The Bolt,shoulder, cataloged under National Stock Number 5306-01-141-7889, 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 11 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-141-7889 |
| Primary Part Number | MB88-3-50 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Fastener Length | 3.440 INCHES MINIMUM AND 3.487 INCHES MAXIMUM IN |
| Shoulder Length | 3.115 INCHES MINIMUM AND 3.135 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2021 INCHES MINIMUM AND 0.2026 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.305 INCHES MINIMUM AND 0.372 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.376 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| 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 |
|---|---|
| S11-1061-3-50 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M497-3-50 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| MB88-3-50 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M497-3-50 | Huck International, Inc (USA) |
| PBF1254-3-50 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MB88-3-50 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HP5497-3-50 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| ST3M497-3-50 | Heartland Precision Fasteners Inc (USA) |
| ST3M497-3-50 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M497-3-50 | J M Precision Inc (USA) |
| VAL23607-3-50 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| ST3M497-3-50 | 5/9 Secondary reference Sps Technologies Inc |
| BM17019-3-50X | 5/9 Secondary reference U.S. Government activity |
| VS3037-3-50 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| BM17019-3-50X | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| MA5497-3-50 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| 109450-3-50 | 3/2 Design control — primary reference U.S. Government activity |
| 109450-3-50 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| VS3037-3-50 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-141-7889 is a Bolt,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-141-7889 has 11 manufacturer part numbers on file: S11-1061-3-50 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), ST3M497-3-50 (Fastener Innovation Technology, Inc. Dba F I T), MB88-3-50 (Hi-Shear Corporation), ST3M497-3-50 (Huck International, Inc), PBF1254-3-50 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 6 more.
Key specifications for MB88-3-50: Head Height: 0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN; Fastener Length: 3.440 INCHES MINIMUM AND 3.487 INCHES MAXIMUM IN; Shoulder Length: 3.115 INCHES MINIMUM AND 3.135 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.