Our High Carbon Steel Drill & Tap Kit for 8mm Screws is used to create internal threading of stainless steel newel posts and railing. A tap cuts threads on the inside of a hole, to accept a 5mm machine screw or bolt. These drill and tap combination produce a very strong and reliable thread.
- Includes: (1) drill bit and (1) 8mm tap
- Thread: 8mm - 1.25mm Plug Tap
- Drill Point: Cobalt -135° Split
- Tap Material: High Speed Steel
- HSS drill bits ensure fast, precise drilling
- High carbon steel plug taps are ideal for general purpose threading
- Mark holes.
- Secure the workpiece firmly.
- Drill the hole to the correct diameter and depth.
- Apply an appropriate lubricant such as oil, WD-40.
- Hold the tap in line with the hole and turn it clockwise. Try to keep it very straight as you turn, this is important. You may feel the material breaking.
- Every few turns, back the tap out (counterclockwise/anticlockwise) to clear away chips of loose material.
- When the tap has reached the required depth, back it out, clean out chips and any cutting fluid or lubricant, and try your screw or bolt in it.
- Tapping operations create chips. Mask or cover any parts of your workpiece or surroundings that would be damaged by chips, or plan to clean them off when you are done.
- Small taps are extremely easy to snap. It takes about 4 pounds of force to break a 5mm-8mm tap, so be very careful using small taps.
- For very thin material, it may be better to use a nut on the other side. Other options include press-in nuts designed for sheet metal and threaded inserts for softer materials, such as plastics. A good rule of thumb for metals is that at least three full threads should be in the material.
- Take care not to change the angle of the tap, especially at the beginning. You only want to cut one thread.
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