The Bolt,machine, cataloged under National Stock Number 5306-01-251-4991, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Rolls-Royce Solutions America Inc. Government technical data includes 20 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-251-4991 |
| Primary Part Number | 9427997 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rolls-Royce Solutions America Inc |
| Status | ACTIVE |
| Head Height | 0.375 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN |
| Fastener Length | 5.900 INCHES MINIMUM AND 6.000 INCHES MAXIMUM IN |
| Thread Length | 1.500 INCHES NOMINAL IN |
| Supplementary Features | MFR TYPE AA HEX. LOCK BOLT; U/O DETROIT DIESEL 149 ENGINE MARINE GEAR |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | SAE J429,GRADE 8 UNS G15410 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | DISTORTED HEAD |
| Thread Direction | RIGHT-HAND |
| Departure From Cited Designator | AS MODIFIED BY PLAIN FIN. |
| Specification/standard Data | 81349-MIL-B-45912 GOVERNMENT SPECIFICATION AND 24617-9427997 MANUFACTURERS STANDARD |
| Width Between Flats | 0.860 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | B COMPOSITION |
| Locking Feature | UNDERCUT BEARING SURFACE OF HEAD |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 9427997 | Rolls-Royce Solutions America Inc (USA) |
| Reference | Meaning |
|---|---|
| 9427997 | 3/9 Design control — primary reference General Motors Corp |
| 5306PL0948534 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| MIL-B-45912 | 4/1 Identification reference U.S. Government activity |
NSN 5306-01-251-4991 is a Bolt,machine, manufactured by Rolls-Royce Solutions America Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-251-4991 has 1 manufacturer part number on file: 9427997 (Rolls-Royce Solutions America Inc).
Key specifications for 9427997: Head Height: 0.375 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN; Fastener Length: 5.900 INCHES MINIMUM AND 6.000 INCHES MAXIMUM IN; Thread Length: 1.500 INCHES NOMINAL IN; Supplementary Features: MFR TYPE AA HEX. LOCK BOLT; U/O DETROIT DIESEL 149 ENGINE MARINE GEAR. 20 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.