SDS Plus TCT Hole Cutters 210mm 35mm Wall Hole Saw Kit

35mm Wall Hole Saw Kit | SDS-Plus Arbor and Pilot Drill for Electrical Conduits

1. Problem: Pilot Snap and Narrow-Trench Binding

• The Problem: When drilling a smaller 35mm hole through dense brick or block, the trench is narrow. Standard core bits fail to evacuate the crushed stone dust quickly enough. The dust compacts, causing the bit to bind. Furthermore, when the center pilot drill hits hard aggregate, the sudden jarring force often snaps the pilot bit or the SDS shank.

• The Result: Burned-out rotary hammer motors, snapped pilot bits that halt production, and jagged, oversized holes that fail building inspections for conduit sealing.

2. Cause: Shallow Flutes and Brittle Alloys

• Dust Compaction: Basic masonry hole saws lack the deep exterior fluting necessary to pull heavy masonry dust out of a tight 35mm circular trench.

• High-Impact Shock: Smaller diameters drill faster, meaning they hit aggregate stones with higher frequency. Standard pilot drills and thin-walled cylinders cannot absorb this rapid high-frequency impact.

3. Solution: Deep-Spiral Evacuation and High-Impact Carbide

• Deep-Spiral Dust Flutes: The exterior of the 35mm cylinder is CNC-machined with a continuous, deep spiral groove. As the tool rotates, it acts as an auger, aggressively pulling pulverized brick and concrete dust out of the narrow trench. This prevents compaction, keeping the tool cool and increasing drilling speed by 30 percent.

• Impact-Grade Tungsten Carbide Teeth: The cutting edge features specialized, building-grade Tungsten Carbide teeth. These are high-frequency silver-brazed to the alloy body, allowing them to withstand the brutal hammering action of an SDS rotary drill without fracturing when hitting hard stones.

• Redundant Pilot System: The kit includes a heavy-duty SDS-Plus arbor and comes with spare center pilot drills. The pilot drills are designed with a reinforced web to survive high-impact masonry drilling, ensuring your technicians never experience downtime.

4. Technical Specifications

5. Professional Industry Applications

• Electrical and Wiring MEP: The definitive size for boring through brick and block walls to install 1-inch to 1-1/4 inch PVC electrical conduits and thick armored cables.

• Plumbing and Gas Lines: Precision wall penetrations for routing copper water mains, PEX manifolds, and commercial gas lines between rooms or building exteriors.

• HVAC and Climate Control: Creating clean pass-throughs for secondary refrigerant lines and condensate drain pipes in split-system air conditioning units.

6. Operation and Safety Guidelines

• Material Versatility: Optimized for Red Brick, Hollow Brick, Cinder Block, Aerated Concrete (AAC), and Mortar.

• Drilling Modes: Start the hole using "Rotary Only" mode to establish a clean 1-inch deep track. Once the carbide teeth are fully seated in the track, switch your SDS drill to "Hammer Drill" mode for rapid wall penetration.

• Hardware Maintenance: The extreme vibration of hammer drilling can loosen fasteners. Always use the included wrench to verify the side hex bolt is completely tight against the pilot drill before beginning a new hole.

7. FAQ: Expert Technical Support

Question: Can this 35mm masonry bit cut through reinforced concrete with rebar?

Answer: No. This tool is a percussion core bit designed for brick, block, and standard concrete. If the carbide teeth strike heavy steel rebar while in hammer mode, the teeth will shatter. For reinforced concrete with rebar, you must use a specialized diamond wet-core bit on a rotary-only setting.

Question: Why did my pilot drill snap when I started the hole?

Answer: Pilot drills usually snap due to "operator wobble" or applying too much force before the main carbide teeth have created a guiding track. Start slowly, keep the drill perfectly level, and let the tool do the work.

Question: Does this fit a standard household drill?

Answer: This kit comes with an SDS-Plus connecting rod, which requires an SDS rotary hammer drill. Standard household drills with 3-jaw chucks cannot grip an SDS shank properly and lack the necessary hammering power to drive a masonry core bit efficiently.