The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-478-2953, 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 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-478-2953 |
| Primary Part Number | ST3M453-4-25 |
| 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 | 1.945 INCHES MINIMUM AND 1.991 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 | 1.563 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 |
|---|---|
| VS3204-4-25 | Howmet Global Fastening Systems Inc (USA) |
| 109453-4-25 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M453-4-25 PRIMARY | The Boeing Company Div Defense (USA) |
| AIC753-4-25 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 11825-4-25 | Reid Products Inc. Dba Reid Products Inc (USA) |
| VAL23029-4-25 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MB61-4-25 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HP5453-4-25 | Heartland Precision Fasteners Inc (USA) |
| MB61-4-25 | Hi-Shear Corporation (USA) |
| S11-1060-4-25 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| FIT7047-4-25 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| BM17019-4-25 | Huck International, Inc (USA) |
| PBF1253-4-25 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| KS3020-4-25 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| 109453-4-25 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M453 | D/9 Drawing number reference only The Boeing Company Div Defense |
| 109453-4-25 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-478-2953 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-478-2953 has 13 manufacturer part numbers on file: VS3204-4-25 (Howmet Global Fastening Systems Inc), 109453-4-25 (Sps Technologies, Llc Dba PB Fasteners), ST3M453-4-25 (The Boeing Company Div Defense), AIC753-4-25 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 11825-4-25 (Reid Products Inc. Dba Reid Products Inc) and 8 more.
3 possible matches (shared part number, not a government interchangeability claim): 5306-01-478-2955, 5306-01-478-2957, 5306-01-478-2958. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M453-4-25: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 1.945 INCHES MINIMUM AND 1.991 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.