The Bolt,shoulder, cataloged under National Stock Number 5306-01-045-9521, 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 16 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-045-9521 |
| Primary Part Number | ST3M607-4-27 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Extended Washer Thickness | 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Head Height | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Fastener Length | 2.141 INCHES MINIMUM AND 2.171 INCHES MAXIMUM IN |
| Shoulder Length | 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM FIRST SHOULDER IN |
| Extended Washer Diameter | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.280 INCHES MINIMUM AND 0.281 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.493 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.304 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| ST3M607-4-27 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M607-4-27 PRIMARY | The Boeing Company Div Defense (USA) |
| VAL23033-4X27 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M607-4-27 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| VS3061-4-27 | 5/2 Secondary reference U.S. Government activity |
| 74328-4-27Y | 5/9 Secondary reference U.S. Government activity |
| BM3326-4-27Y | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 74328-4-27Y | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BM3326-4-27Y | 5/9 Secondary reference U.S. Government activity |
| MB87-4-27 | 5/9 Secondary reference Hi-Shear Corporation |
NSN 5306-01-045-9521 is a Bolt,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-045-9521 has 4 manufacturer part numbers on file: ST3M607-4-27 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M607-4-27 (The Boeing Company Div Defense), VAL23033-4X27 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M607-4-27 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
Key specifications for ST3M607-4-27: Extended Washer Thickness: 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN; Head Height: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Fastener Length: 2.141 INCHES MINIMUM AND 2.171 INCHES MAXIMUM IN; Shoulder Length: 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM FIRST SHOULDER IN. 16 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.