Large Diameter DTH Hammers

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Website: http://rockdrilltool-en.com/large-diameter-dth-hammers-1-2-2.html

Technical Specifications

Item	12"	14"	18"	24"	28"
Length without bit	1698.5mm	1954mm	1954mm	2543.5mm	2529.5mm
Weight without bit	551kg	894kg	1493kg	2598kg	3990kg
Hammer OD	275mm	330mm	406mm	525mm	645mm
Bit shank	DHD112	PWD14	NUMA180	PWD24	PWD28
	NUMA120/125	NUMA125		NUMA240	NUMA280
	SD12	-		-	-
Recommended hole diameter	Ø305-Ø400mm	Ø400-Ø500mm	Ø500-Ø650mm	Ø650-Ø800mm	Ø800-Ø1000mm
Thread connection (top sub)	API6 5/8" REG	API7 5/8" REG	HEX	HEX	HEX
Max. working pressure	3.5MPa	3.5MPa	3.5MPa	3.5MPa	3.5MPa
Impact frequency	18bar, 23Hz	18bar, 22Hz	18bar, 18Hz	18bar, 16Hz	18bar,12Hz
Recommended rotation speed	15-40r/min	15-40r/min	10-25r/min	5-15r/min	2-8r/min
Air consumption	18bar, 70m³/min	18bar, 85m³/min	18bar, 110m³/min	18bar, 130m³/min	18bar, 145m³/min

How can it be determined whether a DTH hammer has reached the end of its service life?

A DTH hammer is generally considered to be approaching the end of its service life when one or more of the following conditions are observed:

A significant increase in air consumption from the compressor, accompanied by a noticeable drop in operating pressure
Reduced impact force, resulting in weakened rock-breaking performance and lower drilling efficiency
Severe external wear, particularly when the wrench flats on the hammer connections are worn nearly smooth

How are the products packaged for delivery?

Standard packaging is provided using fumigation-free plywood crates. This packaging method is suitable for sea freight, air freight, and long-distance international transportation, ensuring safe handling and delivery.