Kellys

    Kellys is driving section of wohole drill stem. Kelly is available with square kelly and hexagonal kelly. TIANHE brand kelly are manufactured strictly from API Spec7-1 and SY/T6509-2000 standard.

Technical specification and parameters

Size		Length in	Upper box connection				Lower pin connection		I.D.	Driving section
mm	in		Type(LH)		O.D.		Thread	O.D.		Cross flat	For square kelly	Cross corner for hexa kelly
			Std	optional	Std	optional
63.5	2 1/2	12.19	6 5/8REG	4 1/2REG	196.8	146.0	NC26	85.7	31.8	63.5	83.3
76.2	3	12.19	6 5/8REG	4 1/2REG	196.8	146.0	NC31	104.8	44.4	76.2	100.0	85.7
88.9	3 1/2	12.19	6 5/8REG	4 1/2REG	196.8	146.0	NC38	120.6	57.2	88.9	115.1	100.8
108.0	4 1/4	12.9	6 5/8REG	4 1/2REG	196.8	146.0	NC46	158.8	71.4	108.0	141.3	122.2
			6 5/8REG	4 1/2REG	196.8	146.0	NC50	161.9	71.4	108.0	141.3	122.2
133.4	5 1/4	12.9	6 5/8REG		196.8		5 1/2FH	177.8	82.6	133.3	175.4	151.6
			6 5/8REG		196.8		NC56	177.8	82.6	133.3	175.4	151.6