China R28 Thread Reaming Bit Split Type Rock Drill Bit For Center Hole Reaming for sale

R28 Thread Reaming Bit Split Type Rock Drill Bit For Center Hole Reaming

Name: R28 Thread Reaming Bit Split Type Rock Drill Bit For Center Hole Reaming
Brand: Yanggu Henglong Construction Machinery Co., Ltd.

R28 Thread Reaming Rock Drill Bit for Center Hole Reaming Reaming rock drill bits, also known as pilot reamer bits, are hole openers that drill a pilot hole to a certain depth and then ream the hole to a larger diameter. Primarily used for center hole reaming in long hole drilling, these bits come in threaded varieties including integral reaming bits (dome type, pilot type) and split-type reaming bits. Product Specifications Parameter Value Thread R28 Diameter 102mm No.

Product Advantages High concentricity, stable drilling, long service life

Place of Origin CHINA

Tilt Structure Reaming Cutting Structure

Product Name R28 Threaded Reaming Rock Drill Bit

Packaging Details Wooden Box

Product Specifications R28 Threaded Connection

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Product Description

R28 Thread Reaming Rock Drill Bit for Center Hole Reaming

Reaming rock drill bits, also known as pilot reamer bits, are hole openers that drill a pilot hole to a certain depth and then ream the hole to a larger diameter. Primarily used for center hole reaming in long hole drilling, these bits come in threaded varieties including integral reaming bits (dome type, pilot type) and split-type reaming bits.

Product Specifications

Parameter	Value
Thread	R28
Diameter	102mm
No.×Buttons Dia	1×10mm, 14×12mm
Skirt Design	Normal
Weight	3.1kg
Carbide Design	Spherical
Face Design	Dome
Carbide Brand and Grade	ZCC/YK05
Steel Grade	45CrNiMoVA

Functional Overview

In top hammer drilling, dome reaming bits and pilot reaming bits serve specific functions in the drilling process:

Pilot Drill Bit

Function: In down-the-hole hammer drilling, the pilot drill bit drills the initial pilot hole with a smaller cutting diameter, penetrating rock and initiating the drilling process
Application: Used at the beginning of drilling operations to create straight, precisely sized pilot holes that guide subsequent tools and maintain hole verticality

Ball-Shaped Reaming Bit

Function: Features a larger cutting diameter to enlarge the pilot hole to required final diameter, removing additional rock material
Application: Used in later drilling stages to achieve desired hole diameter, facilitating installation of larger equipment or casing

This sequential use of different drill bits ensures drilling accuracy, efficiency, and operational control in down-the-hole hammer drilling applications.