GRADE SHEET


GRADE ALLOWABLE BALL DIAMETER VARIATION ALLOWABLE DEVIATION FROM SPHERICAL FORM MAXIMUM SURFACE ROUGHNESS*AA BASIC DIAMETER TOLERANCE (+/-)
25 .000025 .000025 2.0 .0001
50 .000050 .000050 3.0 .0002
100 .000100 .000100 5.0 .0005
200 .000200 .000200 8.0 .0010
500 .000500 .000500 N/A .0020
1000 .001000 .001000 N/A .0050

VALVE GRADE SURFACE FINISH


SIZE RANGE MAXIMUM SURFACE ROUGHNESS*AA
5/8" TO 1" 1.5
1 1/16" TO 1 3/8" 2.0
1 7/16" TO 5" 3.0

* ARITHMETICAL AVERAGE