The Bolt,machine, cataloged under National Stock Number 5306-00-481-6223, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 21 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-481-6223 |
| Primary Part Number | 668999 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Extended Washer Thickness | 0.070 INCHES MINIMUM IN |
| Head Height | 0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN |
| Fastener Length | 2.365 INCHES MINIMUM AND 2.385 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Thread Length | 0.375 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL |
| Hole Configuration Style | ROUND LONGITUDINAL HOLE |
| Material Document and Classification | AMS 5708 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.950 INCHES MINIMUM AND 1.990 INCHES MAXIMUM IN |
| Width Between Flats | 0.375 INCHES NOMINAL IN |
| Thread Class | 1A A |
| Thread Quantity Per Inch | 24 |
| Material | NICKEL ALLOY OVERALL |
| Hole Quantity | 4 |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.070 INCHES NOMINAL 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 |
|---|---|
| 668999 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 668999 | 5/2 Secondary reference U.S. Government activity |
| 668999 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-00-481-6223 is a Bolt,machine, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-481-6223 has 1 manufacturer part number on file: 668999 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 668999: Extended Washer Thickness: 0.070 INCHES MINIMUM IN; Head Height: 0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN; Fastener Length: 2.365 INCHES MINIMUM AND 2.385 INCHES MAXIMUM IN; Extended Washer Diameter: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN. 21 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.