The Bolt,shoulder, cataloged under National Stock Number 5306-01-142-9899, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-142-9899 |
| Primary Part Number | MB161-8-61 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Extended Washer Thickness | 0.062 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN |
| Head Height | 0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN |
| Fastener Length | 4.565 INCHES MINIMUM AND 4.595 INCHES MAXIMUM IN |
| Shoulder Length | 3.802 INCHES MINIMUM AND 3.822 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.922 INCHES MINIMUM AND 0.932 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.5146 INCHES MINIMUM AND 0.5151 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.742 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | SPLINE EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Head Minor Diameter | 0.644 INCHES MINIMUM AND 0.651 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| 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 |
|---|---|
| MB161-8-61 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M839-8-61 PRIMARY | The Boeing Company Div Defense (USA) |
| MB161-8-61 PRIMARY | Hi-Shear Corporation (USA) |
| VS3190-8-61X PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| VS3190-8-61X | 5/9 Secondary reference U.S. Government activity |
| 122915-8-61 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-142-9899 is a Bolt,shoulder, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-142-9899 has 4 manufacturer part numbers on file: MB161-8-61 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M839-8-61 (The Boeing Company Div Defense), MB161-8-61 (Hi-Shear Corporation), VS3190-8-61X (Howmet Global Fastening Systems Inc).
Key specifications for MB161-8-61: Extended Washer Thickness: 0.062 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN; Head Height: 0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN; Fastener Length: 4.565 INCHES MINIMUM AND 4.595 INCHES MAXIMUM IN; Shoulder Length: 3.802 INCHES MINIMUM AND 3.822 INCHES MAXIMUM FIRST SHOULDER IN. 20 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.