The Bolt,machine, cataloged under National Stock Number 5306-00-423-8408, 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 15 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. 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 | 5306-00-423-8408 |
| Primary Part Number | 1D4540 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 2.750 INCHES NOMINAL IN |
| Thread Length | 0.875 INCHES MINIMUM IN |
| Hardness Rating | 30.0 ROCKWELL C NOMINAL OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.875 INCHES NOMINAL IN |
| Width Between Flats | 0.500 INCHES NOMINAL IN |
| Minimum Yield Strength | 145000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| 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 |
NSN 5306-00-423-8408 is a Bolt,machine, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-423-8408 has 2 manufacturer part numbers on file: 1D4540 (Caterpillar Inc Div Caterpillar Defense), 1D-4540 (Pon Equipment B.v.).
1 possible match (shared part number, not a government interchangeability claim): 5306-01-158-1154. Verify interchangeability with system specifications before substitution.
Key specifications for 1D4540: Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 2.750 INCHES NOMINAL IN; Thread Length: 0.875 INCHES MINIMUM IN; Hardness Rating: 30.0 ROCKWELL C NOMINAL OVERALL. 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.