The Pulley,groove, cataloged under National Stock Number 3020-01-248-8939, 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 U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 29 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-248-8939 |
| Primary Part Number | 12349749 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 4.120 INCHES NOMINAL BB END IN |
| Hub Outside Diameter | 4.700 INCHES NOMINAL AA END IN |
| Bore Feature | INCLUDED |
| Securing Method | DRILLED HOLE |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 0.410 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Groove Shape | V |
| Outside Diameter | 8.480 INCHES NOMINAL IN |
| Style Designator | WEBBED OR SPOKED |
| Pitch Diameter | 8.430 INCHES NOMINAL IN |
| Groove Depth | 0.350 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Counterbore Depth | 0.140 INCHES NOMINAL IN |
| Groove Quantity | 4 |
| Counterbore Location | BB END |
| V Groove Angle in Deg | 40.2 |
| Protruding Hub Characteristic | PLAIN |
| Counterbore Diameter | 3.881 INCHES NOMINAL IN |
| Securing Hole Quantity | 9 |
| Drilled Hole Diameter | 0.551 INCHES NOMINAL AND 0.371 INCHES NOMINAL IN |
| Unable to Decode | UNABLE TO DECODE AND UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 4.830 INCHES NOMINAL AA END AND 5.330 INCHES NOMINAL BB END IN |
| Hole Location | THROUGH HUB |
| Counterbore Feature | INCLUDED |
| Bore Diameter | 2.190 INCHES NOMINAL IN |
| Unable to Decode | UNABLE TO DECODE |
| 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 |
|---|---|
| 12349749 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 3020-01-248-8939 is a Pulley,groove, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-248-8939 has 1 manufacturer part number on file: 12349749 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12349749: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 4.120 INCHES NOMINAL BB END IN; Hub Outside Diameter: 4.700 INCHES NOMINAL AA END IN; Bore Feature: INCLUDED. 29 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.