The Washer,flat, cataloged under National Stock Number 5310-01-218-3209, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Link-Belt Cranes, L.p., Lllp. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-218-3209 |
| Primary Part Number | 1S221 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Link-Belt Cranes, L.p., Lllp |
| Status | ACTIVE |
| Overall Diameter | 3.344 INCHES MINIMUM AND 3.375 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.031 INCHES MINIMUM AND 1.062 INCHES MAXIMUM IN |
| Thickness | 0.250 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 |
|---|---|
| 1S221 PRIMARY | Link-Belt Cranes, L.p., Lllp (USA) |
| Reference | Meaning |
|---|---|
| 1S221 | 5/9 Secondary reference Fmc Corp Construction Equipment Div |
NSN 5310-01-218-3209 is a Washer,flat, manufactured by Link-Belt Cranes, L.p., Lllp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-218-3209 has 1 manufacturer part number on file: 1S221 (Link-Belt Cranes, L.p., Lllp).
Key specifications for 1S221: Overall Diameter: 3.344 INCHES MINIMUM AND 3.375 INCHES MAXIMUM IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: STEEL 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.