The Screw,close Tolerance, cataloged under National Stock Number 5305-01-059-3589, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Valley-Todeco, Inc. Dba Arconic Fastening Systems. 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-059-3589 |
| Primary Part Number | BACB30LH4U3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 0.562 INCHES MINIMUM AND 0.592 INCHES MAXIMUM IN |
| Thread Length | 0.364 INCHES MINIMUM AND 0.414 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 81205-BACB30LH MANUFACTURERS STANDARD |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.455 INCHES MINIMUM AND 0.510 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 |
|---|---|
| BACB30LH4U3 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LH4U3 PRIMARY | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30LH4U3 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LH4U3 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LH4U3 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LH4U3 PRIMARY | Federal Manufacturing Corp (USA) |
| Reference | Meaning |
|---|---|
| BACB30LH4U3 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| BACB30LH4U3 | 5/9 Secondary reference U.S. Government activity |
| BACB30LH4U3 | 5/9 Secondary reference Huck International, Inc |
| BACB30LH4U3 | 7/2 Vendor item drawing reference U.S. Government activity |
| BACB30LH4U3 | 5/9 Secondary reference Voi-Shan/chatsworth Div of Vsi Corp Sub of Fairchild Industries Inc |
NSN 5305-01-059-3589 is a Screw,close Tolerance, manufactured by Valley-Todeco, Inc. Dba Arconic Fastening Systems, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-059-3589 has 6 manufacturer part numbers on file: BACB30LH4U3 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), BACB30LH4U3 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30LH4U3 (Sps Technologies, Llc Dba PB Fasteners), BACB30LH4U3 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30LH4U3 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 1 more.
Key specifications for BACB30LH4U3: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 0.562 INCHES MINIMUM AND 0.592 INCHES MAXIMUM IN; Thread Length: 0.364 INCHES MINIMUM AND 0.414 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.