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28mm Outer Diameter R17 Thread Tungsten Carbide YG8 Rock Bolt Drill Bit And Anchor Drill Bit For Coal Mine Roof Bolting

Name: 28mm Outer Diameter R17 Thread Tungsten Carbide YG8 Rock Bolt Drill Bit And Anchor Drill Bit For Coal Mine Roof Bolting
Brand: Yanggu Henglong Construction Machinery Co., Ltd.
SKU: 28R17
Price: Negotiable USD
Availability: InStock

Brand Name:	HLDRILL
Model Number:	28R17
MOQ:	10PCS
Price:	Please Contact Us
Payment Terms:	T/T
Supply Ability:	3000 PCS Per month

Detail Information

Product Description

Detail Information

Place of Origin:

CHINA

Certification:

ISO 9001 Certified

Thread:

R17

Outer Diameter:

28 Mm

Carbide Grade:

YG8 / YG6

Connection Type:

Threaded (R19/R22/R25) Or Tapered Shank

Flute Type:

Spiral / Straight

Working Air Pressure:

0.5-0.7 MPa

Body Material:

42CrMo Alloy Steel

Cutter Layout:

Symmetrical 4-cutter

Bit Range:

17-28 Mm

Packaging Details:

Wooden Boxes , Cardboard Boxes

Highlight:

28mm Rock Bolt Drill Bit

R17 Thread Anchor Drill Bit

Tungsten Carbide YG8 Roof Bolting Bit

Product Description

28mm Outer Diameter R17 Thread Tungsten Carbide YG8 Rock Bolt Drill Bit And Anchor Drill Bit For Coal Mine Roof Bolting

The Henglong 28R17 anchoring bit is engineered for roof bolting holes in underground coal mine support operations. It delivers reliable tensile strength and abrasion resistance, maintaining stable drilling progress even through tough, hard rock strata.

R17 Thread
28 mm Diameter
YG8 / YG6 Carbide
42CrMo Alloy Steel

Technical Specifications

Thread	R17
Outer Diameter	28 mm
Tungsten Carbide Grade	YG8 for hard rock; YG6 for medium-hard rock
Connection	Threaded (R19 / R22 / R25) or tapered shank
Flute Type	Spiral or straight flute for fast cuttings evacuation
Working Air Pressure	0.5–0.7 MPa, matched with pneumatic rock drills

Anchor Bit Range

We supply anchor bits covering 17–28 mm in the R17 series. The symmetrical 4-cutter layout maximizes rock-breaking efficiency and is perfectly suited for medium-hard formations, including sandstone and shale.

Body material: 42CrMo alloy steel, fitted with YG8 / YG11C carbide inserts.

Operational Guidelines

1 Shank Matching Confirm the bit connection (threaded or tapered) fits your drill rig adapter before installation.
2 Bit Selection by Ground Condition Cross-type bits are preferred for soft rock to boost penetration speed. Button / ball-tooth bits are recommended for hard rock to slow down carbide wear.
3 Cooling & Slag Discharge Adopt compressed air or water mist cooling to avoid thermal damage. Periodically clear rock dust inside boreholes to prevent rod jamming.
4 Service Life Control Proper regrinding can extend usable life by roughly 30%. We advise no more than three regrinds. Replace bits once heavy wear appears to prevent borehole deviation.

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