The Washer,flat, cataloged under National Stock Number 5310-01-522-5300, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hhe Services, Inc.. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-522-5300 |
| Primary Part Number | 99C621-06-DWG-07-A-0 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hhe Services, Inc. |
| Status | ACTIVE |
| Overall Diameter | 7.000 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL CORROSION RESISTING OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 4.010 INCHES NOMINAL IN |
| Thickness | 0.130 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 |
|---|---|
| 99C621-06-DWG-07-A-0 PRIMARY | Hhe Services, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HI-721-6000 REV G ITEM 9 | 5/1 Secondary reference Hhe Services, Inc. |
NSN 5310-01-522-5300 is a Washer,flat, manufactured by Hhe Services, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-522-5300 has 1 manufacturer part number on file: 99C621-06-DWG-07-A-0 (Hhe Services, Inc.).
Key specifications for 99C621-06-DWG-07-A-0: Overall Diameter: 7.000 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: STEEL CORROSION RESISTING OVERALL. 7 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.