The Washer,flat, cataloged under National Stock Number 5310-01-507-2223, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Daimler Truck North America Llc. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-507-2223 |
| Primary Part Number | 221822 008000 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Daimler Truck North America Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | 49-00005-403 MFR REF ALL TREATMENT RESPONSES OR 49-00005-203 MFR REF ALL TREATMENT RESPONSES OVERALL |
| Overall Diameter | 18.4 MILLIMETERS MINIMUM AND 18.8 MILLIMETERS MAXIMUM MM |
| Supplementary Features | CAGE CALLS THIS: WASHER-FLAT,METRIC,HARDENED |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CHROMATE ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 8.9 MILLIMETERS MINIMUM AND 9.1 MILLIMETERS MAXIMUM MM |
| Thickness | 1.6 MILLIMETERS MINIMUM AND 2.3 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| 221822 008000 PRIMARY | Daimler Truck North America Llc (USA) |
| Reference | Meaning |
|---|---|
| B18.22M | 5/1 Secondary reference U.S. Government activity |
NSN 5310-01-507-2223 is a Washer,flat, manufactured by Daimler Truck North America Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-507-2223 has 1 manufacturer part number on file: 221822 008000 (Daimler Truck North America Llc).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-569-9619, 5310-01-617-1587. Verify interchangeability with system specifications before substitution.
Key specifications for 221822 008000: Surface Treatment Document and Classification: 49-00005-403 MFR REF ALL TREATMENT RESPONSES OR 49-00005-203 MFR REF ALL TREATMENT RESPONSES OVERALL; Overall Diameter: 18.4 MILLIMETERS MINIMUM AND 18.8 MILLIMETERS MAXIMUM MM; Supplementary Features: CAGE CALLS THIS: WASHER-FLAT,METRIC,HARDENED; Hardness Rating: 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM. 11 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.