The Screw,close Tolerance, cataloged under National Stock Number 5305-01-063-2356, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 18 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-063-2356 |
| Primary Part Number | BACB30LK3U3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN |
| Fastener Length | 0.518 INCHES MINIMUM AND 0.548 INCHES MAXIMUM IN |
| Thread Length | 0.320 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | PAN |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 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 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.357 INCHES MINIMUM AND 0.373 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 |
|---|---|
| BACB30LK3U3 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LK3U3 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BACB30LK3U3 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LK3U3 PRIMARY | Huck International, Inc (USA) |
| BACB30LK3U3 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LK3U3 | Federal Manufacturing Corp (USA) |
| BACB30LK3U3 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LK3U3 PRIMARY | Honesdale Auto Supply, Inc. Dba Napa Auto Parts (USA) |
| Reference | Meaning |
|---|---|
| BACB30LK3U3 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30LK3U3 | 7/2 Vendor item drawing reference U.S. Government activity |
| BACB30LK3U3 | 5/9 Secondary reference U.S. Government activity |
| BACB30LK3U3 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-063-2356 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-063-2356 has 8 manufacturer part numbers on file: BACB30LK3U3 (Sps Technologies, Llc Dba PB Fasteners), BACB30LK3U3 (Howmet Global Fastening Systems Inc), BACB30LK3U3 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30LK3U3 (Huck International, Inc), BACB30LK3U3 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 3 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-3868. Verify interchangeability with system specifications before substitution.
Key specifications for BACB30LK3U3: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.122 INCHES MINIMUM AND 0.133 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.