Kelly - Round 3 fluted Kelly with the floating drive is the most out standing driving mechanism in the rotary drilling field. Three evenly spaced flutes running lengthwise on the Kelly are mounted by heat treated pins in the Kelly drive bushing. These inexpensive, easily replaced pins are the principal wearing parts of the assembly. The flange type drive bushing provides a smooth running anti-backlash Kelly operation with a minimum of vertical friction. The equally loaded pins actually float, so that wear is evenly distributed for longer life, efficient, economical operation.
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Kelly

 

Round 3 fluted Kelly with the floating drive is the most out standing driving mechanism in the rotary drilling field. Three evenly spaced flutes running lengthwise on the Kelly are mounted by heat treated pins in the Kelly drive bushing. These inexpensive, easily replaced pins are the principal wearing parts of the assembly. The flange type drive bushing provides a smooth running anti-backlash Kelly operation with a minimum of vertical friction. The equally loaded pins actually float, so that wear is evenly distributed for longer life, efficient, economical operation.

Kelly


Size Upper Connection
Pin or Box
LH Thread
Lower Connection
Pin or Box
RH Thread
Standard
Length
Weight
Approximate
KGS.
OD ID
2 3/8"
1 1/8"
2” NPT
2” NPT
13' 6''
50
2 7/8” 1 1/2” 2 3/8” API REG. 2 3/8” API REG. 18’ 0”
117
28’ 0” 181
3 3/8” 1 3/4” 2 3/8” API IF 2 3/8” API IF 23’ 0” 191
28’ 0”
227
34’ 0” 276
4 1/8” 2 1/8” 2 7/8” API IF 2 7/8” API IF 23’ 0” 276
28’ 0” 279
34’ 0” 339
4 5/8” 2 1/4” 3 1/2” API FH 3 1/2” API FH 23’ 0” 390
28’ 0” 480
34’ 0” 580

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