The Bolt,shoulder, cataloged under National Stock Number 5306-01-044-2984, 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 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-044-2984 |
| Primary Part Number | MB88-4-27 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| 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 | 0.264 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 |
| 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) |
| 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 |
|---|---|
| MB88-4-27 PRIMARY | Hi-Shear Corporation (USA) |
| VAL23607-4-27 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| S11-1061-4-27 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| MB88-4-27 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HP5497-4-27 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| PBF1254-4-27 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MA5497-4-27 | Abounding Security Inc Div of Maa Corp (USA) |
| 11915-4-27 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M497-4-27 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| VS3037-4-27 | 5/9 Secondary reference U.S. Government activity |
| 109453-4-27X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 109453-4-27X | 5/9 Secondary reference U.S. Government activity |
| 109450-4-27 | 3/2 Design control — primary reference U.S. Government activity |
| BM17019-4-27X | 5/9 Secondary reference U.S. Government activity |
| ST3M497-4-27 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5306-01-044-2984 is a Bolt,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-044-2984 has 9 manufacturer part numbers on file: MB88-4-27 (Hi-Shear Corporation), VAL23607-4-27 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), S11-1061-4-27 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), MB88-4-27 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HP5497-4-27 (Heartland Precision Fasteners Inc) and 4 more.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-499-7686. Verify interchangeability with system specifications before substitution.
Key specifications for MB88-4-27: 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: 0.264 INCHES MINIMUM AND 0.265 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.