Pilot Hole Size Sheet Metal Screws

Size 6 7 64 inches.

Pilot hole size sheet metal screws.

No of auger bit. A size 4 screw should have a pilot hole drill size of 3 32 inches. There is nothing more aggravating when you just don t know what size drill bit to use for a pilot. Lo driv tri round recommended pilot holes sizes metric screws.

Aluminum sheet and bar including aluminum andzinc die castings and all alloys in rockwell b hardnessrange from 40 70 and other ductile materials of similar hardness such as brass bronze etc note special materials and applications may warrant special hole sizes. Types ab b self tapping screws in mild steel brass aluminium alloy stainless steel and monel sheet metal. Bit or drill sizes. To achieve this the right bit size should be used.

Size 8 1 8 inches. Size 10 9 64 inches. The problem was i didn t know how big to drill the holes and when the holes were too small it was quite difficult to. To help my readers out i thought i would add this quick reference chart.

Twist bit nearest size in fractions of an inch. It is recommended that you should spend ample time to read and understand the drill bit guide. Pilot hole sizes for metal screws and wood screws posted 30 january 2010 at 9 43pm by michael chu filed under. This should help whenever you run into a situation you need to drill a pilot hole and are not sure the size bit.

Drill gauge no to be used for. Shop for wood screws. The best way to drill an accurate pilot hole is to have the right hole size. For shank clearance holes.

Drill gauge no or letter to be used for maximum holding power. Twist bit nearest size in fractions of an inch. Average rockwell b 55 75. Your pilot hole drill bit size will depend on the size of your sheet metal screw.

Size 12 5 32 inches. It is important that the correct hole size is used and the recommendation below should be followed but if very hard material is being used a hole size slightly larger may have to be used and in very soft material a smaller hole. The pilot hole should be well fitted to the screw or the nail so that it would not wobble when inserted. Size 14 1 4 inches 3 16 inches.

Low carbon sheet and bar. However there are times when sheet metal screws are required.