The Screw,close Tolerance, cataloged under National Stock Number 5305-01-581-5555, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-581-5555 |
| Primary Part Number | BACB30YP6K3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| 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 | 0.437 INCHES MINIMUM AND 0.472 INCHES MAXIMUM IN |
| Fastener Length | 0.472 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | BMS 10-85 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.285 INCHES MINIMUM AND 0.295 INCHES MAXIMUM IN |
| Material Document and Classification | AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.183 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| Internal Drive Style | W/O INTERNAL DRIVE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNJC |
| Head Diameter | 0.2815 INCHES MINIMUM AND 0.2865 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 |
|---|---|
| BACB30YP6K3 | Huck International, Inc (USA) |
| BACB30YP6K3 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30YP6K3 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30YP6K3 | Hi-Shear Corporation (USA) |
| BACB30YP6K3 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| BACB30YP6K3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-581-5555 is a Screw,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-581-5555 has 5 manufacturer part numbers on file: BACB30YP6K3 (Huck International, Inc), BACB30YP6K3 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30YP6K3 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30YP6K3 (Hi-Shear Corporation), BACB30YP6K3 (Howmet Global Fastening Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-4149. Verify interchangeability with system specifications before substitution.
Key specifications for BACB30YP6K3: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.437 INCHES MINIMUM AND 0.472 INCHES MAXIMUM IN. 21 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.