Kelly Size
Length (mm)
Upper Box Connection
Lower Pin Connection
I.D.(mm)
Driving Section
mm
in
Type(LH)
O.D. (mm)
Cross Flat (mm)
For Square (mm)
Cross Corner for Hex (mm)
Std
Optional
Optio nal
Thread
O.D.(mm)
63.5
2-1/2
12.19
6-5/8REG
4-1/2REG
196.8
146
85.7
31.8
83.3
76.2
3
NC26
104.8
44.4
100
88.9
3-1/2
NC31
120.6
57.2
115.1
100.8
108
4-1/4
12.9
NC38
158.8
71.4
141.3
122.2
161.9
133.4
5-1/4
NC46
177.8
82.6
133.3
175.4
151.6
NC50
152.4
6
5-1/2FH
173
NC56
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