The Bolt,shoulder, cataloged under National Stock Number 5306-01-044-5196, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-044-5196 |
| Primary Part Number | MB88-5D25 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Fastener Length | 2.013 INCHES MINIMUM AND 2.060 INCHES MAXIMUM IN |
| Shoulder Length | 1.889 INCHES MINIMUM AND 1.996 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.327 INCHES MINIMUM AND 0.328 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.440 INCHES MINIMUM AND 0.507 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 | 0.312 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 76301-ST3-497 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Width Between Flats | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.889 INCHES MINIMUM AND 1.946 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 |
|---|---|
| ST3M497-5D25 | Heartland Precision Fasteners Inc (USA) |
| MB88-5D25 PRIMARY | Hi-Shear Corporation (USA) |
| PBF1254-5D25 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| S11-1061-5D25 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| VAL23607-5D25 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MB88-5D25 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M497-5D25 | Huck International, Inc (USA) |
| ST3M497-5D25 | Howmet Global Fastening Systems Inc (USA) |
| ST3M497-5D25 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| ST3M497-5D25 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| BM17019-5D25X | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 109453-5D25X | 5/9 Secondary reference U.S. Government activity |
| 109450-5D25 | 3/2 Design control — primary reference U.S. Government activity |
| VS3037-5D25 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| MA5497-5D25 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| BM17019-5D25X | 5/9 Secondary reference U.S. Government activity |
| 109453-5D25X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| VS3037-5D25 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-044-5196 is a Bolt,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-044-5196 has 9 manufacturer part numbers on file: ST3M497-5D25 (Heartland Precision Fasteners Inc), MB88-5D25 (Hi-Shear Corporation), PBF1254-5D25 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), S11-1061-5D25 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), VAL23607-5D25 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 4 more.
Key specifications for MB88-5D25: Head Height: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN; Fastener Length: 2.013 INCHES MINIMUM AND 2.060 INCHES MAXIMUM IN; Shoulder Length: 1.889 INCHES MINIMUM AND 1.996 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.327 INCHES MINIMUM AND 0.328 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.