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31mm 11 Degree Spherical Tooth Drill Bit Cost Saving Taper Bit For Hard Rock Drilling
Our factory grade 31mm 11° spherical tooth drill bit features hot press tungsten carbide spherical buttons and an optimized 11 degree taper connection for stable impact transfer. Perfect for narrow blasthole drilling, mine development, quarry bolt drilling on granite, basalt, and other abrasive hard rock formations. Offers lower cost per meter, longer service life, and bulk factory supply with custom service options.
Optimal Design for Small Blasthole Drilling
For small blasthole drilling tasks requiring 28 -34mm bore diameter, mismatched taper angles and inferior button structure become significant hidden cost factors. Unlike generic tapered bits, this spherical tooth button bit balances impact resistance, abrasion resistance, and drilling speed, making it a cost effective solution for handheld jackhammers and light pneumatic rock drills.
Why 31mm Diameter + 11° Taper is Ideal for Narrow Hard Rock Drilling
Standard Small Hole Size Compatibility
31mm bore diameter is the most widely adopted specification for mine development blastholes, roof bolt drilling, small stone quarry splitting holes, and road slope anchor holes across global mid scale projects. It fits perfectly with standard 22mm taper drill rods, eliminating the extra cost of custom adapter sleeves required by non standard 30mm / 32mm bits.
Optimized 11 Degree Taper Performance
Compared to common 7° taper bits, the 11° steep taper creates tighter surface contact between bit shank and drill rod, locking impact torque for full transmission to spherical carbide teeth with no energy loss during continuous drilling shifts.
Spherical Tooth Structure Advantages
Asymmetrical spherical tooth arrangement eliminates repeated rock cutting dead zones, ensuring straight, smooth boreholes without deviation critical for accurate blasting and anchor bolt installation.
Application Scenarios
Underground metal / coal mine development : Small section drift blasthole drilling, roof and side wall bolt support holes, ventilation small hole excavation
Quarry stone splitting : Medium hard rock small diameter splitting holes for marble, granite block extraction
Municipal highway geotechnical engineering : Road slope anchor bolt drilling, tunnel preliminary support small blastholes, foundation reinforcement boreholes
Hydropower small tunnel excavation : Narrow gallery rock drilling for water diversion micro tunnels
Exploration and small geothermal projects : Shallow hard rock sampling boreholes
Real World Cost Benefit Analysis
The biggest advantage of premium taper drill bits lies in lowering total drilling cost per meter, not just cheap unit price. Verified by long term overseas clients, here are the core economic benefits :
Less downtime for bit replacement : Spherical tooth wear resistance reduces tool change frequency, lifting daily drilling footage by 12 - 22% per shift
Lower auxiliary material consumption : Straight boreholes reduce bolt, explosive and grout waste caused by crooked holes
Extended drill rod service life : Tight 11° taper connection minimizes vibration and shank impact damage, slowing drill rod wear
A mining contractor in Tanzania reported that after switching to our 31mm 11° spherical tooth drill bits, their average cost per drilled meter dropped by 17% within one month, offsetting the slight premium over low cost generic bits.
Frequently Asked Questions
What drill rod size pairs with this 11 degree taper bit?
Standard match : H22 hex taper drill rod, the global mainstream specification for handheld jackhammers. Custom taper shank sizes can be produced for special rig models.
How long is the production lead time for custom modified spherical tooth drill bits?
Standard stock items ship within one week ; customized structural adjustments take 10 -15 working days. We prioritize urgent project orders.
Conclusion
Against the backdrop of expanding global mining and infrastructure construction, optimizing small hole drilling consumables is one of the most efficient ways to control project operational costs. Our 31mm 11 Degree Spherical Tooth Drill Bit integrates scientifically calibrated 11° taper connection, wear resistant spherical carbide buttons, and site tailored tooth layout, perfectly solving core points of slow penetration, short bit lifespan, and unstable connection for narrow hard rock blasthole drilling.
If your team operates underground mine development, quarry splitting, tunnel bolt support, or slope reinforcement projects and struggles with high drill bit replacement costs, this tapered spherical tooth button bit is your reliable cost cutting drilling solution.
Reach out to our professional engineering sales team now, share your rock formation parameters and drilling rig model, and we will provide targeted product matching plans and factory direct wholesale prices.
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...
