Square Kelly and Hexagonal Kelly

Main Technical Features

● Both square Kelly and hexagonal Kelly is available as per customers’ requirements.

● Designed & Manufactured according to API SPEC 7-1.

● Square& Hexagonal kelly are made from AISI 4145H modified alloy bars that are quenched

and tempered full length. After such heat treatment, its brinell hardness can reach 285-341.

Kelly’s’end, drive cross-section and joint are all processed and tested conform to API criterion

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