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PMC can produce customized square or hexagonal Kellys with normal range of 12.19 meter. the raw materials we utilized are PMC self-designed AISI 4145H alloy steel. Kelly ends and drive sections, I.D.s and connections are machined according to SY/T 6509-2000 standards.

Square Kelly

Square Kelly Specification
Norminal Size	Length (ft)	Top Upset Joint		Bottom Upset Joint		Bore ID	Drive Section		Est. Weight k.g.
Norminal Size	Length (ft)	APIBOX Thread Left Hand	Du	Right Hand Connections	DL	Bore ID	Across Corners	Across Flats	Est. Weight k.g.
3-1/2	40	6 5/8REG	7 3/4	NC38(3 1/2IF)	4 3/4	2 1/4	4.437	3 1/2	596
4-1/4	40	6 5/8REG	7 3/4	NC46(41F) NC50(4 1/2IF)	6～6 3/8 6 1/8～6 3/8	2 13/16	5.500	4 1/4	820
5-1/4	40	6 5/8REG	7 3/4	NC50 5 1/2FH	7	3 1/4	6.750	5 1/4	1250
6	40	6 5/8REG	7 3/4	6 5/8REG	7 3/4	3 1/2	7.625	6	1665

Hexagonal Kellys

Hexagonal Kelly Specification
Norminal Size	Length (ft)	Top Upset Joint		Bottom Upset Joint		Bore ID	Drive Section		Est. Weight k.g.
Norminal Size	Length (ft)	APIBOX Thread Left Hand	Du	Right Hand Connections	DL	Bore ID	Across Corners	Across Flats	Est. Weight k.g.
3-1/2	40	6 5/8REG	7 3/4	NC31(2 7/8IF)	4 1/8	1 3/4	3.937	3 1/2	580
4-1/4	40	6 5/8REG	7 3/4	NC38(3 1/2IF)	4 3/4	2 1/4	4.781	4 1/4	780
5-1/4	40	6 5/8REG	7 3/4	NC46(4 IF) NC50(4 1/2 IF)	6～6 3/8 6 1/8～6 3/8	3 3 1/4	5.900	5 1/4	1147