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

-Top of Page-