The Bolt,shoulder, cataloged under National Stock Number 5306-01-044-2995, 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 17 specifications, cited from the U.S. Government catalog. The record lists 12 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-044-2995 |
| Primary Part Number | MB88-4D27 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 2.069 INCHES MINIMUM AND 2.116 INCHES MAXIMUM IN |
| Shoulder Length | 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2646 INCHES MINIMUM AND 0.2652 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 | 1.948 INCHES MINIMUM AND 2.005 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 |
|---|---|
| ST3M497-4D27 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB88-4D27 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M497-4D27 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| PBF1254-4D27 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| WC497-4D27 | West Coast Aerospace, Inc. (USA) |
| S11-1061-4D27 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| VAL23607-4D27 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MB88-4D27 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M497-4D27 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HP5497-4D27 | Heartland Precision Fasteners Inc (USA) |
| ST3M497-4D27 | Houston Precision Fasteners I Lp (USA) |
| 11915-4D27 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| BM17019-4D27X | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| ST3M497-4D27 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| VS3037-4D27 | 5/9 Secondary reference U.S. Government activity |
| 109453-4D27X | 5/9 Secondary reference U.S. Government activity |
| VS3037-4D27 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| 109450-4D27 | 3/2 Design control — primary reference U.S. Government activity |
| 109453-4D27X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| MA5497-4D27 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| BM17019-4D27X | 5/9 Secondary reference U.S. Government activity |
| ST3M497-4D27 | 5/9 Secondary reference Heartland Precision Fasteners Inc |
NSN 5306-01-044-2995 is a Bolt,shoulder, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-044-2995 has 12 manufacturer part numbers on file: ST3M497-4D27 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), MB88-4D27 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M497-4D27 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), PBF1254-4D27 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), WC497-4D27 (West Coast Aerospace, Inc.) and 7 more.
Key specifications for MB88-4D27: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 2.069 INCHES MINIMUM AND 2.116 INCHES MAXIMUM IN; Shoulder Length: 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2646 INCHES MINIMUM AND 0.2652 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.