The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-350-0651, 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 19 specifications, cited from the U.S. Government catalog. The record lists 14 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-350-0651 |
| Primary Part Number | MB61-4D31 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 2.318 INCHES MINIMUM AND 2.365 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.397 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | ST3-453,CAGE76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.927 INCHES MINIMUM AND 1.947 INCHES MAXIMUM IN |
| Width Between Flats | 0.439 INCHES MINIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 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) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.197 INCHES MINIMUM AND 2.254 INCHES MAXIMUM FIRST HOLE IN |
| 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 |
|---|---|
| VAL2309-4D31 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 109453-4D31 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| GS1016-4D31 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M453-4D31 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| PBF1253-4D31 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M453-4D31 | Arthur H. Thomas Company (USA) |
| MB61-4D31 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| VS3204-4D31 | Howmet Global Fastening Systems Inc (USA) |
| ST3M453-4D31 | Heartland Precision Fasteners Inc (USA) |
| AIC753-4D31 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB61-4D31 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M453-4D31 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| S353-4D31 | Huck International, Inc (USA) |
| 11825-4D31 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| VS3204-4D31 | 5/9 Secondary reference U.S. Government activity |
| BM17019-4D31 | 5/9 Secondary reference Deutsch Co the |
| ST3M453-4D31 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| ST3M453-4D31 | 5/2 Secondary reference U.S. Government activity |
| ST3M453-4D31 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| BM17019-4D31 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| S353-4D31 | 5/9 Secondary reference U.S. Government activity |
| S353-4D31 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-350-0651 is a Bolt,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-350-0651 has 14 manufacturer part numbers on file: VAL2309-4D31 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), 109453-4D31 (Sps Technologies, Llc Dba PB Fasteners), GS1016-4D31 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), ST3M453-4D31 (Fastener Innovation Technology, Inc. Dba F I T), PBF1253-4D31 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 9 more.
Key specifications for MB61-4D31: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 2.318 INCHES MINIMUM AND 2.365 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.397 INCHES NOMINAL IN. 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.