The Screw,close Tolerance, cataloged under National Stock Number 5305-01-238-4563, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 20 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-238-4563 |
| Primary Part Number | BACB30NT3K5 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| 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 | 0.642 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | BMS 10-85 TYPE 1 CAGEC 81205 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.320 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN |
| Material Document and Classification | AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | PAN |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| BACB30NT3K5 | Hi-Shear Corporation (USA) |
| BACB30NT3K5 | Howmet Global Fastening Systems Inc (USA) |
| BACB30NT3K5 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30NT3K5 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30NT3K5 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30NT3K5 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BACB30NT3K5 | Huck International, Inc (USA) |
| BACB30NT3K5 | Boeing Defence Australia Ltd (AUS) |
| Reference | Meaning |
|---|---|
| BACB30NT3K5 | 5/9 Secondary reference Boeing Defence Australia Ltd Div Defense, Space & Security |
| BACB30NT3K5 | 5/9 Secondary reference U.S. Government activity |
| BACB30NT3K5 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| BACB30NT3K5 | 5/2 Secondary reference U.S. Government activity |
| BACB30NT3K5 | 5/9 Secondary reference U.S. Government activity |
| BACB30NT3K5 | 5/9 Secondary reference Sps Technologies Inc |
| BACB30NT3K5 | 5/9 Secondary reference U.S. Government activity |
| BACB30NT3K5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-238-4563 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-238-4563 has 8 manufacturer part numbers on file: BACB30NT3K5 (Hi-Shear Corporation), BACB30NT3K5 (Howmet Global Fastening Systems Inc), BACB30NT3K5 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), BACB30NT3K5 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30NT3K5 (Howmet Global Fastening Systems Inc Div City of Industry Operations) and 3 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-6722. Verify interchangeability with system specifications before substitution.
Key specifications for BACB30NT3K5: 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. 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.