Description

R28 Threaded Button Bits and Cross Bits Overview

This series of R28 threaded button bits and cross bits is specially designed for drift excavation blasting and anchor hole drilling in large underground metal mines.

The threaded coupling sleeve is manufactured with CNC machining.

Technical Information of R28 Threaded Button Bit

Thread connection: R28
Head material: Tungsten carbide
Bit body material: High-strength alloy steel
Flushing grooves: Distributed along the bit for chip removal and cooling
Head design: Button shape
Diameter: 38mm, 41mm, and 43mm
Gauge angles: 30 degree and 35 degree
Gauge buttons: 5×9 mm and 5×10 mm
Center buttons: 2×7 mm and 2×8 mm
Weight: 0.6kg and 0.7kg
Head manufacturing process: Hot-inlay technology
Other manufacturing processes: Full carburizing heat treatment, high-frequency treatment, and phosphating process

Technical Parameters of R28 Threaded Cross Drill Bit

Thread connection: R28
Head material: Inlaid tungsten carbide teeth
Bit body material: High-strength alloy steel
Flushing grooves: Distributed along the bit for discharging waste residue and coolant
Head design: Cross shape
HxT: 12x8mm
Diameter: 38mm and 42mm
Weight: 0.5kg and 0.6kg

Technical Specifications of the threaded Coupling Sleeve

Type: Middle stop
Thread connection: R32 and R38
Length: 160 mm and 170 mm
Diameter: 45 mm and 55 mm
Material: Forged high-strength alloy steel
Manufacturing process: Full carburizing heat treatment
Weight: 1.0 kg and 1.7 kg

Button Bit

R28 Threaded Button Bit
Thread bit, Button	D (mm)	D (inch)	Buttons Gauge (No x Size, mm)	Buttons Centre (No x Size, mm)	Gauge button angle	Thread	Order number	Weight (kg)
Button	38	1 1/2	5 x 9 mm	2 x 7 mm	30 degree	R28	B173-3807-5363	0.6
	41	1 5/8	5 x 9 mm	2 x 8 mm	30 degree	R28	B173-4107-5365	0.6
	43	1 11/16	5 x 10 mm	2 x 8 mm	30 degree	R28	B173-4307-5365	0.7
	38	1 1/2	5 x 9 mm	2 x 8 mm	35 degree	R28	B173-3807-5345	0.6
	41	1 5/8	5 x 9 mm	2 x 8 mm	35 degree	R28	B173-4107-5345	0.6
	43	1 11/16	5 x 10 mm	2 x 8 mm	35 degree	R28	B173-4307-5345	0.7