The Screw,assembled Washer, cataloged under National Stock Number 5305-01-589-2341, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Boeing Defence Australia Ltd. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-589-2341 |
| Primary Part Number | BACS12FA3K4 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Boeing Defence Australia Ltd |
| Status | ACTIVE |
| Extended Washer Thickness | 0.025 INCHES NOMINAL IN |
| Head Height | 0.940 INCHES NOMINAL IN |
| Fastener Length | 0.250 INCHES NOMINAL IN |
| Extended Washer Diameter | 0.438 INCHES NOMINAL IN |
| Primary Washer Outside Diameter | 0.438 INCHES NOMINAL IN |
| Thread Length | 0.250 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | ROUND EXTENDED WASHER |
| Primary Washer Style | FLAT |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.025 INCHES NOMINAL IN |
| Surface Treatment | ALUMINUM OVERALL |
| Internal Drive Style | CROSS RECESS TYPE III |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Washer Quantity | 1 |
| Head Diameter | 0.375 INCHES NOMINAL 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 |
|---|---|
| BACS12FA3K4 | Boeing Defence Australia Ltd (AUS) |
| Reference | Meaning |
|---|---|
| BACS12FA3K4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-589-2341 is a Screw,assembled Washer, manufactured by Boeing Defence Australia Ltd, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-589-2341 has 1 manufacturer part number on file: BACS12FA3K4 (Boeing Defence Australia Ltd).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-6583. Verify interchangeability with system specifications before substitution.
Key specifications for BACS12FA3K4: Extended Washer Thickness: 0.025 INCHES NOMINAL IN; Head Height: 0.940 INCHES NOMINAL IN; Fastener Length: 0.250 INCHES NOMINAL IN; Extended Washer Diameter: 0.438 INCHES NOMINAL IN. 18 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.