3 min to Know Everything About Vaccum Brazed Drill Bits: 2025 Shdiatool Diamond Hole Saw Guide

Vacuum brazed diamond drill bits have become one of the most efficient tools for drilling through hard materials such as tiles, porcelain, and natural stone. As a leading manufacturer, Shdiatool specializes in producing high-performance vacuum brazed drill bits, offering excellent durability, speed, and stability.
In this guide, we will explore the materials, manufacturing process, applications, RPM requirements, usage precautions, and common issues encountered when using diamond drill bits, especially on an angle grinder or electric drill.

1. Main Materials and Manufacturing Process

Materials

A typical Shdiatool vacuum brazed diamond drill bit is composed of:

• Drill Body / Steel Base

  • Large sizes without wax: 45# steel

  • Small sizes with wax filling: 40Cr steel

• Industrial Diamonds

• Cooling Wax (used in 18mm and below for heat dissipation)

Manufacturing Process

All Shdiatool diamond drill bits are produced using vacuum brazing technology, a process that firmly bonds the diamond grains to the steel body. This ensures:

• Higher diamond exposure

• Faster cutting speed

• Longer tool life compared to electroplated bits

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2. Suitable Material Applications

Vacuum brazed drill bits are designed primarily for:

✔ Recommended Materials

• Porcelain tiles

• Ceramic tiles

• Granite, marble, and other natural stone

✔ Optional (Not Recommended as Main Use)

• Concrete

• Glass

Drilling concrete is possible, but:

• Tool life may drop significantly (sometimes up to half, depending on concrete grade and thickness)

• Drill bits may clog more easily

3. Required RPM for Vacuum Brazed Drill Bits

To achieve optimal performance:

▶ Minimum RPM: 2500

Lower RPM will reduce efficiency and significantly shorten the lifespan.

Tool Comparison

• Angle Grinder:

  • Fast rotation speed

  • High efficiency

  • Better drilling quality

  • Longer lifespan

• Hand Drill:

  • Typically 2000–3000 RPM

  • Lower efficiency

  • Shorter lifespan

Straight-shank bits generally wear faster than threaded-shank bits under the same conditions.

4. Important Safety & Usage Instructions

1. Wear proper PPE: safety glasses, mask, hearing protection, gloves, and protective clothing.

2. Disconnect the power before installing or removing the drill bit.

3. Disable hammer mode on machines that have it. Use drilling mode only.

4. Perform a quick no-load test to check balance before drilling. Any noticeable imbalance means the bit should not be used.

5. Recommended RPM:

   • Angle Grinder

     • Under 100mm diameter: 6000 RPM recommended, max 11000 RPM

     • 100mm and above: 3000 RPM recommended, max 6000 RPM

   • Hand Drill

     • Use the tool at its maximum RPM

     • Must be a corded drill, not a cordless drill (insufficient power)

6. Start drilling at a 45° angle to create a crescent-shaped groove, then gradually move to 90° vertical drilling while gently rocking the tool.

7. Apply light pressure only. Excessive force causes overheating and reduces lifespan.

8. If the drill bit becomes clogged:

   • With no side debris holes:
     Use a wrench or tool to tap the side of the bit to vibrate debris out.

   • With a debris-extraction slot:
     Insert a screwdriver or long nail through the slot and tap with a hammer to push debris out from the top.

9. Do not touch the drill tip immediately after use—it can be extremely hot.

5. Common Problems & Solutions

1. Bit Clogging

• For 19mm and above:
  Insert a screwdriver / long nail through the chip-evacuation slot and tap with a hammer to remove blockages.

• For 19mm and below (wax-filled types):
  Tap the drill bit lightly on the side to shake debris out using vibration.
  Once the wax is fully consumed, the bit’s lifespan will be near the end.