steel,astm a322,alloy 4620 or alloy 4820 or alloy 8620 condition optional,outer member,steel,inner members,rockwell c scale 58.0 min,62.0 max hardness outer member,3.000 in. od,2.000 in. min,2.003 in. max width,1.4990 in. min,1.4997 in. max bore in which is inserted a 2 piece steel roller general characteristics item description