The Bolt,shoulder, cataloged under National Stock Number 5306-01-476-2403, 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 16 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-476-2403 |
| Primary Part Number | MB89-4-29 |
| 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 | 2.209 INCHES NOMINAL IN |
| Shoulder Length | 1.802 INCHES MINIMUM AND 1.822 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.397 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.439 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 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 |
|---|---|
| MB89-4-29 PRIMARY | Hi-Shear Corporation (USA) |
| HP5507-4-29 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| VAL23608-4-29 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| VS3038-4-29 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M507-4-29 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 11921-4-29 | Reid Products Inc. Dba Reid Products Inc (USA) |
| S11-1062-4-29 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| MB89-4-29 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| PBF1366-4-29 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BM17019-4-29Y PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| 109451-4-29 | 3/2 Design control — primary reference U.S. Government activity |
| BM17019-4-29Y | 5/9 Secondary reference U.S. Government activity |
| VS3038-4-29 | 5/9 Secondary reference U.S. Government activity |
| ST3M507-4-29 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5306-01-476-2403 is a Bolt,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-476-2403 has 10 manufacturer part numbers on file: MB89-4-29 (Hi-Shear Corporation), HP5507-4-29 (Heartland Precision Fasteners Inc), VAL23608-4-29 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), VS3038-4-29 (Howmet Global Fastening Systems Inc), ST3M507-4-29 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace) and 5 more.
Key specifications for MB89-4-29: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 2.209 INCHES NOMINAL IN; Shoulder Length: 1.802 INCHES MINIMUM AND 1.822 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.