The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-254-4366, 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 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-254-4366 |
| Primary Part Number | ST3M453-8D21 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN |
| Fastener Length | 1.945 INCHES MINIMUM AND 1.992 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN |
| Width Between Flats | 0.752 INCHES MAXIMUM IN |
| Grip Diameter | 0.4990 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 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) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.817 INCHES MINIMUM AND 1.874 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 |
|---|---|
| 11825-8D21 | Reid Products Inc. Dba Reid Products Inc (USA) |
| 109453-8D21 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| GS1016-8D21 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| BM17019-8D21 | Huck International, Inc (USA) |
| MB61-8D21 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M453-8D21 | M.s. Aerospace Inc. Dba Ms Aerospace Inc (USA) |
| S11-1060-8D21 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| AIC753-8D21 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PBF1253-8D21 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M453-8D21 PRIMARY | The Boeing Company Div Defense (USA) |
| S353-8D21 | Huck International, Inc (USA) |
| MB61-8D21 | Hi-Shear Corporation (USA) |
| VS3204-8D21 | Howmet Global Fastening Systems Inc (USA) |
| VAL23029-8D21 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| ST3M453-8D21 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| VS3204-8D21 | 5/9 Secondary reference U.S. Government activity |
| ST3M453-8D21 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| ST3M453-8D21 | 5/2 Secondary reference U.S. Government activity |
| MA5453-8D21 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| KS3020-8D21 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| BM17019-8D21 | 5/9 Secondary reference U.S. Government activity |
| S353-8D21 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-254-4366 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-254-4366 has 14 manufacturer part numbers on file: 11825-8D21 (Reid Products Inc. Dba Reid Products Inc), 109453-8D21 (Sps Technologies, Llc Dba PB Fasteners), GS1016-8D21 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), BM17019-8D21 (Huck International, Inc), MB61-8D21 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 9 more.
Key specifications for ST3M453-8D21: Head Height: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN; Fastener Length: 1.945 INCHES MINIMUM AND 1.992 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.623 INCHES MINIMUM AND 0.690 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.