Yanggu Henglong Construction Machinery Co., Ltd.
| Body Material | 42CrMo alloy steel |
| Payment Terms | T/T |
| Bit Diameter | 28 mm |
| Flute Style | Spiral / straight flute |
| Max Regrinds | 3 |
| Delivery Time | 7-15 Days |
| Carbide Grade | YG8 / YG6 / YG11C |
| Packaging Details | Wooden Boxes , Cardboard Boxes |
| Working Pressure | 0.5 - 0.7 MPa |
| Blade Count | 4 blades |
| Supply Ability | 3000 PCS Per month |
| Thread Type | R17/R19/R22/R25 |
| Connection Type | Threaded or taper fit |
| Model Number | 28R17/R19/R22/R25 |
| Certification | ISO 9001 Certified |
| Brand Name | HLDRILL |
| Place of Origin | CHINA |
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Product Specification
| Body Material | 42CrMo alloy steel | Payment Terms | T/T |
| Bit Diameter | 28 mm | Flute Style | Spiral / straight flute |
| Max Regrinds | 3 | Delivery Time | 7-15 Days |
| Carbide Grade | YG8 / YG6 / YG11C | Packaging Details | Wooden Boxes , Cardboard Boxes |
| Working Pressure | 0.5 - 0.7 MPa | Blade Count | 4 blades |
| Supply Ability | 3000 PCS Per month | Thread Type | R17/R19/R22/R25 |
| Connection Type | Threaded or taper fit | Model Number | 28R17/R19/R22/R25 |
| Certification | ISO 9001 Certified | Brand Name | HLDRILL |
| Place of Origin | CHINA | ||
| High Light | R17/R19/R22/R25 Thread Roof Bolting Bit ，28mm Diameter Anchor Drill Bit ，Pneumatic Rock Drill Compatible Roof Bolt Bit | ||
R17/R19/R22/R25 Thread 28mm Diameter Roof Bolting Bit Pneumatic Rock Drill Compatible Anchor Drill Bit
Our 28R series anchor bits cover R17, R19, R22, and R25 thread options. Taking the widely adopted 28R17 model as the core, this 28 mm anchor drill bit is built for roof bolting works in coal mine reinforcement projects. It delivers stable performance under rigorous underground conditions, with balanced structural strength and abrasion resistance to suit variable hard rock layers.
| Thread | R17 |
|---|---|
| Diameter | 28 mm |
| Carbide Grades | YG8 for hard rock; YG6 for medium-hard rock |
| Connection | Threaded or taper fit |
| Flute Style | Spiral / straight flute for reliable cuttings evacuation |
| Working Air Pressure | 0.5 – 0.7 MPa, matched with pneumatic rock drills |
This 4-blade symmetrical roof bolt bit is available in a 17–28 mm diameter range with an R17 shank. Optimized rock-breaking geometry brings high drilling efficiency, ideal for medium-hard strata such as sandstone and shale. The base body adopts 42CrMo alloy steel, fitted with YG8 / YG11C carbide inserts.
Company Details
Business Type:
Manufacturer,Exporter,Trading Company,Seller,Other
Year Established:
2018
Total Annual:
10000000-30000000
Employee Number:
30~50
Ecer Certification：
Verified Supplier
HENGLONG is an internationally recognized and leading producer of superior percussive rock drilling tools.Our high performance products include top hammer drill bits extension and tunneling rods,integral and tapered rods,shank adapters,coupling,drag bits,blast furnace tapping tools,self dr... HENGLONG is an internationally recognized and leading producer of superior percussive rock drilling tools.Our high performance products include top hammer drill bits extension and tunneling rods,integral and tapered rods,shank adapters,coupling,drag bits,blast furnace tapping tools,self dr...
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