Diamond Bullnose Router Bit R 30 – Precision Edge Profiling for Professional Use
Clean, Consistent Rounding with the Diamond Bullnose Router Bit R 30
The Diamond Bullnose Router Bit R 30 (Item No. 50382) is engineered for professional tile setters, stonemasons, and contractors who require clean, precise edge profiles on materials such as granite, marble, quartz, porcelain stoneware, and other natural or engineered stones. With a 30 mm radius, this high-performance tool produces a half-round (bullnose) profile, ideal for visible edges where accuracy, durability, and a premium finish matter most.
Practical Applications on Site and in the Workshop
The R 30 bit proves its value wherever visible stone edges need to be safely and cleanly rounded, even under tight deadlines or on changing job sites:
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Stair treads and landings – Creates uniform round edges on granite or porcelain steps, indoors and out.
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Worktops and washbasins – Softens sharp corners and delivers a professional, tactile finish.
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Window sills and cover plates – Improves both the appearance and feel of exposed edges.
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Skirting and wall cladding – Harmonious transitions and aesthetically pleasing details.
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Pool edges and outdoor stonework – Safer, weather-resistant edges for seating areas and basin surrounds.
Key Advantages over Conventional Solutions
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Smooth rounding without chipping – The continuous diamond segment ensures even profiles without breakout.
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Long service life under high load – The vacuum-brazed diamond coating withstands intensive, daily use.
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Fast material removal with full control – The coarse grit (approx. 30–60) enables efficient shaping while maintaining guidance precision.
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Universal compatibility – The 22.23 mm borehole fits most grinders and profiling machines with standard adaptors.
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Dry and wet use – Ideal for quick jobs in hard-to-reach places, with wet operation recommended for best results and tool longevity.
Technical Specifications – Diamond Bullnose Router Bit R 30
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Diameter: 75 mm
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Radius (profile): 30 mm – Half-round / Bullnose
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Borehole: 22.23 mm – for flange nuts up to 42 mm
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Diamond coating: Vacuum-brazed, continuous edge
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Grit size: approx. 30–60 – for rough profiling
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Application: Wet and dry use
Compatibility & Recommended Accessories
The R 30 router bit features a standardised bore, making it compatible with most UK and European machines:
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Angle grinders (with appropriate adaptor or flange)
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Router motors and profiling machines
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Bench-mounted polishing or shaping systems
Recommended accessories for extended application:
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Water-cooled router motors
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Resin polishing pads for fine finishing
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Adaptor flanges and spacer rings
Application Tips & Maintenance
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Wet cutting is advised to protect the diamond layer and minimise dust – ideal for extended use.
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For short dry applications, especially in tight areas, ensure regular cooling breaks.
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To maintain cutting performance, clean the diamond surface using an abrasive stone or concrete block.
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For a fine finish, follow up with a resin or polishing profile wheel.
Engineered for Daily Professional Use
Built for durability and precision, the R 30 bullnose bit ensures consistent, clean results even under demanding site conditions or batch processing. Its robust design and high-quality diamond segment make it a go-to solution for professionals aiming for top-tier results without compromise.
FAQ – Diamond Bullnose Router Bit R 30
1. Will it fit my angle grinder?
Yes – the 22.23 mm borehole fits most standard UK angle grinders.
2. Can it be used dry?
Yes, for short durations. However, wet use is highly recommended to improve tool life and cutting quality.
3. What materials can it shape?
The bit is suitable for granite, marble, quartz, porcelain stoneware, and similar dense stone materials.
4. What is the radius of the profile?
The profile has a 30 mm radius, ideal for bullnose or half-round edges.
5. Are spare parts or accessories available?
Yes – compatible router motors, diamond cleaners, and polishing accessories are available from Karl Dahm.
6. How do I clean the diamond surface?
Rub briefly against a hard abrasive material like concrete or a dressing stone.
7. How long does the tool last?
Thanks to its vacuum-brazed diamond coating, it’s designed for long service life in daily professional use.
8. Is there a warranty?
Yes – this tool is covered by Karl Dahm’s manufacturer warranty. Please refer to product details for terms.
9. What are the best use cases?
Ideal for stair treads, worktops, pool edges, and window sills where a rounded, finished look is essential.
10. What grit does the tool use?
Approx. 30–60 grit, perfect for rough profiling and edge shaping.
Do you have any questions on this item?
