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R28 Cross Bit

An R28 cross bit refers to a specific type of drill bit designed for rock drilling applications, especially in mining, tunneling, and construction. The designation "R28" specifies the thread type and size of the bit, and "cross bit" indicates the particular shape of the cutting structure.

Thread Type:

The "R" in R28 stands for "round," indicating that the thread type is circular. The "28" denotes the diameter of the thread in millimeters. R28 is a standardized thread type used in the drilling industry to ensure compatibility with various drilling equipment.

Cross Bit Design:

The term "cross bit" refers to the shape of the cutting structure. Cross bits typically have multiple cutting edges arranged in a cross-shaped pattern. This design is effective for achieving a balance between efficient rock penetration and stability during drilling.

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Product Details

Material and Construction:

Mining cross bits are usually constructed from high-strength materials such as alloy or tool steel. The cutting inserts, often made of tungsten carbide or other hard materials, provide durability and wear resistance.

Applications:

R28 cross bits are suitable for various drilling applications, including blast hole drilling, exploration drilling, and production drilling in softer to medium-hard rock formations.

Product	Button Bits
Other Names	Button drill bit,Thread button bit,Thread drill bit,Rock drill bit,Top Hammer drill bit,Drill bit,Rock bit,Hard rock dilling tools,Rock dill tool,Rock tools,Top Hammer drilling tools,Mining drill bit
Material	23CrNi3Mo
Application	Tunnelling, Mining, Quarrying, Ore Mining,Blasting and Infrastructure Construction,Facedrilling and Bolting, Bench Drilling, Production drilling, Long hole drilling, Drifting.
Thread	R25, R28, R32, R35, R38, T38, T45, T51, ST58, ST68, GT60, SR28, SR35...
Bit Type	Thread Button Bit,Retrac Button Bit,Reaming Button Bit，Cross Bit，Chisel Bit
Skirt Design	Standard skirt, Retrac skirt, Straightrac skirt, Heavy duty skirt
Face Design	Flat face, Drop center face, Convex face, Reaming type, Cross type
Button Shape	Spherical buttons, Ballistic buttons, Conical buttons, Composite buttons
Head Diameter	28mm~152mm
Custom Design	Size,Color

Cross bit	Diameter		No×button diameter			Flushing hole		Weight approx kg	TIANYUE P/N
Cross bit	mm	inch	Front	Gauge	Angle	Front	Side	Weight approx kg	TIANYUE P/N
	38	1 1/2	14*8		-	1	2	0.6	1221-38R28-14/8-42-23
	41	1 5/8	14*8		-	1	4	0.7	1221-41R28-14/8-42-23
	43	1 11/16	14*8		-	1	4	0.7	1221-43R28-14/8-42-23
	45	1 3/4	14*8		-	1	4	0.9	1221-45R28-14/8-42-23
	51	2	14*8		-	1	4	1.1	1221-51R28-14/8-42-23

Face Design	Application
	Flat face button drill bits are suitable for all rock conditions, especially for the rock with higher hardness and higher abrasiveness. Such as granite and basalt
	Convex Face button bits are designed for fast penetration rates in softer rock.
	Drop center button drill bits are mainly suitable for the rock with low hardness, low abrasiveness, and good integrity. The bits can drill straighter holes.
	Normal Skirt For drilling in very hard and abrasive rock formations.
	Retract Skirt For drilling in loose,broken or fissured rock where it is difficult to retract the drill string due to the hole collapse.

Actual pictures of drill bits

Threaded Drill Bits Retrac Button Bits Reaming Drill Bits Cross Bit Chisel Bit

R28 Cross Bit

Bit process flow

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R28 Cross Bit

Packing

Thread Lubrication:

Some drill bits, including R28 cross bits, may feature thread lubrication to reduce friction during the drilling process. Thread lubrication helps prevent thread wear and facilitates the smooth rotation of the bit.

Sizes and Variations:

R28 cross bits come in various sizes to accommodate different drilling requirements. The selection of the appropriate size depends on factors such as the desired hole diameter and the specific geological conditions of the drilling site.

Compatibility:

It's essential to use R28 cross bits with drilling equipment that has corresponding R28 threads. Ensuring compatibility between the cross bit and the drilling rig, drifter rods, and rock drills is crucial for safe and efficient drilling.

Maintenance:

Regular inspection and maintenance of R28 cross bits are essential for optimal performance. Monitoring the condition of the cutting edges and replacing the bit when worn contribute to the efficiency and longevity of the drilling operation.

R28 cross bits play a vital role in achieving effective rock penetration in a variety of geological conditions. Mining cross bits are fundamental tools in the mining industry, contributing to the success of various drilling operations. Proper selection, usage, and maintenance are essential to ensure efficient and productive drilling in the challenging conditions of mining environments.

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