In procurement drawings, quality reports, or surface treatment requirements for precision-cast and CNC-machined parts, terms such as Ra, Ry, Rz, and polishing levels are frequently seen. While all related to surface finish, they are not the same concept. Choosing the wrong indicator may result in parts that, although "appear shiny," fail in sealing, fit, wear resistance, or coating adhesion. This article, starting from the practical applications of stainless steel precision casting and CNC machining, compares surface roughness indicators, common polishing conditions, metal wear risks, and subsequent surface treatment selection strategies. I. Surface Finish…

Stainless steel deep well pump parts, cast and CNC machined complete sets, suitable for the production of supporting parts for deep well pumps, submersible pumps, fluid conveying equipment, and various pump and valve systems. Haijin Stainless Steel can provide stainless steel precision casting, heat treatment, CNC milling and turning, thread machining, drilling and tapping, surface treatment, and complete set delivery services according to customer drawings, samples, or assembly requirements, helping customers consistently obtain pump parts with consistent dimensions, smooth assembly, and good corrosion resistance. One-stop customized processing of stainless steel deep well pump parts. Deep well pumps are exposed to groundwater, silt, pressure shocks, and complex operating conditions for extended periods, requiring high material strength and corrosion resistance in the parts…