The pilot hole recommendationsin the chart are typical for softwoods. Hardwoods may well need a slightly larger pilot hole. If the screw starts to get too tight, then it’s advisable to back out and re-drill a larger pilot hole rather than risk breaking a screw (you’ll be having a ve...
9Wood Inc. | 1BIntroduction: 1 [SCREW WITHDRAWAL STRENGTH IN 9WOOD’S ASSEMBLIES] July 2009 • Pilot holes should be at least 85% (and no larger than 90%) of the root diameter of the screw. In the case of threaded metal connectors, manufacturers recommend that pilot hole diameter be...
PILOT SECTION (WHEN NECESSARY) FLUTE POINT POINT The point is designed to efficiently remove material and precisely size the hole for the thread. FINISH: Platings and coatings provide lubricity during drilling and tapping as well as corrosion resistance. FASTENER DESCRIPTION AND BREAKDOWN EXAMPLE 10 ...