The Spider,differential, cataloged under National Stock Number 2520-01-170-4990, is classified within Federal Supply Class 2520 (Vehicular Power Transmission Components) of the Vehicular Equipment Components group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2520-01-170-4990 |
| Primary Part Number | 8380940 |
| Item Name | Spider,differential |
| FSC / FSG | 2520 / 25 — Vehicular Power Transmission Components |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Hub Outside Diameter | 2.614 INCHES NOMINAL IN |
| Hub Bore Diameter | 1.312 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN |
| Arm Length | 1.633 INCHES NOMINAL IN |
| Length Across Arms | 5.880 INCHES NOMINAL IN |
| Material | STEEL |
| Arm Diameter | 1.307 INCHES NOMINAL IN |
| Hub Thickness | 0.047 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 8380940 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 2520011704990 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
NSN 2520-01-170-4990 is a Spider,differential, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2520, Vehicular Power Transmission Components. Status: active.
NSN 2520-01-170-4990 has 1 manufacturer part number on file: 8380940 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8380940: Hub Outside Diameter: 2.614 INCHES NOMINAL IN; Hub Bore Diameter: 1.312 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN; Arm Length: 1.633 INCHES NOMINAL IN; Length Across Arms: 5.880 INCHES NOMINAL IN. 7 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.