The Washer,spring Tension, cataloged under National Stock Number 5310-01-156-5455, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rockford Powertrain Inc Div Powertrain Rockford, Inc.. Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-156-5455 |
| Primary Part Number | 2-21243 |
| Item Name | Washer,spring Tension |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rockford Powertrain Inc Div Powertrain Rockford, Inc. |
| Status | ACTIVE |
| Outside Diameter | 4.750 INCHES NOMINAL IN |
| Material | STEEL COMP 1070 OVERALL |
| 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 |
|---|---|
| 2AT289 | Oshkosh Defense Llc (USA) |
| 2-21243 PRIMARY | Rockford Powertrain Inc Div Powertrain Rockford, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 2-829-069-21243 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 2AT289 | 5/9 Secondary reference Oshkosh Corp |
NSN 5310-01-156-5455 is a Washer,spring Tension, manufactured by Rockford Powertrain Inc Div Powertrain Rockford, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-156-5455 has 2 manufacturer part numbers on file: 2AT289 (Oshkosh Defense Llc), 2-21243 (Rockford Powertrain Inc Div Powertrain Rockford, Inc.).
Key specifications for 2-21243: Outside Diameter: 4.750 INCHES NOMINAL IN; Material: STEEL COMP 1070 OVERALL. 2 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.