The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-321-9332, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 18 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 13 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-321-9332 |
| Primary Part Number | ST3M453-5D18 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Fastener Length | 1.576 INCHES MINIMUM AND 1.623 INCHES MAXIMUM IN |
| Thread Length | 0.441 INCHES MINIMUM AND 0.508 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.312 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 | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.452 INCHES MINIMUM AND 1.509 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 |
|---|---|
| MB61-5D18 | Hi-Shear Corporation (USA) |
| VS3204-5D18 | Howmet Global Fastening Systems Inc (USA) |
| ST3M453-5D18 | Houston Precision Fasteners I Lp (USA) |
| WC453-5D18 | West Coast Aerospace, Inc. (USA) |
| MB61-5D18 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| GS1016-5D18 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| FIT7047-5D18 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HP5453-5D18 | Heartland Precision Fasteners Inc (USA) |
| BM17019-5D18 | Huck International, Inc (USA) |
| ST3M453-5D18 PRIMARY | The Boeing Company Div Defense (USA) |
| AIC753-5D18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PBF1253-5D18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| S11-1060-5D18 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M453-5D18 | M.s. Aerospace Inc. Dba Ms Aerospace Inc (USA) |
| 109453-5D18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VAL23029-5D18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 11825-5D18 | Reid Products Inc. Dba Reid Products Inc (USA) |
| SLB252-5D18 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| Reference | Meaning |
|---|---|
| ST3M453-5D-18 | 5/9 Secondary reference Fastener Innovation Technology, Inc. Dba F I T |
| ST3M453-5D-18 | 5/9 Secondary reference Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries |
| ST3M453-5D-18 | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| ST3M453-5D-18 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| ST3M453-5D-18 | 5/9 Secondary reference U.S. Government activity |
| ST3M453-5D-18 | 5/9 Secondary reference Heartland Precision Fasteners Inc |
| ST3M453-5D-18 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| KS3020-5D18 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| US3204-5D18 | 5/9 Secondary reference U.S. Government activity |
| 109453-5D18 | 5/2 Secondary reference U.S. Government activity |
| BM17019-5D18 | 5/9 Secondary reference U.S. Government activity |
| 109453-5D18 | 5/9 Secondary reference Sps Technologies Inc |
| VS3204-5D18 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-00-321-9332 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-321-9332 has 18 manufacturer part numbers on file: MB61-5D18 (Hi-Shear Corporation), VS3204-5D18 (Howmet Global Fastening Systems Inc), ST3M453-5D18 (Houston Precision Fasteners I Lp), WC453-5D18 (West Coast Aerospace, Inc.), MB61-5D18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 13 more.
Key specifications for ST3M453-5D18: Head Height: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN; Fastener Length: 1.576 INCHES MINIMUM AND 1.623 INCHES MAXIMUM IN; Thread Length: 0.441 INCHES MINIMUM AND 0.508 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN. 16 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.