The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-559-5481, 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 13 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-559-5481 |
| Primary Part Number | MB61-6D18 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.200 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN |
| Fastener Length | 1.625 INCHES MINIMUM AND 1.672 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.490 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MAXIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 08524-B-17019 MANUFACTURERS STANDARD |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Width Between Flats | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.500 INCHES MINIMUM AND 1.557 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 |
|---|---|
| MB61-6D18 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M453-6D18 | Howmet Global Fastening Systems Inc (USA) |
| ST3M453-6D18 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M453-6D18 | Heartland Precision Fasteners Inc (USA) |
| ST3M453-6D18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M453-6D18 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| 11825-6D18 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M453-6D18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M453-6D18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MB61-6D18 PRIMARY | Hi-Shear Corporation (USA) |
| GS1016-6D18 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| BM17019-6D18 PRIMARY | Huck International, Inc (USA) |
| ST3M453-6D18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BM17019-6D18 | 5/9 Secondary reference U.S. Government activity |
| 109453-6D18 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 109453-6D18 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M453-6D18 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5306-00-559-5481 is a Bolt,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-559-5481 has 13 manufacturer part numbers on file: MB61-6D18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M453-6D18 (Howmet Global Fastening Systems Inc), ST3M453-6D18 (Fastener Innovation Technology, Inc. Dba F I T), ST3M453-6D18 (Heartland Precision Fasteners Inc), ST3M453-6D18 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 8 more.
Key specifications for MB61-6D18: Head Height: 0.200 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN; Fastener Length: 1.625 INCHES MINIMUM AND 1.672 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.490 INCHES MINIMUM AND 0.557 INCHES MAXIMUM 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.