... 4'', 7/8'',1'', 1 1/8'' 2 Grade:D,HY,HL,S-87, 3 Material: 20CrMoA/Carbon Steel 4.Length:7 ... latest version 11B are available in grade K, C, D and HL.diametermm(in)15.88(5/8)19.05 ... it is not susceptible to the sulfide stress cracking. Grade D sucker rod: It is made of quality alloy steel and ... Grade H sucker rod are same as those of Grade D sucker rod, but the strength reaches 966-1,136Mpa(140 ...