The Washer,flat, cataloged under National Stock Number 5310-01-173-5828, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Pac Zonamatic Inc. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-173-5828 |
| Primary Part Number | HS306-327H |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Pac Zonamatic Inc |
| Status | ACTIVE |
| Overall Diameter | 0.790 INCHES MINIMUM AND 0.810 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 | 0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Thickness | 0.063 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 |
|---|---|
| HS306-327H PRIMARY | Pac Zonamatic Inc (USA) |
| HS306-327H PRIMARY | Moeller Manufacturing & Supply, Llc (USA) |
| HS306-327H PRIMARY | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| HS306-327H | 7/2 Vendor item drawing reference The Boeing Company |
| HS306-327H | 5/9 Secondary reference Mcdonnell Douglas Helicopter Co Inc |
| HS306-327H | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-173-5828 is a Washer,flat, manufactured by Pac Zonamatic Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-173-5828 has 3 manufacturer part numbers on file: HS306-327H (Pac Zonamatic Inc), HS306-327H (Moeller Manufacturing & Supply, Llc), HS306-327H (Anillo Industries Llc).
Key specifications for HS306-327H: Overall Diameter: 0.790 INCHES MINIMUM AND 0.810 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.