Kelly

Description

Kelly is made from AISI 4145H modified alloy bars which are
quenched and tempered full length. A hardness range of 285 to 341 BHN
and a minimum impact value of 54 joules, these values are guaranteed one
inch below the surface. Kelly bars are inspected by an ultrasonic unit
over their full length and full section. The wall thickness of each flat
of the drive section is verified ultrasonically on each Kelly. Kelly is
available with square Kelly and hexagonal Kelly of 40ft.

Specification Data of Kelly.

Parameter

Nom. Size inch	Top upset		Bottom upset		Bore	Driving section
Nom. Size inch	connection type	OD	connection type	OD	inch	cross flat	For sq. kelly	Cross corner for hex. kelly
2-1/2	6-5/8 Reg.	7-3/4	NC26	3-3/8	1-1/4	2-1/2	3-1/4
3			NC31	4-1/4	1-3/4	3	4	3-3/8
3-1/2			NC38	4-3/4	2-1/4	3-1/2	5	4
4-1/4			NC46	6-1/4	4-1/4	4-1/4	5-1/5	4-7/8
4-1/4			NC50	6-3/8	4-1/4	4-1/4	5-1/5	4-7/8
5-1/4			5-1/2FH	7	5-1/4	3-1/4	7	6

When ordering or requesting quotation on kelly, please specify: ● Hexagonal or square Kelly ● Nominal size ● Size and type of Top connection ● Size and type of Bottom connection ● Plain shipping scabbards are available