-125-1002, 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 Piper Industrial Manufacturing Company, Llc Div Piper Industrial Manufacturing Company. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 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 | 3020-00-125-1002 |
| Primary Part Number | 40991 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Piper Industrial Manufacturing Company, Llc Div Piper Industrial Manufacturing Company |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Bore Feature | INCLUDED |
| Bearing Quantity | 1 |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 0.344 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Groove Radius | 0.094 INCHES NOMINAL IN |
| Outside Diameter | 2.750 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Groove Depth | 0.188 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | INCLUDED |
| Groove Quantity | 1 |
| Bearing Type | BUSHING |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Material | COPPER ALLOY HUB |
| Material | PLASTIC RIM |
| Face Width | 0.344 INCHES NOMINAL IN |
| Groove Width | 0.219 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 |
NSN 3020-00-125-1002 is a Pulley,groove, manufactured by Piper Industrial Manufacturing Company, Llc Div Piper Industrial Manufacturing Company, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-125-1002 has 2 manufacturer part numbers on file: 40991-00 (Piper Industrial Manufacturing Company, Llc Div Piper Industrial Manufacturing Company), 40991 (Piper Industrial Manufacturing Company, Llc Div Piper Industrial Manufacturing Company).
5 possible matches (shared part number, not a government interchangeability claim): 2925-00-805-6481, 4820-00-894-7115, 4820-01-260-2066. Verify interchangeability with system specifications before substitution.
Key specifications for 40991: Integral Cooling Vane: NOT INCLUDED; Bore Feature: INCLUDED; Bearing Quantity: 1; Split Hub Feature: NOT INCLUDED. 21 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.