The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-077-9919, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-077-9919 |
| Primary Part Number | 121933-4-18 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Head Height | 0.164 INCHES NOMINAL IN |
| Fastener Length | 1.473 INCHES MINIMUM AND 1.493 INCHES MAXIMUM IN |
| Thread Length | 0.358 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 | 1.115 INCHES MINIMUM AND 1.135 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 |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.355 INCHES MINIMUM AND 1.375 INCHES MAXIMUM ALL HOLES 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 |
|---|---|
| ST3M750-4-18 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| ST3M750-4-18 | Huck International, Inc (USA) |
| ST3M750-4-18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M750-4-18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M750-4-18 | Howmet Global Fastening Systems Inc (USA) |
| ST3M750-4-18 | Heartland Precision Fasteners Inc (USA) |
| ST3M750-4-18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M750-4-18 | The Boeing Company Div Defense (USA) |
| ST3M750-4-18 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M750-4-18 | West Coast Aerospace, Inc. (USA) |
| 121933-4-18 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M750-4-18 | Houston Precision Fasteners I Lp (USA) |
| ST3M750-4-18 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M750-4-18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M750-4-18 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| ST3M750-4-18 | 5/2 Secondary reference U.S. Government activity |
| ST3M750-4-18 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-077-9919 is a Bolt,close Tolerance, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-077-9919 has 15 manufacturer part numbers on file: ST3M750-4-18 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), ST3M750-4-18 (Huck International, Inc), ST3M750-4-18 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M750-4-18 (Sps Technologies, Llc Dba PB Fasteners), ST3M750-4-18 (Howmet Global Fastening Systems Inc) and 10 more.
Key specifications for 121933-4-18: Head Height: 0.164 INCHES NOMINAL IN; Fastener Length: 1.473 INCHES MINIMUM AND 1.493 INCHES MAXIMUM IN; Thread Length: 0.358 INCHES NOMINAL IN; Material Document and Classification: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.