Kelly

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Kelly is located in the top of the drill string, with square and hexagonal. In rotary drilling, when it is drilling, kelly connected with square bushing and rotary bushing, transfer the ground rotary torque to drill pipe and to drive the drill bit,bearing the weight of the drill string.In the drilling of the turbine and screw, the weight of the drill string and the counter torque are supported.

chemical composition

Square Kelly Specification:

Specification		Drive part length		Overall length		Drive part						Upper internal threaded joint							Lower external threaded joint				Inner diameter
		Standard LD	Selection LD	Standard	Selection	Square size DFL	Across corner DC	Across corner DCC	Radius RC	Radius RCC	Eccentric hole minimum wall thickness	Screw thread specification and left rotate type		Outside diameter		Chamfering diameter			Thread specification and type	Outside diameter DLR	Length LL	Chamfering diameter DF
		Standard LD	Selection LD	Standard	Selection	Square size DFL	Across corner DC	Across corner DCC	Radius RC	Radius RCC	Eccentric hole minimum wall thickness	Standard	Selection	Standard	Selection DU	length LU	Standard DF	Selection DF	Thread specification and type	Outside diameter DLR	Length LL	Chamfering diameter DF
63.5	（2½）	11280		12190		63.5	83.3	82.55	7.9	41.3	11.43	（65/8）REG	(4½) REG	196.9	146.1	406.4	186.1	134.5	NC26 (23/8IF)	85.7	508	82.9	31.8
76.2	3	11280		12190		76.2	100	98.43	9.5	49.2	11.43	（65/8）REG	(4½) REG	196.9	146.1	406.4	186.1	134.5	NC31 (27/8IF)	104.8	508	100.4	44.5
88.9	（3½）	11280		12190		88.9	115.1	112.7	12.7	56.4	11.43	（65/8）REG	(4½) REG	196.9	146.1	406.4	186.1	134.5	NC38 (3½IF)	120.7	508	116.3	57.2
108	（4¼）	11280	15540	12190	16460	108	141.3	139.7	12.7	69.9	12.07	（65/8）REG	(4½) REG	196.9	146.1	406.4	186.1	134.5	NC46 (4IF)	158.8	508	145.3	71.4
108	（4¼）	11280	15540	12190	16460	108	141.3	139.7	12.7	69.9	12.07	（65/8）REG	(4½) REG	196.9	146.1	406.4	186.1	134.5	NC50 (4½IF)	161.9	508	154	71.4
133.4	（5¼）	11280	15540	12190	16460	133.4	175.4	171.45	15.9	85.7	15.88	（65/8）REG		196.9		406.4	186.1		5½FH	177.8	508	170.7	82.6
133.4	（5¼）	11280	15540	12190	16460	133.4	175.4	171.45	15.9	85.7	15.88	（65/8）REG		196.9		406.4	186.1		NC56	177.8	508	170.7	82.6

Hexagonal Kelly Specification mm（in):

Specification		Drive part lengthти длины		Overall length		Drive part						Upper internal threaded joint							Lower external threaded joint				Inner diameter
		Standard LD	Selection LD	Standard	Selection	Square size DFL	Across corner DC	Across corner DCC	Radius RC	Radius RCC	Eccentric hole minimum wall thickness	Screw thread specification and left rotate type		Outside diameter		Chamfering diameter			Thread specification and type	Outside diameter DLR	Length LL	Chamfering diameter DF
		Standard LD	Selection LD	Standard	Selection	Square size DFL	Across corner DC	Across corner DCC	Radius RC	Radius RCC	Eccentric hole minimum wall thickness	Standard	Selection	Standard DC	Selection DU	length LU	Standard DF	Selection DF	Thread specification and type	Outside diameter DLR	Length LL	Chamfering diameter DF
63.5	（2½）	11280		12190		76.2	85.7	85.73	6.4	42.9	12.1	（65/8）REG	(4½) REG	196.9	146.1	406.4	186.1	134.5	NC26 (23/8IF)	85.7	508	82.9	31.8
76.2	3	11280		12190		88.9	100.8	100	6.4	50	13.3	（65/8）REG	(4½) REG	196.9	146.1	406.4	186.1	134.5	NC31 (27/8IF)	104.8	508	100.4	44.5
88.9	（3½）	11280	15540	12190	16460	108	122.2	121.44	9.9	60.7	15.9	（65/8）REG	(4½) REG	196.9	146.1	406.4	186.1	134.5	NC38 (3½IF)	120.7	508	116.3	57.2
108	（4¼）	11280	15540	12190	16460	133.4	151.6	149.86	9.5	75	15.9	（65/8）REG	-	196.9	-	406.4	186.1	-	NC46 (4IF)	158.8	508	145.3	71.4
108	（4¼）	11280	15540	12190	16460	133.4	151.6	149.86	9.5	75	15.9	（65/8）REG	-	196.9	-	406.4	186.1	-	NC50 (4½IF)	161.9	508	154	71.4
133.4	（5¼）	11280	15540	12190	16460	152.4	173	173.02	9.5	86.5	15.9	（65/8）REG	-	196.9	-	406.4	186.1	-	5½FH	177.8	508	170.7	82.6
133.4	（5¼）	11280	15540	12190	16460	152.4	173	173.02	9.5	86.5	15.9	（65/8）REG	-	196.9	-	406.4	186.1	-	NC56	177.8	508	170.1	82.6

Steel Mark	Chemical Composition%
Steel Mark	C	Si	Mn	P	S	Cr	Mo	Cu	Al
4145H	0.42～0.48	0.15～0.35	0.90～1.20	≤0.03	≤0.03	0.90～1.20	0.15～0.25	≤0.2	0.025～0.045
Other Elements：N≤0.015，Ni≤0.5

Mechanical Property:

Mechanical Property
Outside Diameter Range		Yield Strength		Tensile Strength		Elongation A%	HB	Charpy impact Akv J
mm	in	MPa	Psi	MPa	Psi	Elongation A%	HB	Charpy impact Akv J
79.4～171.4	3-1/8～6-3/4	≥758	≥110000	≥965	≥140000	≥13	285～341	≥54
177.8	7	≥689	≥100000	≥930	≥135000	≥13	285～341	≥54
Under special conditions, the impact work of the charpy can be determined as greater than 70J according to the supply and demand

Kelly