"OD 2.1298 IN. MIN,2.1308 IN. MAX ID 2.0310 IN. MIN,2.0610 IN. MX,BORE 1.8020 IN. MIN,1.8220 IN. MAX;MADE FROM STEEL,AISI 4130 OR 4140,HEAT TREAT PN09 .4140-HD-3,35-40 ROCKWELL C;FULL STRAIGHT KNURL 35 T.P.I. 0.003-0.007B PER SIDE;KNURL TO BREAK FULL INTO GROOVE;STRESS RELIEVE 1 HOUR 935 DEG F PLUS OR MINUS 25 DEG F;0.4945 IN. NOM WIDE"