The Screw,close Tolerance, cataloged under National Stock Number 5305-01-059-0229, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc Div City of Industry Operations. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-059-0229 |
| Primary Part Number | BACB30LR8-17 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc Div City of Industry Operations |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES GRIP |
| Fastener Length | 1.562 INCHES MINIMUM AND 1.594 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.490 INCHES MINIMUM AND 0.542 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 81205-BACB30AB MANUFACTURERS STANDARD |
| Grip Length | 1.052 INCHES MINIMUM AND 1.072 INCHES MAXIMUM IN |
| Grip Diameter | 0.4982 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.929 INCHES MINIMUM AND 1.024 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 |
|---|---|
| BACB30LR8-17 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30LR8-17 | Federal Manufacturing Corp (USA) |
| BACB30LR8-17 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LR8-17 | Blanc Aero Industrie Villefranche De Rouergue - Groupe Lisi Aerospace (FRA) |
| BACB30LR8-17 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LR8-17 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LR8-17 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BACB30AB-P8-21A | 5/9 Secondary reference U.S. Government activity |
| BACB30LR8-17 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-059-0229 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc Div City of Industry Operations, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-059-0229 has 7 manufacturer part numbers on file: BACB30LR8-17 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30LR8-17 (Federal Manufacturing Corp), BACB30LR8-17 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LR8-17 (Blanc Aero Industrie Villefranche De Rouergue - Groupe Lisi Aerospace), BACB30LR8-17 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 2 more.
Key specifications for BACB30LR8-17: Surface Finish: 63.0 MICROINCHES GRIP; Fastener Length: 1.562 INCHES MINIMUM AND 1.594 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.490 INCHES MINIMUM AND 0.542 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.