|
| Brand Name: | HLDRILL |
| Model Number: | 28R17/R19/R22/R25 |
| MOQ: | 10PCS |
| Price: | Please Contact Us |
| Payment Terms: | T/T |
| Supply Ability: | 3000 PCS Per month |
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.
Address
4F,6# Building,No.19 Hunan Road,Liaocheng City,Shangdong province,China
Tel
86-0635-8278268
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