DTH Sub Adapter Down the Hole Hammer Rod Adaptor

A cross over sub can also be used just above the bit or in a reverse circulation application to deliver outgoing air to the bit face. In these applications a cross over sub is usually called a BIT SUB. All of our cross over subs can have wrench flats milled into them to allow for better assembly and disassembly.
Our Sub are of the highest quality ,are manufactured to exacting specifications using advancing maching technoogy. They are manufactured from seamless steel tube by cold drawn.The material which meets the global standard. Sub are made from quality heat treated materials which ensure superior strength, wear resistance and toughness in the most demanding applications Sub are manufactured under stringent industry standards, and are field tested under a variety of conditions.

Cross over subs act as an intermediary between two dissimilar threads and are used to connect the two. There are some other uses for cross over subs as well. A crossover sub can be used to protect other tooling in your drill string. Since the cross over sub is the least expensive item in the drill string it can be designed to wear before any other drilling component does. In this application a Cross over sub is often called a SAVER SUB. The Saver Sub is used to connect the entry side swivel to the first piece of pipe and is attached to every pipe, going in and coming out. This position in the string is subject to much wear, so saver sub was designed to be an inexpensive, easily replaceable part. As such, it is used to protect the threads on the actual pipe and allows for a quick and onsite replacement. Using saver sub offers great advantages, as it is cheaper to change a saver sub often, than to buy new pipe once.
We adopts famous domestic large steel enterprises production of material to produce drill pipe, and heat treatment of materials by using an integrated multi-processing furnace, professional CNC machining was applied in all of the connection thread processing, all the threads are configured thread gauge, which are in accordance with international standard, Internal thickening technology has carrued on the tempering process after friction welding, so the processing quality of drill pipe is stable, reliable, use cycle greatly extended. We can process different length, diameter and wall thickness and material of API standard thread rod, we also can design and manufacture drill pipe according to customers' requirement of the material, length, wall thicknessa and connection thread.

Female A	Male B	Diameter A	Diameter B	Length
2 3/8API Reg	2 3/8API Reg	77	77	140
2 3/8API Reg	2 3/8API Reg	90	90	140
2 3/8API Reg	2 3/8API Reg	102	102	130
2 3/8API Reg	2 3/8API Reg	90	90	144
2 3/8API Reg	2 3/8API IF	95	95	130
2 3/8API Reg	2 7/8API Reg	90	102	120
2 3/8API IF	3 1/2API Reg	90	90	164
2 7/8API Reg	2 3/8API Reg	90	90	154
2 7/8API Reg	2 3/8API Reg	90	115	120
3 1/2API Reg	3 1/2API Reg	115	115	219
3 1/2API Reg	2 3/8API IF	115	115	160
3 1/2API Reg	2 7/8API Reg	115	115	160
3 1/2API Reg	2 7/8API IF	115	115	160
3 1/2API Reg	3 1/2API Reg	115	115	160
3 1/2API Reg	4 1/2API Reg	146	146	132
4 1/2API Reg	3 1/2API Reg	146	115	235
F48x10	F42x10	59	59	203
F48x10	F48x10	59	59	203
F48x10	2"API Reg	59	59	203