The Bolt,shoulder, cataloged under National Stock Number 5306-01-045-9520, 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 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-045-9520 |
| Primary Part Number | MB87-4-18 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Head Height | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Fastener Length | 1.578 INCHES MINIMUM AND 1.608 INCHES MAXIMUM IN |
| Shoulder Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM FIRST SHOULDER IN |
| Extended Washer Diameter | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.280 INCHES MINIMUM AND 0.281 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.493 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | 23-112,MCDONNELL DOUGLAS CORP MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.304 INCHES MINIMUM AND 0.313 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 |
|---|---|
| MB87-4-18 PRIMARY | Hi-Shear Corporation (USA) |
| MB87-4-18 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| S11-1063-4-18 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| VAL23033-4X18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| VAL23033-4-18X | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M607-4-18 | Reid Products Inc. Dba Reid Products Inc (USA) |
| BM3326-4-18Y | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| 74328-4-18Y | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 74328-4-18Y | 5/2 Secondary reference U.S. Government activity |
| VS3061-4-18 | 5/2 Secondary reference U.S. Government activity |
| BM3326-4-18Y | 5/9 Secondary reference U.S. Government activity |
| ST3M607-4-18 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5306-01-045-9520 is a Bolt,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-045-9520 has 7 manufacturer part numbers on file: MB87-4-18 (Hi-Shear Corporation), MB87-4-18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), S11-1063-4-18 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), VAL23033-4X18 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), VAL23033-4-18X (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 2 more.
Key specifications for MB87-4-18: Extended Washer Thickness: 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN; Head Height: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Fastener Length: 1.578 INCHES MINIMUM AND 1.608 INCHES MAXIMUM IN; Shoulder Length: 1.115 INCHES MINIMUM AND 1.135 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.