The Screw,close Tolerance, cataloged under National Stock Number 5305-01-238-5833, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc Div City of Industry Operations. Government technical data includes 20 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-238-5833 |
| Primary Part Number | BACB30VF4K12 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc Div City of Industry Operations |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 1.110 INCHES MINIMUM AND 1.130 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | BMS10-85 TYPE 1 CAGE 81205 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.355 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Material Document and Classification | AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| Minimum Tensile Strength | 95000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.364 INCHES MINIMUM AND 0.397 INCHES MAXIMUM 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 |
|---|---|
| BACB30VF4K12 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30VF4K12 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BACB30VF4K12 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30VF4K12 | Howmet Global Fastening Systems Inc (USA) |
| BACB30VF4K12 | Huck International, Inc (USA) |
| BACB30VF4K12 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| BACB30VF4K12 | 5/9 Secondary reference Sps Technologies Inc |
| BACB30VF4K12 | 5/9 Secondary reference U.S. Government activity |
| BACB30VF4K12 | 5/9 Secondary reference U.S. Government activity |
| BACB30VF4K12 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-238-5833 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc Div City of Industry Operations, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-238-5833 has 6 manufacturer part numbers on file: BACB30VF4K12 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30VF4K12 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BACB30VF4K12 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30VF4K12 (Howmet Global Fastening Systems Inc), BACB30VF4K12 (Huck International, Inc) and 1 more.
Key specifications for BACB30VF4K12: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 1.110 INCHES MINIMUM AND 1.130 INCHES MAXIMUM IN; Surface Treatment Document and Classification: BMS10-85 TYPE 1 CAGE 81205 MFR REF SINGLE TREATMENT RESPONSE OVERALL. 20 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.