Extension Rod
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General Introduction:
PLATO drifting and extension drill rods are for in drifting, tunneling, long-hole drilling, bench and production drilling industries. These rods are produced with round or hexagonal sections in all common thread designs, and in Male/Male (M/M) or Male/Female (M/F) connections. All our drifting and extension drill rods are heat-treated with carburization or high frequency, combinated with phosphorization.
The round cross sections are more prevalent for extension drilling applications. A round rod has less material and thus is lighter to handle and less expensive than an equivalent size hexagonal rod. While hexagonal rod is particularly advantageous for drifting and tunneling drilling. The increased rigidity of hexagonal drill rods enables them to abating hole-deviation and enhances flushing for cleaning holes. Even with the larger cross section, hexagonal steel can still accommodate the same diameter bit as that of an equivalent round steel.
M/F rods provides tighter connections and is easier for handling and quicker for uncoupling than M/M rods, and are potential to drill straighter holes.
Carburization technique is mainly used in the production of big diameter rods to ensure excellent performance. Carburizing is for hardening entire rod to provide an external over entire rod surface area. Carburized steels are used primarily in underground applications and where water is used as a flushing medium. High Frequency technique is primarily used in the production of small diameter rods to reduce fragileness of drill steels. High Frequency is for hardening only the thread ends of the rod. This provides the longevity of the product as well as being more suitable for more drilling condition need. Steels produced with this technics primarily used in surface drilling applications where air is the primary flushing medium. Phosphorising is to improve anti-erosion capability of the entire external rod surface area.
| Product | Top Hammer Rock Drilling Tool - Drill Rod |
| Other Names | top hammer drill rod, threaded drill rod, rock drill rod, mining drill rod, thread rock drill rod |
| Material | Structural Alloy Steel |
| Application | Tunnelling, Mining, Quarrying, Blasting and Infrastructure Construction |
| Facedrilling and Bolting, Bench Drilling, Production drilling, Long hole drilling, Drifting | |
| Thread | R22, R25, R28, R32, R35, R38, T38, T45, T51, GT60, ST58, ST68, etc. |
| Rod Type | MM rod (Male/Female thread): Extension rod, Drifter rod |
| MF rod (Male/Male thread): Speedrod, MF drifter rod | |
| Drill tube, Guide tube | |
| Body Type | Hexagonal drill rod, Round drill rod |
| Diameter | 20mm~87mm |
| Length | 260mm~6400mm |
| Custom Design | Acceptable |
Specification Overview:
| Rods Dimension | Length | Driven Thread | Suitable Bits Thread | Drilling Hole Range | ||||
| M-M | M-F | |||||||
| mm | foot | mm | foot | mm | inch | |||
| Hex.25 | 915 ~ 3700 | 3 ~ 12 | 610 ~ 1220 | 2 ~ 4 | R25, R28, R32 | R25 | 33 ~ 51 | 1 19/64 ~ 2 |
| Hex.28 | 2100 ~ 4920 | 6 3/4 ~ 16 | 1220 ~ 3050 | 4 ~ 10 | 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 | ||
| Round32 | 915 ~ 4310 | 3 ~ 14 | 915 ~ 4270 | 3 ~ 14 | R32, R38, T38 | R32 | 45 ~ 64 | 1 3/4 ~ 2 1/2 |
| Hex.35 | 2670 ~ 6100 | 8 5/8 ~ 20 | 3700 ~ 6400 | 12 ~ 21 | R32, R38, T38 | R32 | 45 ~ 76 | 1 3/4 ~ 3 |
| Round39 | 610 ~ 6095 | 2 ~ 20 | 610 ~ 6095 | 2 ~ 20 | R38, T38, T45 | T38, T45 | 57 ~ 89 | 2 1/4 ~ 3 1/2 |
| Round46 | 1830 ~ 6095 | 6 ~ 20 | 1525 ~ 6095 | 5 ~ 20 | T38, T45, T51 | T45, T51 | 70 ~ 102 | 2 3/4 ~ 4 |
| Round52 | 3050 ~ 6095 | 10 ~ 20 | 1525 ~ 6095 | 5 ~ 20 | T45, T51 | T45, T51 | 76 ~ 127 | 3 ~ 5 |
How to order?
Length + Thread + Body Shape and Diameter
Drill Rods Production Process
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