#4 Counterbore – Solid Carbide TiAln Coated


5 in stock



We had these counterbores custom made for us by one of the top tooling manufacturers here in the USA.

These are a solid pilot  TiAln coated solid micro grain carbide  counterbore. They are .195 X .109 and are built to work with our    4-40 socket head and short socket head screws.

These are tighter than a standard #4 counterbore and will leave a .005″ clearance around our .185″ screw heads for a clean precision fit and look…

TIP:  DO NOT clamp down the part you are counterboring. These do not like to flex . Hold your part free and you will get awesome results. We have counterbored hundreds of holes and are still using the very first one we ever bought!!!

Additional information

Weight 2 oz
Dimensions 4 × .5 × .5 in