The Bolt,u, cataloged under National Stock Number 5306-01-126-1056, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Drs Environmental Systems Inc. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-126-1056 |
| Primary Part Number | 56057-1 |
| Item Name | Bolt,u |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Drs Environmental Systems Inc |
| Status | ACTIVE |
| Inside Distance Between Shanks | 0.938 INCHES NOMINAL IN |
| Thread Length | 2.375 INCHES NOMINAL IN |
| Distance From Inside Center of Bend to Bolt End | 3.000 INCHES NOMINAL IN |
| Style Designator | ROUND BEND |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 56057-1 PRIMARY | Drs Environmental Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 56057-1 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5306-01-126-1056 is a Bolt,u, manufactured by Drs Environmental Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-126-1056 has 1 manufacturer part number on file: 56057-1 (Drs Environmental Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 5999-01-418-1784. Verify interchangeability with system specifications before substitution.
Key specifications for 56057-1: Inside Distance Between Shanks: 0.938 INCHES NOMINAL IN; Thread Length: 2.375 INCHES NOMINAL IN; Distance From Inside Center of Bend to Bolt End: 3.000 INCHES NOMINAL IN; Style Designator: ROUND BEND. 11 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.