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Raise Boring Drill Pipe size from 8" to 15"

1. ETERNAL company specialize on manufacturing raise boring drill pipe from 8” to 15”, which is applicated to bore all kinds of tunnel and shaft. In the past years, RBM drill pipe ( drill rod ) has been exported to many countries, such ash South Africa, Brazil, Chile, Mexico, Russian, Vietnam, Korea etc, It could be installed on the machine of Sandvik, Atlas Copoc etc.

2. Size and technical specification

Main technical specification
Norminal size	Shoulder to shoulder length	Small bore diameter	Diam.of boreback	Length of boreback	shoudler to first spanner flat	Width of spanner flat	Shoudler to end of spanner flats	Dimension across spanner flat	Connections	Weight
A	B	C	D	E	F	G	H
in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm	in mm		kg
8”203.2	48"1219.2	4-3/4“120.7	65/32"156.4	22”558.8	11/2"38.1	23/4”69.9	81/4"209.6	67/8“174.6	63/4"R.B.-DI22	170
10”254	60”1524	4-3/4"120.7	77/16“188.9	36"914.4	11/2"38.1	23/4”69.9	81/4"209.6	8”203.2	81/4"RB-D122	345
11-1/4”286.8	60"1524	4-3/4”120.7	711/16”195.3	36"914.4	11/2"38.1	31/2”88.9	10"254	9"228	91/4"R.B.-DI22	480
12-7/8”323.9	60”1524	57/16"138.1	9”228.6	36”914.4	19/16”39.7	315/16"100	11"279	101/2”266.7	101/2"RB.-D122	640
12-7/8”323.9	120"3048	57/16"138.1	9”228.6	96”2438.4	19/16”39.7	315/16”100	11"279	101/2”266.7	101/2"R.B.-DI22	1270

3. Production features

3.1 Choose high strength forging material, including 4140, 4330V, 4330V MOD

3.2 Through quenching and tempering heat treatment, carry out sample test on each piece drill pipe

3.3 CNC turning DI22 thread with high strength, every thread has two starts

4. Material chemical specification :

C: 0.28 Min./0.37 Max. Mn: 0.45Min./0.65Max. Si: 0.1 Min./0.3 Max.

Ni: 2 Min./3 Max. Cr: 0.8 Min./1.1 Max. Mo: 0.4 Min./0.65 Max.

V: 0.05 Min./0.15 Max.

5. Mechanical property

Tensile strength : min 1035MPA Yield strength : 965MPA

Impact value :min 90J

Surface hardness :HB325-365