The Bolt,shoulder, cataloged under National Stock Number 5306-01-044-2972, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 15 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through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-044-2972 |
| Primary Part Number | MB88-5-3 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Fastener Length | 0.639 INCHES MINIMUM AND 0.686 INCHES MAXIMUM IN |
| Shoulder Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.327 INCHES MINIMUM AND 0.328 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.441 INCHES MINIMUM AND 0.508 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| 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) |
| 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 |
|---|---|
| ST3M497-5-3 | J M Precision Inc (USA) |
| ST3M497-5-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MB88-5-3 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HP5497-5-3 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| VAL23607-5-3 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M497-5-3 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| S11-1061-5-3 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| PBF1254-5-3 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MB88-5-3 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| ST3M497-5-3 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M497-5-3 | 5/2 Secondary reference U.S. Government activity |
| VS3037-5-3 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| BM17019-5-3X | 5/9 Secondary reference U.S. Government activity |
| VS3037-5-3 | 5/9 Secondary reference U.S. Government activity |
| 109453-5-3X | 5/9 Secondary reference U.S. Government activity |
| MA5497-5-3 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| ST3M497-5-3 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| BM17019-5-3X | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 109450-5-3 | 3/2 Design control — primary reference U.S. Government activity |
| 109453-5-3X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5306-01-044-2972 is a Bolt,shoulder, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-044-2972 has 9 manufacturer part numbers on file: ST3M497-5-3 (J M Precision Inc), ST3M497-5-3 (Sps Technologies, Llc Dba PB Fasteners), MB88-5-3 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HP5497-5-3 (Heartland Precision Fasteners Inc), VAL23607-5-3 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 4 more.
Key specifications for MB88-5-3: Head Height: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN; Fastener Length: 0.639 INCHES MINIMUM AND 0.686 INCHES MAXIMUM IN; Shoulder Length: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.327 INCHES MINIMUM AND 0.328 INCHES MAXIMUM FIRST SHOULDER IN. 15 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.