Threaded Steel Balls (Blind Hole) Threaded Steel Balls (Blind Hole). The ball is a threaded hole drilled in a solid stainless steel ball. 304 Stainless Steel Balls. Ball O.D.: 6 mm to 60 mm. Material A2 stainless steel (304 stainless steel) (06Cr19Ni10) (ASTM304).
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