Tapered drill rods

• Product introduction
• Product parameters

Introduction to Tapered drill rods

Tapered drill rod effective lengths are measured from the collar to the bit end, which are usually from 0.6meter to 3.6 meters.

Parameters

• Shank sizes: Hex.19mm, Hex. 22mm, Hex.25mm
• Taper degrees: 7°, 11°, 12°.
• Length: 400 – 8000mm.

Raw material: 55SiMnMo

Package: 50 or 100 pieces with a big bundle.

Quality level:  According to different choices of customers, we offer Three quality products.

Grade A: QSAAA and GTIII can be applied to very hard rocks, III level or above and f≥12 according to Protodikonov’s hardness Coefficient of Rock.

Grade B: QSAA and G30 can be applied to IV level or above and f≥12

Grade C: can be applied to IV level or below and f≤8 rocks

Customers can choose suitable drill rods according to different harness of rock and various types of rock drilling machines.

Features

• 55SiMnMo, the most suitable raw material in China, is applied as drill rod material.
• Cost-effective, good performance with reasonable price.
• Complete types of drill rod for various drilling scenarios.
• High fatigue strength and toughness for efficient and economic drilling operation.

Specifications：

Drilling duties in tunneling, construction, mining, quarrying, etc.

The relationship between taper angle and taper end diameter
	Taper Degree	Short/Long	Taper End
	4°46’	Short Skirt	19.1mm
	7°	Short Skirt	16.0mm
	11°	Short Skirt	18.0mm
	12°	Short Skirt	16.8mm
	12°	Long Skirt	14.9mm