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 2) Standard: API Spec 11B

 3) Main specification:

   OD:1-1/2" (38.10mm)

   ID: 15/16"(23.81mm)

   Length: 4" (101.6mm)

   Weight: 0.56kg

 4)Other Size: 3/4”; 7/8”;1”; 1-1/8”

5)Smoothness: 3.1*10^-3

 6)Coat Thickness(in): 0.01in ~ 0.02in

 7)Basic hardness: HRC 16-23

 8)Surface Hardness: HRC 55-62

 10)Hole rate: <2%

 9)Bonding Strength(Mpa): 484

 11)Min. Hardness of the layer: 595HV_0.2

 12)Min. Tensile Strength: 655 Mpa

 13)Operating Temperature: -1000~400 Centigrade Temperature

 14)Life: > 180 days

 15) Package: wooden case, 1000pcs each case.

 16) Usage: oil exploration equipment, accessories, oil sucker rod coupling