Kelly bar is the key part of a drilling machine, and its quality directly affects the performance of the whole machine. The main purpose of kelly bar is to transfer the torque of rotary drive and crowd pressure of the crowd system to the drilling tool. Based on the rich manufacturing experience and by absorbing the advanced technology both at home and abroad, we can produce first-class kelly bar which can be compared favorably with the imported ones.
Friction Kelly Bar
Friction Kelly bars are used with piling rigs for drilling in silt, clay and less dense sand and gravel. The Friction Kelly bars manufactured by Unimate are un-lockable with drive keys on each section. Kelly bars can be equipped with specially designed springs or pressure plates for shock absorbing purpose. Please see below chart of some of our standard productions for Friction kelly bars:
Identification No. Torque(ton.m) O.D.(mm) Sections Drilling Depth (m)
FK 36/470/3/27~28 36 470 3 27~28
FK 36/470/4/36~72 36 470 4 36~72
FK 25/440/3/36 25 440 3 36
FK 25/440/4/50 25 440 4 50
FK 25/440/5/65 25 440 5 65
FK 28/394/3/24~48 28 394 3 24~48
FK 28/394/4/32~65 28 394 4 32~65
FK 18/377/3/36 18 377 3 36
FK 18/377/4/50 18 377 4 50
FK 22/406/3/36 22 406 3 36
FK 22/406/4/50 22 406 4 50
FK 36/508/4/60 36 508 4 60
FK 36/508/5/75 36 508 5 75
*Other sizes can be manufactured as per customer demand