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MM Extension Rod

MM Extension Rod Product details: Extension rods are made by hollow drill steels; there are two shapes of extension rods, round type and hexagonal type. This hollow hole are usually named flushing hole, used for transmitting water or air during drilling. And the threads can be used for...
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MM Extension Rod

Product details:

Extension rods are made by hollow drill steels; there are two shapes of extension rods, round type and hexagonal type. This hollow hole are usually named flushing hole, used for transmitting water or air during drilling. And the threads can be used for connecting couplings, shanks, couplings or button bits.

 

Hexagonal cross sections rods are more rigid, heavier and transfer energy more efficiently, while increasing flushing.

Round rods are generally lighter than hexagonal rods and are normally used in extension drilling applications.With the longer steel tending to be larger in diameter, conventional extension steel is characterized by a duplicate thread on each end of the steel.

Rods
Dimension

Length

Driven Thread

Suitable Bits Thread

Drilling Hole Range

M-M

mm

foot

mm

inch

Hex.25

915~3700

3~12

R25, R28, R32

 R25

33~51

1 19/64~2

Hex.28

2100~4920

6 3/4~16

R28, R32, R38

R28

37~51

1 29/64~2

Hex.32

2400~5530

7 7/8~18

R28, R32, R38, T38

R32

40~64

1 37/64~2 1/2

Hex.35

2670~6100

8 5/8~20

R32, R38, T38

R32

45~76

1 3/4~3

Round 32

915~4310

3~14

R32, R38, T38

R32

45~64

1 3/4~2 1/2

Round 39

610~6095

2~20

R38, T38, T45

T38, T45

57~89

2 1/4~3 1/2

Round 46

1830~6095

6~20

T38, T45, T51

T45, T51

70~102

2 3/4~4

Round 52

3050~6095

10~20

T45,  T51

T45, T51

76~127

3~5


How to order?
Length + Thread + Body Shape and Diameter

 

Product Advantage:

1. Reliable and guaranteed quality.

2. Very competitive price

3. Wide range of products to meet the different markets' customers

4. Develop new according to the different market

5. OEM IS AVAILABLE

 

FAQ:

1. Can I expect a quality products?

A: Yes. mature production technology ensuring the quality satisfy international request.


2. How to check the product are the exact one you want?

A: If possible, please attach one reference picture to avoid any misunderstanding or any links from ourwebsite for a better understanding.


3. How to make sure the quality?

More than 40 Years engineer to make sure the quality, 100% inspection


4. Fast delivery time:

A: Usually it takes 25 days for production.only 3 or 5 days if we have stock of your request size.


5. Competitive price:

A: KINGDRILLING factory can supply you the lowest price due to direct sale to customers without distributor!


6. Product feature

Kingdrilling DTH tools are forged by advanced electron-hydraulic forging hammer, and harness process is managed by multipurpose furnace heat treatment.

 


Hot Tags: MM extension rod, China, manufacturers, price, in mining, made in China
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