The Bolt,shoulder, cataloged under National Stock Number 5306-00-352-0663, 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 13 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-352-0663 |
| Primary Part Number | ST3M494-4-3 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN |
| Fastener Length | 0.598 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN |
| Shoulder Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.371 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DISHED HEXAGON |
| Width Between Flats | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| 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 |
|---|---|
| ST3M494-4-3 PRIMARY | The Boeing Company Div Defense (USA) |
| VS3251-4-3 | Howmet Global Fastening Systems Inc (USA) |
| ST3M494-4-3 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| S11-1065-4-3 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M494-4-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| PBF1263-4-3 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| ST3M494-4-3 | 5/2 Secondary reference U.S. Government activity |
| VS3251-4-3 | 5/2 Secondary reference U.S. Government activity |
| ST3M494-4-3 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-352-0663 is a Bolt,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-352-0663 has 6 manufacturer part numbers on file: ST3M494-4-3 (The Boeing Company Div Defense), VS3251-4-3 (Howmet Global Fastening Systems Inc), ST3M494-4-3 (Sps Technologies Ltd, Tj Brooks Division), S11-1065-4-3 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), ST3M494-4-3 (Sps Technologies, Llc Dba PB Fasteners) and 1 more.
Key specifications for ST3M494-4-3: Head Height: 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN; Fastener Length: 0.598 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN; Shoulder Length: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER 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.