The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-243-2273, 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 18 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-243-2273 |
| Primary Part Number | 3M33-4-14A |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.156 INCHES NOMINAL IN |
| Fastener Length | 1.328 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN |
| Thread Length | 0.469 INCHES MAXIMUM IN |
| Hole Configuration Style | HEXAGON FLATS |
| Material Document and Classification | AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.875 INCHES NOMINAL IN |
| Width Between Flats | 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Grip Diameter | 0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.048 INCHES NOMINAL 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 |
|---|---|
| 3M33-4-14A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M33-4-14A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M33-4-14A | Howmet Global Fastening Systems Inc (USA) |
| 3M33-4-14A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M33-4-14A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M33-4-14A PRIMARY | The Boeing Company Div Defense (USA) |
| 3M33-4-14A | Tactair Fluid Controls Inc (USA) |
NSN 5306-00-243-2273 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-243-2273 has 7 manufacturer part numbers on file: 3M33-4-14A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 3M33-4-14A (Valley-Todeco, Inc. Dba Arconic Fastening Systems), 3M33-4-14A (Howmet Global Fastening Systems Inc), 3M33-4-14A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M33-4-14A (Sps Technologies, Llc Dba PB Fasteners) and 2 more.
Key specifications for 3M33-4-14A: Head Height: 0.156 INCHES NOMINAL IN; Fastener Length: 1.328 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN; Thread Length: 0.469 INCHES MAXIMUM IN; Hole Configuration Style: HEXAGON FLATS. 18 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.