The Bolt,shoulder, cataloged under National Stock Number 5306-01-383-6906, 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 17 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 | 5306-01-383-6906 |
| Primary Part Number | 254-6556644FNCOTM-A8 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Head Height | 0.269 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN |
| Fastener Length | 1.661 INCHES MINIMUM AND 1.671 INCHES MAXIMUM IN |
| Shoulder Length | 1.130 INCHES MINIMUM AND 1.140 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.4370 INCHES MINIMUM AND 0.4375 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.431 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | ROUND W/WRENCH FLATS |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.620 INCHES NOMINAL IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 1018 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.750 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 |
|---|---|
| 254-6556644FNCOTM-A8 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5306-01-383-6906 is a Bolt,shoulder, manufactured by Naval Sea Systems Command, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-383-6906 has 1 manufacturer part number on file: 254-6556644FNCOTM-A8 (Naval Sea Systems Command).
Key specifications for 254-6556644FNCOTM-A8: Head Height: 0.269 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN; Fastener Length: 1.661 INCHES MINIMUM AND 1.671 INCHES MAXIMUM IN; Shoulder Length: 1.130 INCHES MINIMUM AND 1.140 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.4370 INCHES MINIMUM AND 0.4375 INCHES MAXIMUM FIRST SHOULDER IN. 17 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.