The Washer,flat, cataloged under National Stock Number 5310-01-173-2223, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Anillo Industries Llc. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-173-2223 |
| Primary Part Number | HS306-323H |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Anillo Industries Llc |
| Status | ACTIVE |
| Overall Diameter | 0.545 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Heat Treatment | T-3 SOLUTION HEAT TREATED, COLD WORKED |
| Material Document and Classification | QQ-A-250/4,T3 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.195 INCHES MINIMUM AND 0.206 INCHES MAXIMUM IN |
| Thickness | 0.062 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 |
|---|---|
| HS306-323H PRIMARY | Anillo Industries Llc (USA) |
| HS306-323H PRIMARY | Pac Zonamatic Inc (USA) |
| HS306-323H PRIMARY | Moeller Manufacturing & Supply, Llc (USA) |
| Reference | Meaning |
|---|---|
| HS306-323H | 7/2 Vendor item drawing reference The Boeing Company |
| HS306-323H | 5/9 Secondary reference Mcdonnell Douglas Helicopter Co Inc |
| HS306-323H | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-173-2223 is a Washer,flat, manufactured by Anillo Industries Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-173-2223 has 3 manufacturer part numbers on file: HS306-323H (Anillo Industries Llc), HS306-323H (Pac Zonamatic Inc), HS306-323H (Moeller Manufacturing & Supply, Llc).
Key specifications for HS306-323H: Overall Diameter: 0.545 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN; Heat Treatment: T-3 SOLUTION HEAT TREATED, COLD WORKED; Material Document and Classification: QQ-A-250/4,T3 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 9 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.