The Bolt,internal Wrenching, cataloged under National Stock Number 5306-00-783-4778, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 16 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 | 5306-00-783-4778 |
| Primary Part Number | 32-31840-3 |
| Item Name | Bolt,internal Wrenching |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Width Across Flats | 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Head Height | 0.460 INCHES NOMINAL IN |
| Fastener Length | 1.617 INCHES NOMINAL IN |
| Thread Length | 1.081 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.062 INCHES MINIMUM AND 0.065 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 4140 OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.085 INCHES MINIMUM AND 0.115 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.773 INCHES MINIMUM AND 0.774 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 32-31840-3 PRIMARY | The Boeing Company Div Defense (USA) |
NSN 5306-00-783-4778 is a Bolt,internal Wrenching, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-783-4778 has 1 manufacturer part number on file: 32-31840-3 (The Boeing Company Div Defense).
Key specifications for 32-31840-3: Width Across Flats: 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Head Height: 0.460 INCHES NOMINAL IN; Fastener Length: 1.617 INCHES NOMINAL IN; Thread Length: 1.081 INCHES NOMINAL IN. 16 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.