Bulroc Hyper 81 DTH Hammer

Hyper 81 Valveless Hammer - 8" to 10" diameter holes

The Hyper 81 is a valveless DTH Hammer designed for drilling 8" to 10" diameter holes over a wide range of operating air pressures. The Hyper 81 is supplied with a 4 1/2" API regular pin backhead as standard, but other connections are available on request. A positive fitting water check valve guards against ingress of ground water when the air is shut off.

The Hyper 81 Hammer is designed to accept Button Bits with a shank and footvalve identical to the Ingersoll Rand DHD 380. However, the Hyper 81 can also be supplied to accept the Sandvik Mission SD8 type of Button Bit.

Technical Specifications

		Component Parts
		Ref.	Description
		1	Backhead
		2	Backhead 'O' Ring
		3	Check Valve
		4	Check Valve Spring
		5	Diverter
		6	Compression Ring
		7	Tube Holder
		8	Tube Buffer
		9	Control Tube
		10	Piston
		11	Piston Retaining Ring
		12	Bit Retainer Ring
		13	Chuck
		14	Chuck Release Washers
		15	Wearsleeve
		Hammer Specifications
		Weight (less bit)	429 lbs.
		Length (less bit)	55.47"
		Outside diameter	7.25"
		Piston weight	100 lbs.
		Stroke	4.00"
		Air Consumption
		PSI	CFM
		150	479
		200	738
		250	1031
		300	1355

Top of Page