The Bolt,machine, cataloged under National Stock Number 5306-01-531-1786, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 13 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 | 5306-01-531-1786 |
| Primary Part Number | 6781961-1 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Extended Washer Thickness | 0.120 INCHES NOMINAL IN |
| Head Height | 0.370 INCHES NOMINAL IN |
| Fastener Length | 3.335 INCHES MINIMUM AND 3.395 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.812 INCHES MINIMUM AND 0.822 INCHES MAXIMUM IN |
| Thread Length | 1.875 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.617 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | TITANIUM ALLOY 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 |
|---|---|
| 6781961-1 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5306-01-531-1786 is a Bolt,machine, manufactured by Naval Sea Systems Command, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-531-1786 has 1 manufacturer part number on file: 6781961-1 (Naval Sea Systems Command).
Key specifications for 6781961-1: Extended Washer Thickness: 0.120 INCHES NOMINAL IN; Head Height: 0.370 INCHES NOMINAL IN; Fastener Length: 3.335 INCHES MINIMUM AND 3.395 INCHES MAXIMUM IN; Extended Washer Diameter: 0.812 INCHES MINIMUM AND 0.822 INCHES MAXIMUM IN. 13 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.