25/64" Just go to Home Depot and ask for a 25/64" HSS drill bit 12" long. Kidding. Actually I like holes for carriage bolts to be tight. A 3/8" ship auger bit will give you the perfect hole. Wood won't hurt the threads.
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May 13, 2019 · PreDrill Countersink Bit. A pre-drill countersink bit makes a pilot hole for the screw and the conical countersink hole at the same time. This method easily gives you consistency as you move from screw to screw. I've used this set for years in countless projects! There are three different sizes and an adjustable collar so you can set the depth.
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Start with a very small drill bit and punch thru. Before drilling, make sure you have clearance under. Once you have your hole done, next step is important. Get the right size bit. Reverse the drill and drill downward till you get thru the gelcoat. Once that is done, drill thru. This helps keeping spider cracks forming. Rod holders.
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Dec 14, 2019 · The bit used to drill the hole for the production casing must fit inside the casing string above, see below Table. This, in turn, determines the minimum size of the second deepest casing string. With similar considerations, the drilling bit size and casing size of successively shallower oil/gas well segments are selected.
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CO-Z HSS 5PCS Titanium Step Drill Bit Set with Automatic Center Punch, 50 Sizes in 5 High Speed Steel Drill Bits Set for Sheet Metal with Aluminum Case, Multiple Hole Stepped Up Bits for DIY Lovers. 4.4 out of 5 stars 753. $26.99 $ 26. 99. 5% coupon applied at checkout Save 5% with coupon.
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Lo-Driv & Tri-Round Recommended Pilot Holes Sizes – Inch Screws: Material Thickness Inch Nominal Screw Size Diameter – TPI: Inch Approx.US Gauge Material.020 – .055 26 – 17 Diameter.061 – .122 16 – 11 Diameter.125 – .245 11 – 3 Diameter.250 – .312 3 – 5/16″ Diameter.313 – .500 5/16″ – 1/2″ Diameter: 4 – 40: Steel ...