![]() The minimum required pilot hole size for an M10 coach screw with a 10mm thread diameter is 5mm when used with softwood and 7.5mm-8mm for hardwood. The required pilot hole size for an 8mm thread diameter M8 coach screw is 4mm when used with softwood and 6mm for hardwood. The recommended pilot hole size for an M6 coach screw is 3mm when used with softwood and 4.5mm-5mm for hardwood. These recommendations should be used as a guide for wood, but should be adapter for tougher materials accordingly. The recommended drill hole sizes vary depending on the type of material being drilled, such as wood, metal, or concrete. These recommendations are based on extensive testing conducted by experts in the field to ensure that the pilot holes. The chart below provides recommended diameters for pilot holes for coach screws. Please note that these recommendations are intended as a starting point and should be adjusted according to specific coach screw applications. ![]() Conversely, denser or harder materials may require a larger pilot hole diameter to accommodate the screw's threads without causing undue stress. ![]() While there is a standard guide of the required coach screw pilot hole size being half the thread diameter of the screw for softwood and three-quarters of the thread diameter when used with hardwood, it is important to consider factors such as the thickness and composition of the material and adjust your pilot hole accordingly.įor materials with low density or softness, a smaller pilot hole diameter may be sufficient to provide adequate grip and prevent splitting or damage. In this article, you will find detailed charts that show the minimum pilot hole size you should use before using your coach screw to ensure secure and efficient fastening. The purpose of drilling pilot holes is to create a guide for the screw, ensuring that it can be inserted easily and securely into the material without causing any damage or compromising its integrity. This article provides a comprehensive analysis of coach screw pilot hole sizes and guides you with selecting the appropriate pilot hole size for M6, M8, M10, and M12 coach screws DIN 571.
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