The Bolt,shoulder, cataloged under National Stock Number 5306-01-044-2991, 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 17 specifications, cited from the U.S. Government catalog. The record lists 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 16 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-044-2991 |
| Primary Part Number | ST3M497-4D8 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 0.881 INCHES MINIMUM AND 0.928 INCHES MAXIMUM IN |
| Shoulder Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 76301-ST3-497 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.760 INCHES MINIMUM AND 0.817 INCHES MAXIMUM FIRST HOLE 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 |
|---|---|
| ST3M497-4D8 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M497-4D8 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M497-4D8 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M497-4D8 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M497-4D8 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M497-4D8 | Hi-Shear Corporation (USA) |
| ST3M497-4D8 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M497-4D8 | J M Precision Inc (USA) |
| ST3M497-4D8 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| S11-1061-4D8 | 5/9 Secondary reference Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries |
| VAL23607-4D8 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| VS3037-4D8 | 5/9 Secondary reference U.S. Government activity |
| PBF1254-4D8 | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| VS3037-4D8 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| MA5497-4D8 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| HP5497-4D8 | 5/9 Secondary reference Heartland Precision Fasteners Inc |
| 109453-4D8X | 5/9 Secondary reference U.S. Government activity |
| 109450-4D8 | 5/9 Secondary reference U.S. Government activity |
| BM17019-4D8X | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BM17019-4D8X | 5/9 Secondary reference U.S. Government activity |
| 109450-4D8 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| ST3M497-4D8 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| 109453-4D8X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| ST3M497-4D8 | 5/2 Secondary reference U.S. Government activity |
| MB88-4D8 | 5/9 Secondary reference Hi-Shear Corporation |
NSN 5306-01-044-2991 is a Bolt,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-044-2991 has 9 manufacturer part numbers on file: ST3M497-4D8 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M497-4D8 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), ST3M497-4D8 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M497-4D8 (Sps Technologies, Llc Dba PB Fasteners), ST3M497-4D8 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace) and 4 more.
Key specifications for ST3M497-4D8: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 0.881 INCHES MINIMUM AND 0.928 INCHES MAXIMUM IN; Shoulder Length: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2646 INCHES MINIMUM AND 0.2651 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.