The Screw,close Tolerance, cataloged under National Stock Number 5305-01-049-4055, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Federal Manufacturing Corp. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-049-4055 |
| Primary Part Number | BACB30LH3U24 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Federal Manufacturing Corp |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 1.830 INCHES MINIMUM AND 1.860 INCHES MAXIMUM IN |
| Thread Length | 0.320 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 81205-BACS12LH PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 1.490 INCHES MINIMUM AND 1.510 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 |
|---|---|
| BACB30LH3U24 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30LH3U24 PRIMARY | Federal Manufacturing Corp (USA) |
| BACB30LH3U24 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LH3U24 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LH3U24 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BACB30LH3U24 | 5/9 Secondary reference Huck International, Inc |
| BACB30LH3U24 | 5/9 Secondary reference U.S. Government activity |
| BACB30LH3U24 | 7/2 Vendor item drawing reference U.S. Government activity |
| BACB30LH3U24 | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| BACB30LH3U24 | 5/9 Secondary reference Voi-Shan/chatsworth Div of Vsi Corp Sub of Fairchild Industries Inc |
NSN 5305-01-049-4055 is a Screw,close Tolerance, manufactured by Federal Manufacturing Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-049-4055 has 5 manufacturer part numbers on file: BACB30LH3U24 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30LH3U24 (Federal Manufacturing Corp), BACB30LH3U24 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), BACB30LH3U24 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LH3U24 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for BACB30LH3U24: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 1.830 INCHES MINIMUM AND 1.860 INCHES MAXIMUM IN; Thread Length: 0.320 INCHES MINIMUM AND 0.350 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.