The Screw,machine, cataloged under National Stock Number 5305-01-338-1308, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 14 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-338-1308 |
| Primary Part Number | BACS12GU3K10 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Screw Surface Treatment | ALUMINUM |
| Fastener Length | 0.609 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN |
| Screw Material Document and Classification | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE AND AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Length | 0.531 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.305 INCHES MINIMUM AND 0.314 INCHES MAXIMUM IN |
| Screw Material | TITANIUM ALLOY UNS R56400 |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| BACS12GU3K10 | Howmet Global Fastening Systems Inc (USA) |
| BACS12GU3K10 | Boeing Defence Australia Ltd (AUS) |
| BACS12GU3K10 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACS12GU3K10 | Boeing Defence Australia Ltd Div Defense, Space & Security (AUS) |
| BACS12GU3K10 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACS12GU3K10 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACS12GU3K10 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BACS12GU3K10 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BACS12GU3K10 | 3/2 Design control — primary reference U.S. Government activity |
| BACS12GU3K10 | 5/9 Secondary reference U.S. Government activity |
| BACS12GU3K10 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-338-1308 is a Screw,machine, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-338-1308 has 7 manufacturer part numbers on file: BACS12GU3K10 (Howmet Global Fastening Systems Inc), BACS12GU3K10 (Boeing Defence Australia Ltd), BACS12GU3K10 (Sps Technologies, Llc Dba PB Fasteners), BACS12GU3K10 (Boeing Defence Australia Ltd Div Defense, Space & Security), BACS12GU3K10 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-6960. Verify interchangeability with system specifications before substitution.
Key specifications for BACS12GU3K10: Head Height: 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN; Screw Surface Treatment: ALUMINUM; Fastener Length: 0.609 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN; Screw Material Document and Classification: AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE AND AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE. 14 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.