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Q345B Friction Kelly Bar Increase Pressing Position Anti Rust With Drive Rails

Good quality Piling Bucket for sales
Good quality Piling Bucket for sales
Good service,high quality of jet grouting tools.

—— Ms.Loges

We have cooperated for many years,we like the buckets and kelly bar,good performance.

—— Mr.Ranjan

We would like the products and service from emily.

—— Mr.Raja

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Q345B Friction Kelly Bar Increase Pressing Position Anti Rust With Drive Rails

China Q345B Friction Kelly Bar Increase Pressing Position Anti Rust With Drive Rails supplier
Q345B Friction Kelly Bar Increase Pressing Position Anti Rust With Drive Rails supplier

Large Image :  Q345B Friction Kelly Bar Increase Pressing Position Anti Rust With Drive Rails

Product Details:

Place of Origin: China
Brand Name: KonDaSin
Certification: ISO9001
Model Number: Rotary drilling kelly bar

Payment & Shipping Terms:

Minimum Order Quantity: 1 piece
Packaging Details: Wrapped with plastic film
Delivery Time: 20 working days
Payment Terms: T/T, L/C, Western Union
Supply Ability: 50 Set/Sets per Month kelly bar for rotary rig
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Detailed Product Description
Applicable Industries: Building Material Shops Welding Wire: Sweden ESAB
Packing: Air Bubble Film Processing Type: Heat Treatment And Forging
Material: Q345B, 35CrMo, 27SiMn Color: Customer Required
High Light:

telescopic kelly bar


bauer kelly bar

Piling Tool Kelly Bar Rotary Machine Tools High Grade Materials High Durability


friction kelly bar type
• locks and wear-resistant drive rails (accordingly with rotary sleeve)
• Robust Terminal joints, that are the terminal part of each telescopic pipe, provided to transfer torque and crowd force to the kelly bar
• bottom shock absorbers
• standardised square kelly drive stub for connecting all types of drilling tools


  • The kelly bar is most important for rotary machine therefor it must be treated with as much careful as the drilling rig,the tool and bits in order to ensure drilling performance.Kelly bar are designed for the purpose of transferring torques and pressures onto a drilling tool.
  • Interlocking and friction is two types we can provide now,kelly bar length depends on actual needs of customers or the drilling machines' parameters.
  • A kelly bar in a system of drive keys and lock recesses weld onto their outer surface which has 2-5 telescopic tubular sections.
  • With High torsional coefficient,the compression and vibration resistance of kelly bar is higher than average level,high efficient in rock drilling construction.
  • In each section,normally kelly bars are matched with a total of 6 drive keys.High grade materials and special welding process guarantee a high durability and wear risistance of our kelly bar.
  • The key parts of kelly bar like drive key which is widely used heat treatment to improve wear resistance.


Frictional kelly bar

Friction kelly bar,from its name which means it transfer torque to the drilling tool by friction. The telescopic elements are advanced by using the “frictional contact” from each of the friction drive rails that run down the outside of each kelly bar. These drive rails, on the outside of each kelly bar, are driven by the rotary table and the terminal joints of each successively larger diameter kelly bar. The terminal joint is long piece on the inside and at the bottom of each kelly bar. Friction kelly bars are normally supplied in 4 or 5 telescopic elements as they are mostly used for deep piles in medium hard soil conditions.

This type of the kelly bar is suitable for soft ground and mud, mud, (mud) sand, gravel layers.


Interlocking kelly bar

Interlocking kelly bar  are especially designed for drilling into hard materials and when crowd force application is required.Locking kelly bars are provided with drive rails designed with locking pockets on their length and corresponding termina joints locking guides. The purpose is to interlock each telescopic element to the inner following one in order to apply the maximum torque and crowd force developed by the base rig.Therefore the rotary table inner drive is also equipped with locking pockets,. When extracting the locking bar from down the hole, the combination of lifting and rotating counterclockwise will allow the telescopic element to unlock. interlocking Kelly bars are usually supplied with 3 or 4 telescopic elements.


Name of product

External diameter

Pitch No

Length section

Rated torque


Friction kelly bar 355 4,5 10-13 180 36-60
377 4,5 10-14 200 36-65
406 4,5 10-15 210 36-70
419 4,5 10-15 250 36-70
440 4,5 10-15 250 36-70
470 4,5,6 10-17 280 36-95
508 4,5,6 10-18.5 320 36-103
530 4,5,6 10-19 380 36-106
575 4,5,6 10-21 420 36-120
630 4,5,6 10-21 450 36-120


Name of product

External diameter

Pith No

Length section

Rated torque


Interlocking kelly bar 355 3 10-13 180 27-36
377 3,4 10-12.5 220 27-44
406 3,4 10-15 230 27-57
419 3,4 10-15 250 27-57
440 3,4 10-15 250 27-57
470 3,4 10-17 280 27-65
508 3,4 10-17 320 27-65
530 3,4 10-20 380 27-76
575 3,4 10-21 420 27-80
630 3,4 10-21 450 27-80

1. The advantages of our Kelly bar, such as low weight, high strength, high abrasion-resistance, high-reliability are safeguarded.
2. Main body made of alloy hot-treated specially enjoy both high hardness and perfect welding performance, high abrasion-resistance leads to  high-reliability.
3. Heat treatment is widely used in the key parts such as drive key to improve wear resistance
4. Small clearance and high-precision mating of the drill pipe ensure its good working order and service performance.
5. Fulfill the rotary drilling rig full torque operation.

Kelly bars is to transfer to the drilling tools both the torque and the pressure produced by the drilling machine,it candrill in dense sand and gravel and weak to strong rock.
Q345B Friction Kelly Bar Increase Pressing Position Anti Rust With Drive Rails


Contact Details
Kondasin International Co.,Ltd.
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