The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-550-3946, 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 12 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 | 5306-01-550-3946 |
| Primary Part Number | 133-6270 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Head Height | 6.2 MILLIMETERS NOMINAL MM |
| Fastener Length | 38.1 MILLIMETERS NOMINAL MM |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 2.4 MILLIMETERS NOMINAL MM |
| Width Between Flats | 12.7 MILLIMETERS NOMINAL MM |
| Surface Treatment | PHOSPHATE OVERALL |
| Minimum Tensile Strength | 1035 MEGAPASCALS |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 133-6270 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 5306-01-550-3946 is a Bolt,close Tolerance, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-550-3946 has 1 manufacturer part number on file: 133-6270 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 133-6270: Head Height: 6.2 MILLIMETERS NOMINAL MM; Fastener Length: 38.1 MILLIMETERS NOMINAL MM; Nominal Thread Diameter: 0.312 INCHES IN; Head Style: HEXAGON. 12 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.