Drilling through 18/8 70k psi fasteners

I need to safety wire some 18/8 70k psi fasteners. Are cobalt bits enough? Can I use manual application of cutting oil or will I need flooded coolant?

Any advise would be appreciated.

@soundman98 somehow I feel like you may the answer here

 

Do you have a milling machine?

 

They should drill fine but stainless likes to work harden don't let the drill bit turn in the hole without cutting or it will harden and break the drill bit or just not be drill able anymore. Cutting fluid can be useful but down let the part heat up. A drill press or better would be help alot with good and consistent feed

 

Sharp bits and plenty of flowing cutting fluid.

 

i work with stainless fasteners, but i don't believe anything my company supplies to me is that high quality/tensile strength...

all the comments so far are what i'd say. speed tends to be slow, keep it oiled, and if you've got lots of holes to make, it's better to go through extra bits than to try forcing the same bit through all of it.

i've generally been pretty happy with the store-bought milwaukee titanium bits. the blue color spyder bits tend to cut slightly better in metals, but are about double the cost, so always been a tough sell. i haven't tried a ton of cobalt bits, but the few i have cut only marginally better, but not enough to justify the additional cost premium for me.

most of it comes down to the cost/speed you want the project to go. higher end bits can make for faster drilling, but get obscene pretty quickly cost-wise.

 

$53 Speedway Motors Safety Wire Drill Fixture: Premium Aluminum for Accurate Bolt Head Drilling, Fits 3/16" to 5/8" Diameter Bolts, Comes with Hardened Bushings & 1/16" Steel Bits for Reliability

https://www.amazon.com/Speedway-Motors-Safety-Drill-Fixture/dp/B01N9VQTYH