The Bolt,machine, cataloged under National Stock Number 5306-01-503-6298, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Crane Carrier Company, Llc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5306-01-503-6298 |
| Primary Part Number | 25K4 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Crane Carrier Company, Llc |
| Status | ACTIVE |
| Extended Washer Thickness | 0.129 INCHES NOMINAL IN |
| Head Height | 0.500 INCHES NOMINAL IN |
| Fastener Length | 1.750 INCHES NOMINAL IN |
| Extended Washer Diameter | 0.750 INCHES NOMINAL IN |
| Thread Length | 1.750 INCHES NOMINAL IN |
| Material Document and Classification | SAEJ995 GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.562 INCHES NOMINAL IN |
| Surface Treatment | PHOSPHATE OVERALL |
| 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 |
|---|---|
| 21C346 | W.w. Grainger, Inc. Div Government Sales Division (USA) |
| 025K-0004 | Crane Carrier Company, Llc (USA) |
| 25K4 PRIMARY | Crane Carrier Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 25-0591 | D/9 Drawing number reference only Crane Carrier Company, Llc |
NSN 5306-01-503-6298 is a Bolt,machine, manufactured by Crane Carrier Company, Llc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-503-6298 has 3 manufacturer part numbers on file: 21C346 (W.w. Grainger, Inc. Div Government Sales Division), 025K-0004 (Crane Carrier Company, Llc), 25K4 (Crane Carrier Company, Llc).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-619-0262. Verify interchangeability with system specifications before substitution.
Key specifications for 25K4: Extended Washer Thickness: 0.129 INCHES NOMINAL IN; Head Height: 0.500 INCHES NOMINAL IN; Fastener Length: 1.750 INCHES NOMINAL IN; Extended Washer Diameter: 0.750 INCHES NOMINAL IN. 15 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.