Kelly (Square & Hexagonal)

Rotary kellys come in two basic configurations, square and hexagonal. Each kelly meets the mechanical requirements of API Spec 7 and is available in four standard lengths:

• 37 ft (11.3 m) overall length, 34 ft (10.4 m) working space
• 40 ft (12.2 m) overall length, 37 ft (11.3 m) working space
• 46 ft (14.0 m) overall length, 43 ft (13.1 m) working space
• 54 ft (16.5 m) overall length, 51 ft (15.5 m) working space

Kellys are made from AISI 4145H modified alloy bars, quenched and tempered full length, with a hardness of 285–341 BHN and a minimum impact value of 40 ft-lbs one inch below the surface at room temperature. All ends and drive sections are machined, bores are precision-trepanned and drifted to API specification, and all connections are precision-machined and inspected.

When ordering, please specify

• Hexagonal or square kelly, nominal size and bore
• Size and type of top and bottom connections
• Top and bottom upset OD
• Shipping scabbards, if required