The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-357-1771, 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 13 specifications, cited from the U.S. Government catalog. The record lists 12 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-357-1771 |
| Primary Part Number | ST3M453-4-8 |
| 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 | 0.881 INCHES MINIMUM AND 0.928 INCHES MAXIMUM IN |
| Thread Length | 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| MB61-4-8 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| MB61-4-8 | Satair A/s (DNK) |
| MB61-4-8 | Hi-Shear Corporation (USA) |
| ST3M453-4-8 PRIMARY | The Boeing Company Div Defense (USA) |
| US3204-4-8 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| ST3M453-4-8 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 109453-4-8 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M453-4-8 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M453-4-8 | Huck International, Inc (USA) |
| VAL23029-4-8 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M453-4-8 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| 11825-4-8 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M453-4-8 | 5/9 Secondary reference U.S. Government activity |
| ST3M453-4-8 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| US3204-4-8 | 5/2 Secondary reference U.S. Government activity |
| 109453-4-8 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M453-4-8 | 5/9 Secondary reference M.s. Aerospace Inc. Dba Ms Aerospace Inc |
| BM17019-4-8 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BM17019-4-8 | 5/9 Secondary reference U.S. Government activity |
| ST3M453-4-8 | 5/2 Secondary reference U.S. Government activity |
| ST3M453-4-8 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
NSN 5306-00-357-1771 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-357-1771 has 12 manufacturer part numbers on file: MB61-4-8 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), MB61-4-8 (Satair A/s), MB61-4-8 (Hi-Shear Corporation), ST3M453-4-8 (The Boeing Company Div Defense), US3204-4-8 (Fairchild Fasteners Europe - Vsd Gmbh) and 7 more.
Key specifications for ST3M453-4-8: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 0.881 INCHES MINIMUM AND 0.928 INCHES MAXIMUM IN; Thread Length: 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.250 INCHES IN. 13 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.