The Screw,close Tolerance, cataloged under National Stock Number 5305-01-210-0794, 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 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-210-0794 |
| Primary Part Number | BACB30LH3U23 |
| 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 |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 1.768 INCHES MINIMUM AND 1.798 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.320 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.428 INCHES MINIMUM AND 1.448 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 | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| 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 |
|---|---|
| BACB30LH3U23 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BACB30LH3U23 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LH3U23 PRIMARY | Federal Manufacturing Corp (USA) |
| BACB30LH3U23 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LH3U23 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LH3U23 PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| BACB30LH3U23 | 5/9 Secondary reference U.S. Government activity |
| BACB30LH3U23 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30LH3U23 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30LH3U23 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-210-0794 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-210-0794 has 6 manufacturer part numbers on file: BACB30LH3U23 (Howmet Global Fastening Systems Inc), BACB30LH3U23 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30LH3U23 (Federal Manufacturing Corp), BACB30LH3U23 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LH3U23 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 1 more.
Key specifications for BACB30LH3U23: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 1.768 INCHES MINIMUM AND 1.798 INCHES MAXIMUM IN. 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.