PEMSCO Ltd. Products - Safety Clamps

6. Kelly

General
Kelly is made from 4145H alloy steel which is quenched and tempered at full length. The hardness is 285-341 BHN and the minimum impact value is 54J as per ASTM A370 Charpy-V. Kelly ends and drive sections, internal diameters and connections are machined and inspected according to API Spec 7. Kelly bar is inspected by ultrasonic unit. The wall thickness of each flat of the drive section is verified ultrasonically.
Product type
• Square kelly
• Hexagon kelly
Basic Technical Parameters of Square Kelly

Norm.size(in)	Standardlengthm(ft)	Box end		Pin end		Borediametermm(in)	Drive sectionacross flatmm(in)
Norm.size(in)	Standardlengthm(ft)	LHconnection	ODmm(in)	RHconnection	ODmm(in)	Borediametermm(in)	Drive sectionacross flatmm(in)
2-1/2	12.19/14.02	6-5/8 REG	197	NC26	86	32	64
2-1/2	(40/46)	6-5/8 REG	(7-3/4)	NC26	(3-3/8)	(1-1/4)	(2-1/2)
3	12.19/14.02	6-5/8 REG	197	NC31	105	44	76
3	(40/46)	6-5/8 REG	(7-3/4)	NC31	(4-1/8)	(1-3/4)	-3
3-1/2	12.19/14.02	6-5/8 REG	197	NC38	121	57	89
3-1/2	(40/46)	6-5/8 REG	(7-3/4)	NC38	(4-3/4)	(2-1/4)	(3-1/2)
4-1/4	12.19/14.02/16.46	6-5/8 REG	197	NC46	159	71	108
	12.19/14.02/16.46	6-5/8 REG	197	NC46	6-1 /4	71	108
	(40/46/54)		(7-3/4)	NC50	162	(2-13/16)	(4-1/4)
	(40/46/54)		(7-3/4)	NC50	6-3/8	(2-13/16)	(4-1/4)
5-1/4	12.19/14.02/16.46	6-5/8 REG	197	5-1/2 FH	178	83	133
	12.19/14.02/16.46		197	5-1/2 FH	(7)	83	133
	(40/46/54)		(7-3/4)	NC56	178	(3-1/4)	(5-1/4)
	(40/46/54)		(7-3/4)	NC56	(7)	(3-1/4)	(5-1/4)

Notes: Any kind of combination of square kelly and left hand connection of other models and sizes is available.
Basic Technical Parameters of Hexagon Kelly

Norm.size(in)	Standardlengthm(ft)	Box end		Pin end		Borediametermm(in)	Drive sectionacross flatmm(in)
		LHconnection	ODmm(in)	RHconnection	ODmm(in)
3	12.19/14.02	6-5/8 REG	197	NC26	86	32	76
	(40/46)		(7-3/4)		(3-3/8)	(1-1/4)	(3)
3-1/2	12.19/14.02/16.46	6-5/8 REG	197	NC31	105	44	89
	(40/46/54)		(7-3/4)		(4-1/8)	(1-3/4)	(3-1/2)
4-1/4	12.19/14.02/16.46	6-5/8 REG	197	NC38	121	57	108
	(40/46/54)		(7-3/4)		(4-3/4)	(2-1/4)	(4-1/4)
5-1/4	12.19/14.02/16.46	6-5/8 REG	197	NC46	159	76	133
					6-1/4	(3)
	(40/46/54)		(7-3/4)	NC50	162	83	(5-1/4)
					6-3/8	(3-1/4)
6	12.19/14.02/16.46	6-5/8 REG	197	5-1/2 FH	178	89	152
					(7)	(3-1/2)
	(40/46/54)		(7-3/4)	NC56	178	89	(6)
					(7)	(3-1/2)

Notes: Any kind of combination of hexagon kelly and left hand connection of other models and sizes is available.
• When inquiring or ordering, please specify:
• Kelly type (square or hexagon)
• Nominal size and bore diameter
• Overall length
• Connection size and type
• Thread protector type

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