The Torsion Bar,suspension, cataloged under National Stock Number 2510-00-656-0591, is classified within Federal Supply Class 2510 (Vehicular Cab, Body, and Frame Structural 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 27 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 | 2510-00-656-0591 |
| Primary Part Number | 6560591 |
| Item Name | Torsion Bar,suspension |
| FSC / FSG | 2510 / 25 — Vehicular Cab, Body, and Frame Structural Components |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| FSC Application Data | TRACK SUSPENSION,COMBAT TANK |
| First End Pitch Diameter | 2.115 INCHES NOMINAL IN |
| Second End Serration Length | 0.875 INCHES NOMINAL IN |
| First End Major Diameter | 2.141 INCHES MINIMUM AND 2.145 INCHES MAXIMUM IN |
| Second End Thread Class | 1A A |
| Second End Major Diameter | 2.242 INCHES MINIMUM AND 2.246 INCHES MAXIMUM IN |
| First End Teeth Quantity | 42 |
| First End Cross-Sectional Shape | SERRATED |
| Material Document and Classification | QQ-S-624,4150H OR 8653H OR 8660H FED SPEC SINGLE MATERIAL RESPONSE |
| Outside Diameter | 1.719 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN |
| Second End Thread Direction | RIGHT-HAND |
| First End Pressure Angle in Deg | 50.00 |
| Second End Pressure Angle in Deg | 50.00 |
| Second End Thread Size | 1/2-20 |
| First End Serration Length | 1.000 INCHES NOMINAL IN |
| Second End Chamfer Length | 0.188 INCHES NOMINAL IN |
| First End Chamfer Length | 1.125 INCHES NOMINAL IN |
| Twist Direction | CLOCKWISE |
| Construction | SOLID |
| Solid Bar End Characteristic at Second End | THREADED HOLE |
| Second End Cross-Sectional Shape | SERRATED |
| Material | STEEL COMP 4150H OR STEEL COMP 8653H OR STEEL COMP 8660H |
| Second End Thread Series/type Designator | UNF |
| Second End Pitch Diameter | 2.216 INCHES NOMINAL IN |
| Second End Internal Thread Length | 0.875 INCHES NOMINAL IN |
| Second End Teeth Quantity | 44 |
| Cover | NOT PROVIDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6560591 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 2510-00-656-0591 is a Torsion Bar,suspension, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2510, Vehicular Cab, Body, and Frame Structural Components. Status: active.
NSN 2510-00-656-0591 has 1 manufacturer part number on file: 6560591 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 6560591: FSC Application Data: TRACK SUSPENSION,COMBAT TANK; First End Pitch Diameter: 2.115 INCHES NOMINAL IN; Second End Serration Length: 0.875 INCHES NOMINAL IN; First End Major Diameter: 2.141 INCHES MINIMUM AND 2.145 INCHES MAXIMUM IN. 27 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.
NSN 2510-00-656-0591 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.