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Audited Supplier Audited by an independent third-party inspection agency
- Material: High-strength alloy steel (23CrNi3Mo/Sandvik 64 bar equivalent)
- Thread Type: T38/R32 (optional) - Diameter: 32mm/39mm/46mm/52mm (round); 22mm/25mm/28mm (hex) - Length: 600-6400mm (customizable) - Application: Open-pit mining, quarrying, tunneling, bench drilling
- Features: High wear resistance, excellent impact resistance, long service life
Core Advantages of Drill Collars vs. Regular Drill Pipes (Concise Summary)
1. **Delivers Drilling Weight for Hard Rock Penetration**: 2-3x denser (high-alloy steel), converting its own weight into drilling pressure to penetrate deep, hard rock-something regular lightweight drill pipes can't achieve.
2. Maintains Wellbore Verticality: Exceptionally rigid and non-bendable, acting as a "guiding backbone" to prevent deviation, unlike flexible regular drill pipes that skew in deep drilling.
3. Superior Durability for Harsh Conditions: Special heat treatment enhances compression, torsion, and impact resistance. Service life is 1.5-2x longer than regular drill pipes, withstanding high-frequency vibration and complex stresses.
4. Stabilizes Drilling Path & Boosts Efficiency: Reduces bit wobble to improve precision, lowers stuck pipe/cave-in risks, and avoids operational interruptions-issues common with regular drill pipes.
*** Key Difference
- Regular Drill Pipes: Focus on mud conveyance and torque transfer; lightweight, flexible, suitable for shallow-to-medium drilling or auxiliary use.
- Drill Collars: Focus on drilling weight supply and wellbore stabilization; heavy, rigid, core load-bearing component for deep, hard-rock drilling.
| No. | Specification | |
| 1 | Drill Rod Type | Male-Male Rod, Male-Female Rod |
| 2 | Thread | R22, R25, R28, R32, R35, R38, T38, T45, T51 ST58/ST68 GT60 etc. |
| 3 | Rod size | Hex 22mm, hex 25mm, hex 28mm, hex 32mm, hex 35mm, Round 32mm, Round 39mm, Round 46mm, Round 52mm, Round 60mm, Round 76mm. |
| 4 | Length | 0.4m-6m |
| 5 | Package | in wooden case or in bundles |
Extension Rod
Produce Hexagonal and round cross sections, Hexagon 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.,
Male/Female (M/F) rod, speed rod
M/F drill steel is an alternative to couplings sleeves to include the female part of the threaded connection as an integral part of the drill steel. M/F drill steel provides more rigid connections and is easier to uncouple and handle. The service life also tends to be better than with separate couplings. The advantages of drilling with M/F steel include: Easy handling, quicker uncoupling, tighter connections, the potential to drill straighter holes, and longer service life.
For Extension Rod and M/F steel process, the below two different types of heat treatment are used to strengthen high speed and powerful percussive drill string components to maximize their performance and reliability. Longer steel larger in diameter, conventional extension steel, Hexagonal and round cross sections are available.
- Carburization is a process used to harden the entire rod surface both internally and externally to strengthen and extend the life of the rod.
- High Frequency Induction is a process where only the thread ends of the rod are hardened to lengthen thread life.
Extension rod size
R32-Round32-R32 length 3 4 6 8 10 12 ft
T38 (R38) Round39-T38 (38), length 4' 6' 10' 12'ft
T45 -Round46-T45, length 10' 12' 14' 20' ft
T51 -Round52-T51, length 12' 14' 20' ft
MF rod /speed rod size
MF-rod R32-Round32-R32, length 3 4 5 6 10 12 14 ft
MF Rod T38-Round39-T38, length 4 5 6 10 12 14 ft
MF Rod T45-Round46-T45, length 5 6 10 12 14 20 ft
MF Rod T51-Round52-T51, length 6 12 14 20 ft
MF Rod ST58-Round60-ST58, length 12 14 20 ft
(1)Steel grade: 20CrNi3Mo equivalent to SANDBAR 64
SIZE: Hex. 22mm. Hex. 25mm, hex. 28mm. Hex. 32mm hex. 35mm
Dia. 32mm. Dia. 38mm, dia. 45mm dia. 51 mm
(2) Thread: R22, R25, R28, R32, R38, T38, T45, T51, ST58
(3)Length: 0.4m-10m
(4)Package: In wooden case or in bundles.
(5)Productivity: 20000MT / month
Company Information
Qideli are a famous drilling tool manufacturer in China since 1990
We Support :
1.DTH Hammer & button bit, drill rod
2.Top hammer bit & shank adapter & drill rod
3.Taper bit, taper rod
4.New and used air compressor and drilling rig
Our products have a great advantage both in price and quality, as well as gotten good reputation from our customers from South Africa, Iran, Malaysia, Burkina Faso, South Korea, Japan, Spain, and the Middle East ETC,more than 50 countries or regions
The information you may like to know before order:
1. Methods of Payment:
T/T (Telegraphic Transfer) or Western Union or L/C at sight
2. Handling time for an order
Based on order quantity, normally it takes 25 days for production.
Only 2 or 3 days if we have stock on your request size.
3. Shipping way
Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air
Bulk order: we suggest by air or by sea.
4. Quality Control
We have our own experienced QC.
There will be strict inspection and testing for every order before shipping out.
5. After Services:
a. Our sales team will response for your question within 24 hours (Holidays Excluded)
b. Technical Support will be available in any time
c. Free replacement will provide once the failure confirmed caused by our product quality
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