RK Pipe & Supply sells new and used square and hexagonal kellys from multiple manufacturers. Please see our online inventory and contact our sales department for information and quotes.
Square and Hexagonal Kelly Configuratoins
Kellys are manufactured with one of two drive configurations, square or hexagonal. Dimensions are listed in Table 1 and 2. Square kellys are furnished as forged or machined in the drive section. Hexagonal or fully machined square kellys are machined from full length quenched and tempered round bars.
Values in Tables 2 and 3 are from formulas listed in par. A.7, A.11 and A.12, Appendix A of API RP7G.