Bulroc BR4 DTH Valved Hammers

Valved-Type Hammer - BR4 (4.13" to 5.00") diameter holes

The BR4 is a valved-type hammers designed for high performance at low operating air pressures. Simplicity of design, ease of service, and low air consumption are all factors that combine to make these hammers robust and reliable drilling tools. Both hammers are available as standard with a 2 3/8"API regular pin.

The BR4 hammer incorporates a positive fitting check valve to guard against the ingress of ground water debris when the air is shut off.

Technical Specifications

		Component Parts
		Ref.		Description
		1		Wearsleeve
		2		Inner Cylinder
		3		Bearing
		4		Piston
		5		Air Metering Plug
		6		Beveled Valve Housing
		7		Centralizer
		8		Disc Valve
		9		Valve Chest
		10		Backhead
		11		Backhead 'O' Ring
		12		Bit Retaining Ring
		13		Backhead Spacer
		14		Chuck
		15		Chuck Seal
		16		Check Valve
		17		Spring
		18		Split Spacer
		Hammer Specifications
		Weight (less bit)		76 lbs.
		Length (less bit)		35.9"
		Outside diameter		3.75"
		Piston weight		4.8 lbs.
		Stroke		6"
		Air Consumption
		PSI		CFM
		100		200
		150		300
		200		400
		250		500

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