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R28 Reaming Drill Bits

Reaming drill bits play a crucial role in achieving precise hole dimensions and improving hole quality. Whether in mining, construction, or manufacturing, the use of R25 reaming drill bits contributes to more accurate and well-finished holes.R28 reaming drill bits are a specific type of drill bit designed for reaming operations, where the primary objective is to enlarge an existing hole to achieve a more precise diameter or improve the finish of the hole. The designation "R28" typically refers to the thread type and size of the drill bit.

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Product Details

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.

Reaming Operation:

Reaming drill bits are specifically designed for the reaming process, where the drill bit is used to enlarge an existing hole. This process is often employed to achieve a more accurate diameter, improve hole straightness, or enhance the surface finish of the hole.

Product	Button Bit
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

Reaming Button Bit

Diameter

No×button diameter

Flushing hole

Weight
approx
kg

TIANYUE P/N

inch

Front

Gauge

Angle

Front

Side

Reaming bit 6°

R28 Reaming Drill Bits

2 1/2

2×10

8×9

35°

0.8

1441-646-210/89-45-41

2 1/2

4×8

8×9

25°

0.8

1441-646-48/89-45-41

2×11

8×11

35°

1.2

1441-766-211/811-45-41

4×10

8×10

30°

1.2

1441-766-410/810-45-41

3 1/2

4×11

8×11

35°

1.7

1441-896-411/811-45-41

3 1/2

4×10

8×10

30°

1.7

1441-896-410/810-45-41

Pilot adapter 6°

R28 Reaming Drill Bits

1 1/32

12×8

1.5

1442-26R28-12/8-42-22

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.

Applications:

Reaming drill bits find applications in various industries, including mining, construction, and manufacturing. They are used when a higher level of precision is required in hole diameter or when achieving a smoother hole surface is critical.

Button Shape
	R：Round Utility carbide shape. Stong configuration against carbide fracture.
	B:Ballistic Higher penetrating carbide shape than Semi ballistic shape. Recommended for soft rock.
	BB：Semi Ballistic Combined wear resistance and high penetration rate. Recommended for medium-hard rock with moderate abrasitivity.
	SA:Spike Highest penetrating carbide shape. Weak configuration against carbide fracture. Recommended for soft to medium-hard work.

Sizes and Variations:

R28 reaming drill bits come in various sizes to accommodate different reaming requirements. The selection of the appropriate size depends on factors such as the desired final hole diameter and the specific tolerances needed.

Compatibility:

It's important to ensure that R28 reaming drill bits are compatible with the drilling equipment being used. This includes checking the thread type to match the threaded components of the drilling rig.

Actual pictures of drill bits

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

R28 Reaming Drill Bits

Bit process flow

About US

R28 Reaming Drill Bits

Packing

Material and Construction:

R28 reaming drill bits are typically constructed from high-strength materials such as tungsten carbide for the cutting edges. The body of the bit is made from alloy or tool steel to withstand the forces encountered during reaming.

Maintenance:

Regular inspection and maintenance of reaming drill 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 reaming operation.

Reaming drill bits, including those with an R28 thread type, play a crucial role in achieving precise hole dimensions and improving hole quality. Their use is valuable in applications where accuracy and a high-quality finish are paramount.

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