Drilling hardened metal made easy 
Drilling hardened metal
We believe that drilling hardened metal does not have to be difficult. Our aim is to supply the best drill bits for metal. At TTP HARD drills Limited we specialise in supplying cobalt drill bits and drilling lubricant paste for the drilling of harder metals and alloys. Our cobalt drill bits are sold worldwide to both companies and individuals. We offer both metric and imperial sizes. Drill bits can be bought in individual sizes or in handy sets. Our website is constantly evolving as we continue to add information helpful to those needing to drill metal. So weather you are new to drilling metal or a seasoned professional we are sure you will be happy with our products.
Drill bit sizes
TTP HARD drill bits offer both metric and imperial sizes therefore increasing drilling size options.
Metric drill bits
Individual metric sizes
1mm to 6.8mm are available in packs of 10 drill bits.
7mm to 13mm drill bits are sold singly.
Metric drill bit sets
19 piece cobalt drill bit set (1mm to 10mm x 0.5mm)
25 piece cobalt drill bit set (1mm to 13mm x 0.5mm)
Imperial drill bits
Individual sizes
1/16″ to 1/4″ are available in packs of 10 drill bits.
17/64″ to 1/2″ drill bits are sold singly.
Imperial drill bit sets
21 piece cobalt drill bit set (1/16″ to 3/8″ x 1/64″)
29 piece cobalt drill bit set (1/16″ to 1/2″ x 1/64″)
Hard drill bits for drilling stainless steel
Testing for hardness
In order to determine the hardness of our cobalt drill bits we commissioned SGS testing to conduct a Hardness check to BS EN ISO 6508-1:2016 using the Vickers testing method.
We were delighted to achieve an average hardness of 66 on the Rockwell scale.
You can watch the video of the hardness test being carried out.
