The Screw,close Tolerance, cataloged under National Stock Number 5305-01-433-4093, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-433-4093 |
| Primary Part Number | 3M1231-2 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.080 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN |
| Fastener Length | 2.400 INCHES MINIMUM AND 2.420 INCHES MAXIMUM IN |
| Thread Length | 0.830 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.580 INCHES NOMINAL IN |
| Width Between Flats | 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN |
| Grip Diameter | 0.115 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 16000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | W/O INTERNAL DRIVE |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNJC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5305-01-433-4093 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-433-4093 has 4 manufacturer part numbers on file: 3M1231-2 (The Boeing Company Div Defense), 3M1231-2 (Howmet Global Fastening Systems Inc), 3M1231-2 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M1231-2 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 3M1231-2: Head Height: 0.080 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN; Fastener Length: 2.400 INCHES MINIMUM AND 2.420 INCHES MAXIMUM IN; Thread Length: 0.830 INCHES NOMINAL IN; Nominal Thread Diameter: 0.138 INCHES IN. 15 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.