The Carrier,torque Converter, cataloged under National Stock Number 2520-00-421-3856, is classified within Federal Supply Class 2520 (Vehicular Power Transmission Components) of the Vehicular Equipment Components group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2520-00-421-3856 |
| Primary Part Number | 1T0305 |
| Item Name | Carrier,torque Converter |
| FSC / FSG | 2520 / 25 — Vehicular Power Transmission Components |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| General Characteristics Item Description | 2 EQUALLY SPACED 0.126 TO 0.130 IN. W GROOVES CUT INTO OD SURFACE 0.312 TO 0.324 IN.DEEP W/GROOVE SIDES HAVING 63 MICROINCH FINISH IN |
| General Characteristics Item Description | BOTH SIDES OF BORE W/CHAMFER 0.12 BY 45 DEG AND BOTH SIDES OF OD CHAMFERED ON OUTSIDE EDGES 0.06 IN.BY 30 DEG IN |
| General Characteristics Item Description | CAST IRON,4.476 TO 4.480 IN.OD,3.5430 TO 3.5460 IN.ID,0.518 TO 0.522 IN. W IN |
| General Characteristics Item Description | FINISH ALL OVER 0.00 TO 0.12 IN. IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
NSN 2520-00-421-3856 is a Carrier,torque Converter, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 2520, Vehicular Power Transmission Components. Status: active.
NSN 2520-00-421-3856 has 2 manufacturer part numbers on file: 1T0305 (Caterpillar Inc Div Caterpillar Defense), 201982R (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
Key specifications for 1T0305: General Characteristics Item Description: 2 EQUALLY SPACED 0.126 TO 0.130 IN. W GROOVES CUT INTO OD SURFACE 0.312 TO 0.324 IN.DEEP W/GROOVE SIDES HAVING 63 MICROINCH FINISH IN; General Characteristics Item Description: BOTH SIDES OF BORE W/CHAMFER 0.12 BY 45 DEG AND BOTH SIDES OF OD CHAMFERED ON OUTSIDE EDGES 0.06 IN.BY 30 DEG IN; General Characteristics Item Description: CAST IRON,4.476 TO 4.480 IN.OD,3.5430 TO 3.5460 IN.ID,0.518 TO 0.522 IN. W IN; General Characteristics Item Description: FINISH ALL OVER 0.00 TO 0.12 IN. IN. 4 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.