NXF UNS S304/ 1.4301/SUS304/Z7CN18-09 2.25 Grade4-12.9 Diameter M1-100 Thickness 1-30 Stainless Steel Flat Washer

1.Raw Material Selection, Straightening and CuttingSelect 304 or 316 stainless steel coils matching the required gasket thickness. The coils are flattened by a leveling machine to eliminate internal coiling stress. Blank sheets are cut to size by a CNC shearing machine with proper machining allowance reserved according to gasket dimensions. Edge burrs and warpage are removed to guarantee substrate flatness.

2.Stamping and Blanking FormingFlat sheets are fed into precision stamping dies. A punch press carries out blanking of outer circles and inner holes in one go to mass-produce gasket blanks. Low-tonnage precision punches are adopted for ultra-thin gaskets to control stamping clearance and prevent workpiece stretching, deformation and hole edge chipping. Custom compound dies are equipped for special-shaped gaskets to form outlines and locating holes simultaneously.

3.Deburring and FlatteningStamped blanks carry burrs on punched and cut edges, which are eliminated via vibratory grinding, magnetic polishing or sandblasting. Workpieces then go through roller leveling to remove stamping-induced arching and warpage, with strict control over parallelism and flatness to meet flatness requirements for sealing assembly.

4.Surface Cleaning and PassivationDegreasing cleaning removes stamping drawing oil and grinding dust. After rinsing with pure water, stainless steel passivation is conducted to form a dense passive film on surfaces and boost rust and corrosion resistance during storage and transportation. Finished parts are dried to avoid surface oxidation and discoloration caused by humid air.

5.Full Dimensional Inspection, Sorting and PackagingCalipers, thickness gauges and flatness testers are used for full sampling inspection of inner diameter, outer diameter and thickness tolerances. Defective products with out-of-tolerance sizes, deformation or scratches are screened out. Qualified gaskets are vacuum-packed by specification with product labels to prevent scratches from friction during delivery before warehousing.