The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-903-7408, 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 14 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-903-7408 |
| Primary Part Number | 3M33-4H12 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN |
| Fastener Length | 1.219 INCHES NOMINAL IN |
| Thread Length | 0.459 INCHES MINIMUM AND 0.479 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM 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 |
| 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 |
|---|---|
| 3M33-4H12 PRIMARY | The Boeing Company Div Defense (USA) |
| 3M33-4H12 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M33-4H12 | Howmet Global Fastening Systems Inc (USA) |
| 3M33-4H12 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M33-4H12 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M33-4H12 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| 3M33-4H12 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-00-903-7408 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-903-7408 has 6 manufacturer part numbers on file: 3M33-4H12 (The Boeing Company Div Defense), 3M33-4H12 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 3M33-4H12 (Howmet Global Fastening Systems Inc), 3M33-4H12 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M33-4H12 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 1 more.
Key specifications for 3M33-4H12: Head Height: 0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN; Fastener Length: 1.219 INCHES NOMINAL IN; Thread Length: 0.459 INCHES MINIMUM AND 0.479 INCHES MAXIMUM IN; Material Document and Classification: AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 14 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.