Kelly Bar Adapters

Selecting the correct Kelly Bar Adapter is key to building a proper Drive String.

 

Follow these two easy steps:

  1. Remove the auger from the driver and carefully measure the X and Y dimensions of the Kelly Bar. (See Kelly Bar Sizing Diagram to right)
  2. Match the shape of the Kelly Bar and the X and Y dimensions with the Kelly Bar Adapter charts below. The Y dimension on the Kelly Bar Adapter must be equal to or greater than the Y dimension on the intended Kelly Bar.

A Note about Bolt Circles

CHANCE anchor installing tools are provided with appropriate bolt circles for the expected service. The torque limitations for the two standard bolt circles are given below. Never exceed the rated torque of any Chance installing tool.

Bolt Circle Maximum Torque
(6) 1/2″ Grade 5 bolts on 5 1/4″ Bolt Circle 10,000 ft.-lb.
(12) 5/8″ Grade 2 bolts on 7 5/8″ Bolt Circle 20,000 ft.-lb.

5 1/4″-Bolt-Circle Kelly Bar Adapters for 10,000 ft.-lb. Maximum Installing Torque

Each of these Kelly Bar Adapters has six holes for 1/2″ bolts on a 5 1/4″ bolt circle and comes with six 1/2″ Grade 5 bolts, nuts & lockwashers, Bent-Arm Pin with Coil Lock.

Catalog
Number
Kelly Bar
Shape
Kelly Bar Dimension Weight,
lb.
X Y Z
630016 Square 2 1/4″ 2 1/4″ 3 1/2″ 10
630017 Square 2 1/2″ 2 1/4″ 3 1/2″ 10
630013 Hex 2″ 5″ 6 1/8″ 10
630013A Hex 2″ 3 1/4″ 6 1/8″ 10
630013 Hex 2″ 5″ 6 1/8″ 10
630012HD Hex 2 5/8″ 4 1/4″ 8 1/8″ 12
630011HD Hex 2 1/2″ 4 1/4″ 8 1/8″ 12

7 5/8″-Bolt-Circle Kelly Bar Adapters for 20,000 ft.-lb. Maximum Installing Torque

Each of these Kelly Bar Adapters has twelve holes for 5/8″ bolts on a 7 5/8″ bolt circle and comes with twelve 5/8″ Grade 2 bolts, nuts & lockwashers, Bent-Arm Pin with Coil Lock.

Catalog
Number
Kelly Bar
Shape
Kelly Bar Dimension Weight,
lb.
X Y Z
C303-0936 Hex 2 1/2″ 4 3/8″ 8 1/4″ 23
C303-0937 Hex 2 5/8″ 4 3/8″ 8 1/4″ 23
C303-0940 Hex 3″ 3 1/2″ 8″ 27
C303-0955 Square 2 1/2″ 2 1/4″ 7″ 22
C303-0958 Square 3″ 3 1/2″ &
2 1/16″
7″ 23

Kelly Bar Sizing Diagram

Kelly Bar Adapter Sizing Diagram