PARVEEN square kellys & Hex kellys are made from AISI 4145 H modified alloy steel bar, quenched & tempered along its entire length to deliver depend-ability & long service life. This gives hardness range of 285-341 BHN & a minimum IZOD impact value of 40 ft-lb, at one inch below the surface at room temperature. Their heavy walls allow little flexibility; joint alignment is held to close tolerances to help eliminate "working" at the joints & minimize joint failure. Length of the top & bottom upsets permits recutting the threads several times for longer life.

Parveen kelly bars are inspected ultrasonically, over their full length. All kellys are precision-bored by trepanning to provide true bores & are drifted to API specifications. Kelly ends & drive sections, internal diameters & connections are machined & controlled to API specifications.

Order Requirements
When ordering or requesting quotations on kellys, please specify:

- Hexagonal or square kelly.
- Nominal size.
- Length - (L)
- Bore - (d)
- Size & type of top connecti-on.
- Size & trpe of bottom conn-ection.
- Top upset OD-(Du)
- Bottom upset OD-(DLr)

Other sizes not shown may be furnished upon request.