The Bolt,shear, cataloged under National Stock Number 5306-01-197-9342, 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 19 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5306-01-197-9342 |
| Primary Part Number | MB156-4-20 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.026 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN |
| Head Height | 0.194 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN |
| Fastener Length | 1.703 INCHES MINIMUM AND 1.733 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.493 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | SPLINE EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.318 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| MB156-4-20 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M753-4-20 | Houston Precision Fasteners I Lp (USA) |
| MB156-4-20 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| VFK600-4-20 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| PBF1267-4-20 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| GS1032-4-20 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| AIC763-4-20 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HP7753-4-20 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| ST3M753-4-20 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| S343-4-20 | Huck International, Inc (USA) |
| SLB255-4-20 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| ST3M753-4-20 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| 122897-4-20 | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies, Llc Dba PB Fasteners |
| VS190-4-20 | 5/9 Secondary reference U.S. Government activity |
| 10116141 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| ST3M753-4-20 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| VS3190-4-20 | 5/9 Secondary reference U.S. Government activity |
| S343-4-20 | 5/9 Secondary reference U.S. Government activity |
| 122897-4-20 | 5/2 Secondary reference U.S. Government activity |
| VS3190-4-20 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
NSN 5306-01-197-9342 is a Bolt,shear, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-197-9342 has 12 manufacturer part numbers on file: MB156-4-20 (Hi-Shear Corporation), ST3M753-4-20 (Houston Precision Fasteners I Lp), MB156-4-20 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), VFK600-4-20 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), PBF1267-4-20 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 7 more.
1 possible match (shared part number, not a government interchangeability claim): 5998-01-552-0098. Verify interchangeability with system specifications before substitution.
Key specifications for MB156-4-20: Extended Washer Thickness: 0.026 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN; Head Height: 0.194 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN; Fastener Length: 1.703 INCHES MINIMUM AND 1.733 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 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.