The Shim, cataloged under National Stock Number 5365-01-338-4178, is classified within Federal Supply Class 5365 (Bushings, Rings, Shims, and Spacers) of the Hardware and Abrasives group. The manufacturer of record is Boeing Defence Australia Ltd Div Defense, Space & Security. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5365-01-338-4178 |
| Primary Part Number | BACS40U4N3 |
| Item Name | Shim |
| FSC / FSG | 5365 / 53 — Bushings, Rings, Shims, and Spacers |
| Manufacturer | Boeing Defence Australia Ltd Div Defense, Space & Security |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE |
| Overall Thickness | 0.062 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN |
| Style Designator | CIRCULAR |
| Material Document and Classification | QQ-A-250/1 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/5 FED SPEC SINGLE MATERIAL RESPONSE |
| Outside Diameter | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Aperture Diameter | 0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN |
| Features Provided | SEPARABLE |
| Lamination Quantity | 11 |
| Specification/standard Data | 81205-BACS40U MANUFACTURERS STANDARD |
| Surface Treatment | CHROMATE |
| Lamination Thickness | 0.003 INCHES NOMINAL AND 0.032 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 1100 |
| Construction | LAMINATED |
| 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 |
|---|---|
| BACS40U4N3 | Boeing Defence Australia Ltd Div Defense, Space & Security (AUS) |
| BACS40U4N3 | Boeing Defence Australia Ltd (AUS) |
| Reference | Meaning |
|---|---|
| BACS40U4N3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5365-01-338-4178 is a Shim, manufactured by Boeing Defence Australia Ltd Div Defense, Space & Security, classified under FSC 5365, Bushings, Rings, Shims, and Spacers. Status: active.
NSN 5365-01-338-4178 has 2 manufacturer part numbers on file: BACS40U4N3 (Boeing Defence Australia Ltd Div Defense, Space & Security), BACS40U4N3 (Boeing Defence Australia Ltd).
1 possible match (shared part number, not a government interchangeability claim): 5365-01-669-4476. Verify interchangeability with system specifications before substitution.
Key specifications for BACS40U4N3: Surface Treatment Document and Classification: MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE; Overall Thickness: 0.062 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN; Style Designator: CIRCULAR; Material Document and Classification: QQ-A-250/1 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-250/5 FED SPEC SINGLE MATERIAL RESPONSE. 13 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.