The Screw,close Tolerance, cataloged under National Stock Number 5305-01-044-4418, 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 17 specifications, cited from the U.S. Government catalog. The record lists 8 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-044-4418 |
| Primary Part Number | BACB30LH3U2 |
| 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 GRIP |
| Fastener Length | 0.455 INCHES MINIMUM AND 0.485 INCHES MAXIMUM IN |
| Thread Length | 0.320 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 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 | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.337 INCHES MINIMUM AND 0.383 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 |
|---|---|
| BACB30LH3U2 | Howmet Global Fastening Systems Inc (USA) |
| BACB30LH3U2 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LH3U2 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LH3U2 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30LH3U2 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LH3U2 | Federal Manufacturing Corp (USA) |
| BACB30LH3U2 | Huck International, Inc (USA) |
| BACB30LH3U2 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BACB30LH3U2 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30LH3U2 | 5/2 Secondary reference U.S. Government activity |
| BACB30LH3U2 | 5/9 Secondary reference Voi-Shan/chatsworth Div of Vsi Corp Sub of Fairchild Industries Inc |
| BACB30LH3U2 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-044-4418 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-044-4418 has 8 manufacturer part numbers on file: BACB30LH3U2 (Howmet Global Fastening Systems Inc), BACB30LH3U2 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), BACB30LH3U2 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LH3U2 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30LH3U2 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 3 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-3869. Verify interchangeability with system specifications before substitution.
Key specifications for BACB30LH3U2: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 0.455 INCHES MINIMUM AND 0.485 INCHES MAXIMUM IN; Thread Length: 0.320 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN. 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.