The Screw,close Tolerance, cataloged under National Stock Number 5305-01-059-5916, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-059-5916 |
| Primary Part Number | BACB30FB4-3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 0.597 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN |
| Thread Length | 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP E4340 OR STEEL COMP 4340 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.350 INCHES MINIMUM AND 0.399 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 |
|---|---|
| BACB30FB4-3 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BACB30FB4-3 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30FB4-3 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BACB30FB4-3 PRIMARY | Hi-Shear Corporation (USA) |
| BACB30FB4-3 PRIMARY | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30FB4-3 PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| BACB30FB4-3 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5305-01-059-5916 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-059-5916 has 6 manufacturer part numbers on file: BACB30FB4-3 (Howmet Global Fastening Systems Inc), BACB30FB4-3 (Sps Technologies, Llc Dba PB Fasteners), BACB30FB4-3 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BACB30FB4-3 (Hi-Shear Corporation), BACB30FB4-3 (Howmet Global Fastening Systems Inc Div City of Industry Operations) and 1 more.
Key specifications for BACB30FB4-3: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 0.597 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN; Thread Length: 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN. 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.