CRL HBT4 4" HBT Belgian Thread Electro-Formed Diamond Drill

CRL HBT4 4" HBT Belgian Thread Electro-Formed Diamond Drill

C.R. Laurence HBT4 4" HBT Series Belgian Thread Electro-Formed Diamond Drill is engineered for fast cutting and high production runs, making it an essential tool for glass professionals. This drill features an impressive 1/2" diamond matrix depth, ensuring extended work life and optimal performance in demanding applications. Its thin-walled design enables quick and efficient drilling, while the Belgian style mounting threads (1/2 - Gas) cater to both U.S. and European glass drilling machines. With an extra long shank measuring 1-3/8" by 3/8" (35 by 9.5 mm), the HBT4 provides a positive grip for enhanced control during operation. The precision nature of this drill requires it to be used in a stable machine setup-never under excessive pressure or for freehand drilling. For best results, consider using a dressing stone before each use to maintain the drill’s cutting capabilities. Safety is paramount when working with the HBT4; always wear appropriate gear and use a Ground Fault Circuit Interrupter when employing electric tools with water or coolant. This drill is designed specifically for flat plate glass drilling, ensuring reliability and precision in your projects.

4" HBT Series Belgian Thread Electro-Formed Diamond Drill

• For Fast Cutting, High Production Runs
• Extended Work Life
• 1/2" Diamond Matrix Depth
• Two Mounting Styles to Choose From: Straight Shank or Belgian Type
• HBT Feature Belgian Mount (1/2 - Gas)

These CRL Electro-Formed Diamond Drills are thin-walled, with a 1/2" (12.7 mm) deep multi-layer of diamonds and bonding matrix designed for high speed, high production drilling. These drills give outstanding results when exacting conditions are met. The CRL DCD Series features an extra long 1-3/8" by 3/8" (35 by 9.5 mm) diameter shank for a positive grip on the drill. The CRL HBT Series features Belgian style mounting threads, also known as 1/2" (12.7 mm, gas thread), which are popular choices for U.S. and European glass drilling machines.


Due to the fragile nature of these types of drills, they should be used in a precision machine, never allowing too much pressure to be applied. It is important to handle these types of diamond drills with care and use on flat surfaces only. Sharpening or "dressing" of these drills before each use will substantially increase their cutting capabilities. A dressing stone is a recommended necessity when working with an Electro-Formed Diamond Drill.

IMPORTANT NOTE: CRL DCD and HBT Series Diamond Drills have a very thin wall which makes them EXTREMELY FRAGILE. They are intended for the drilling of flat (plate) glass ONLY, in a true running, production type drilling press.

NEVER perform any type of freehand drilling. The use of a hand drill requieres a stabilization base such as a our GDB1 & GDB2 Glass Drilling Bases. Extreme care and caution should be used as the use of these drill in any other manner other than as specified may damage the bit and void warranty.

Always wear the proper safety gear including gloves and eye protection when drilling glass. Work should be performed on a flat, horizontal surface. A Ground Fault Circuit Interrupter must be used when using any type of electric tool in conjunction with water or coolant. Failure to follow any of these precautions can result in operator injury.