270 Brass Ball Material Brass Material Grade 270 Outside Diameter 3/8 in Outside Diameter Tolerance +/-0.001 in Ball Weight 3.844 g Ball Bearing Grade 200 Rockwell Hardness B75 to B87 Standards ASM 4712 ASTM B134 UNS C-27000 Mechanical Finish Mill System of Measurement Inch Application Electrical Flow Control Furniture Shape Ball Package Quantity 250