The Bolt,u, cataloged under National Stock Number 5306-01-184-7688, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-184-7688 |
| Primary Part Number | 5R2557 |
| Item Name | Bolt,u |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Inside Distance Between Shanks | 2.560 INCHES NOMINAL IN |
| Thread Length | 1.500 INCHES NOMINAL IN |
| Distance From Inside Center of Bend to Bolt End | 4.250 INCHES NOMINAL IN |
| Style Designator | ROUND BEND |
| Material Document and Classification | 1E357,FSC-11083 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 13 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 5R2557 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 5306-01-184-7688 is a Bolt,u, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-184-7688 has 1 manufacturer part number on file: 5R2557 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 5R2557: Inside Distance Between Shanks: 2.560 INCHES NOMINAL IN; Thread Length: 1.500 INCHES NOMINAL IN; Distance From Inside Center of Bend to Bolt End: 4.250 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.