CRL HBT312 3-1/2" HBT Belgian Thread Electro-Formed Diamond Drill

CRL HBT312 3-1/2" HBT Belgian Thread Electro-Formed Diamond Drill

C.R. Laurence HBT312 3-1/2" HBT Series Belgian Thread Electro-Formed Diamond Drill is engineered for precision and efficiency, making it an ideal choice for high production runs. Its thin-walled design, featuring a 1/2" (12.7 mm) deep multi-layer of diamonds, ensures fast and effective cutting on flat glass surfaces. The drill's robust construction provides an extended work life, allowing you to tackle demanding projects with confidence. This drill offers two mounting styles: a straight shank or a Belgian type, catering to various glass drilling machines popular in both the U.S. and Europe. The 1-3/8" by 3/8" (35 by 9.5 mm) diameter shank guarantees a secure grip, enhancing control during operation. Due to its fragile nature, the HBT312 should only be used in a precision drilling machine, avoiding excessive pressure that could compromise its integrity. For optimal performance, regular sharpening or "dressing" with a dressing stone is essential. Always prioritize safety by wearing gloves and eye protection while adhering to best practices in a controlled environment. Note that the HBT312 is intended exclusively for flat plate glass drilling and should never be used for freehand drilling. Ensure you follow all safety precautions to maintain both your safety and the drill’s longevity.

3-1/2" HBT Series Belgian Thread Electro-Formed Diamond Drill

• For Fast Cutting, High Production Runs
• Extended Work Life
• Two Mounting Styles to Choose from Straight Shank or Belgian Type

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.