H22*108 Tapered Drill Rod (Z708 from Atlas)

Shank size: HEX22*108
Length: 400,800,1600,1800,2400,3200mm etc.
Taper Degree: 7°,11°,12°
Materials: Z708 from Atlas

Product details

Rock drilling tools Tapered Drill Rod is to provide a hexagonal chuck section to provide leverage for the rotation chuck bushing. It usually has a forged collar to maintain the proper shank striking face position in the rock drill, and a tapered drill bit end. Tapered steel lengths are measured from the collar to the bit end. Holes are usually drilled in 0.6 m increments to accommodate the air leg feed length. The drilled steel is extracted and followed with a slightly smaller diameter rock drill bit on the next steel length in the sequence.

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Carburization is a process used to harden the entire tapered drill rod surface both internally and externally to strengthen and extend the life of the tapered drill rod.
Shank Hexagon: 19*108 mm, 22*108mm, 25*108 mm, 25*159 mm; 6, 7, 11, 12 degree taper in most lengths, taper degree of drill steel is mostly imports for excellent drilling productivity.
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H22*108-2400mm -12° tapered drill rods
Describtion	12° tapered drill rods
Shank	H22*108
Effective length	2400mm
full length	2508mm
Painting	Black
Head treadment	34-36 HRC
Steel grade	Z708
Perforemace	For hard rock F=10-12
Air jack hammer	Y19A YT24 Y27 YT28 YT29A 7655

For drilling medium-hard to hard and abrasive rock formations, taper angles of 11 and 12-degrees are normally used on modern drill rigs, like Y6, Y10, Y24, YT24, YT27,YT28,YT29A pneumatic or other hydraulic rock drills . For low impact rock drills and softer rock formations, a narrow tape range of 7 degrees is used, such as Indian, Saudi’s granite and marble quarry. A comprehensive range of taper button bits, cross bits and chisel bits with 6, 7, 11, 12 degree taper, drill hole diameter: 28mm-57mm.

Tapered rod insert to tapered drill bits:

Tapered bits to match tapered rod