The Bolt,shoulder, cataloged under National Stock Number 5306-01-044-8501, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 17 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through both NSN and commercial part number lookups. 12 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-044-8501 |
| Primary Part Number | VS3037-4D21 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 1.693 INCHES MINIMUM AND 1.740 INCHES MAXIMUM IN |
| Shoulder Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.264 INCHES MINIMUM AND 0.265 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 COARSE (UNC) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.572 INCHES MINIMUM AND 1.629 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 |
|---|---|
| S11-1061-4D21 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| VS3037-4D21 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M497-4D21 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MB88-4D21 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| PBF1254-4D21 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MB88-4D21 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| BM17019-4D21X | 5/9 Secondary reference U.S. Government activity |
| 109453-4D21X | 5/9 Secondary reference U.S. Government activity |
| VS3037-4D21 | 5/9 Secondary reference U.S. Government activity |
| 109450-4D21 | 5/9 Secondary reference U.S. Government activity |
| BM17019-4D21X | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| VAL23607-4D21 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| ST3M497-4D21 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| 109453-4D21X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| ST3M497-4D21 | 5/2 Secondary reference U.S. Government activity |
| MA5497-4D21 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| ST3M497-4D21 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HP5497-4D21 | 5/9 Secondary reference Heartland Precision Fasteners Inc |
NSN 5306-01-044-8501 is a Bolt,shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-044-8501 has 6 manufacturer part numbers on file: S11-1061-4D21 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), VS3037-4D21 (Howmet Global Fastening Systems Inc), ST3M497-4D21 (Sps Technologies, Llc Dba PB Fasteners), MB88-4D21 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), PBF1254-4D21 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 1 more.
Key specifications for VS3037-4D21: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 1.693 INCHES MINIMUM AND 1.740 INCHES MAXIMUM IN; Shoulder Length: 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.264 INCHES MINIMUM AND 0.265 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.