The Screw,close Tolerance, cataloged under National Stock Number 5305-01-164-6345, 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 19 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-164-6345 |
| Primary Part Number | BACB30LL4K10 |
| 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 BEARING SURFACE OF HEAD |
| Fastener Length | 0.999 INCHES MINIMUM AND 1.029 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | BMS 10-85,TY 1,FSCM 81205 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.364 INCHES MINIMUM AND 0.414 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.354 INCHES MINIMUM AND 0.399 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 |
|---|---|
| BACB30LL4K10 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BACB30LL4K10 PRIMARY | Huck International, Inc (USA) |
| BACB30LL4K10 | Howmet Global Fastening Systems Inc (USA) |
| BACB30LL4K10 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LL4K10 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| BACB30LL4K10 | 5/9 Secondary reference U.S. Government activity |
| BACB30LL4K10 | 5/2 Secondary reference U.S. Government activity |
| BACB30LL4K10 | 5/9 Secondary reference U.S. Government activity |
| BACB30LL4K10 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5305-01-164-6345 is a Screw,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-164-6345 has 5 manufacturer part numbers on file: BACB30LL4K10 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BACB30LL4K10 (Huck International, Inc), BACB30LL4K10 (Howmet Global Fastening Systems Inc), BACB30LL4K10 (Sps Technologies, Llc Dba PB Fasteners), BACB30LL4K10 (Hi-Shear Corporation).
Key specifications for BACB30LL4K10: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 0.999 INCHES MINIMUM AND 1.029 INCHES MAXIMUM IN; Surface Treatment Document and Classification: BMS 10-85,TY 1,FSCM 81205 MFR REF SINGLE TREATMENT RESPONSE OVERALL. 19 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.