The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-478-2958, 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 17 specifications, cited from the U.S. Government catalog. The record lists 17 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-478-2958 |
| Primary Part Number | ST3M453-4-29 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 2.195 INCHES MINIMUM AND 2.241 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.397 INCHES NOMINAL IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.813 INCHES NOMINAL IN |
| Width Between Flats | 0.491 INCHES MINIMUM IN |
| Grip Diameter | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 5650 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| WC453-4-29 | West Coast Aerospace, Inc. (USA) |
| VS3204-4-29 | Howmet Global Fastening Systems Inc (USA) |
| MB61-4-29 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| S11-1060-4-29 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M453-4-29 | Houston Precision Fasteners I Lp (USA) |
| AIC753-4-29 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB61-4-29 | Hi-Shear Corporation (USA) |
| PBF1253-4-29 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| FIT7047-4-29 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| SLB252-4-29 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| 109453-4-29 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M453-4-29 PRIMARY | The Boeing Company Div Defense (USA) |
| HP5453-4-29 | Heartland Precision Fasteners Inc (USA) |
| 11825-4-29 | Reid Products Inc. Dba Reid Products Inc (USA) |
| VAL23029-4-29 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BM17019-4-29 | Huck International, Inc (USA) |
| GS1016-4-29 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| KS3020-4-29 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| 02602 | 5/9 Secondary reference U.S. Government activity |
| 109453-4-29 | 5/2 Secondary reference U.S. Government activity |
| 109453-4-29 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M453 | D/9 Drawing number reference only The Boeing Company Div Defense |
| ST3M453-4-29 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
NSN 5306-01-478-2958 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-478-2958 has 17 manufacturer part numbers on file: WC453-4-29 (West Coast Aerospace, Inc.), VS3204-4-29 (Howmet Global Fastening Systems Inc), MB61-4-29 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), S11-1060-4-29 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), ST3M453-4-29 (Houston Precision Fasteners I Lp) and 12 more.
Key specifications for ST3M453-4-29: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 2.195 INCHES MINIMUM AND 2.241 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.397 INCHES NOMINAL 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.