Specifications

1, Kelly drill pipe is made AISI 4145H alloy steel
2,It is formed by hot forged and fully heat- treated
3,professional techno

Kelly drill pipe

 

Product description:Kelly is the drive part of whole drill stem, it has two types, square kelly and hexagonal kelly and all of them are manufactured comfort to API Spec7-1 and SY/T6509-2000 criterion.

Our Square& Hexagonal kelly are made from AISI 4145H modified alloy bars that are quenched and tempered full length. After such heat treatment, its brinell hardness can reach 285-341. Kelly’s’end, drive cross-section and joint are all processed and tested comform to API criterion.  

The Main Technical Specification of Kelly ( Square& Hexagonal ) 

Norminal Size (in)	Length(ft)	Top Upset Joint		Bottom Upset Joint		Bore D	Drive Section
		API BOX Thread Left Hand	Du	Right Hand Connections	DL		Across Corners	Across Flates
3-1/2	40	6 5/8REG	7 3/4	NC38(3 1/2IF)	4 3/4	2 1/4	4.437	3 1/2
4-1/4	40	6 5/8REG	7 3/4	NC46 (41F) NC50(4 1/2IF)	6~6 3/8 6 1/8~6 3/8	2 13/16	5.500	4 1/4
5-1/4	40	6 5/8REG	7 3/4	NC50 5 1/2FH	7	3 1/4	6.750	5 1/4
6	40	6 5/8REG	7 3/4	NC50	7 3/4	3 1/2	7.625	6

 

We are responsible for customers, strictly implement the standard specifications, and provide high-quality products and service. Sincerely hope to establish good trade relationship with all friends at home and abroad.