Junk SubDuring drilling process, drilling fishing cup is applied mainly for fishing of shivers and fallen objects such as carbide tooth, drill bit and bearing which can not be carried out of hole by conventional fluid circulation, etc. It possesses important functions to keep hole toe cleaning, increase bit service life, reduce and prevent drill bit from unexpected damage.StructureDue to the fact that the O.D. of external bowl of fishing cup is bigger and a smaller circular space is available between external bowl of fishing cup and well hole, the mandrel diameter at cup mouth is larger so that it has a bigger annular space, therefore, the fluid at the cup mouth form a swirls and suddenly fall down so as to reduce the carrying capacity. By this way, some heavy objects will drop in cup and be fished out so that the purpose of cleaning of hole toe is carried out.Technical Parameters -- Junk Sub     Model        Hole Size (mm)          Thread Conn.      I.D. (mm)  O.D. (mm)    LB94        108~117.5        2 3/8 REG                19             94    LB102        117.5~124        2 7/8 REG                32            102    LB114        130~149        3 1/2 REG                38            114    LB127        152.4~162        3 1/2 REG                38            127    LB140        165~190.5        3 1/2 REG                38            140    LB168        190.5~216        4 1/2 REG                57            168    LB178        219~244.5        4 1/2 REG                57            178    LB190        229~273        4 1/2 REG                57            190    LB197        235~297.5        4 1/2 IF                70            197    LB219        244~295        6 5/8 REG                76            219    LB229        254~305        6 5/8 REG                76            229    LB245        292~330        6 5/8 REG                76            245    LB280        330~375        7 5/8 REG                76            280    LB311        327~375        7 5/8 REG                76            311    LB327        375~444.5        7 5/8 REG                76            327    LB340        386~456        7 5/8 REG                76            340If you have any further requirements, please feel free to contact us by sales@sxgtpm.com