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We dont install too many 5th wheel hitches but when we do, my guys gripe about the bits. Is there a really good 1/2" bit out there or just keep using the mid priced ones and going throught them.

Yes, they have tried cutting oil, pilot holes and all the other tricks.

Thanks.
 

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http://hougen.com/cutters/sheetmetal/16000.html

Annular cutters for a standard drill chuck. Comes in 1/2" flavor. Going to be near $70 for that single bit. It'll get the job done.

For a 1/2" hole I would start with a size just larger than the web on the 1/2" bit. Use a split point for the pilot hole. Steady pressure and a good speed (I'd guess I'm around 1000rpm for pilot holes in metal), you should be getting ribbons with a sharp bit. Then move to the 1/2" bit, standard chisel tip will work fine. Slower speed (< 500rpm), and more pressure. I can never get ribbons with larger bits and hand drilling. But you should be getting decent sized chips, not fine particles. I use oil mostly for keeping the bit cool. I use the 40:1 dilution that the machine shop at work uses.
 

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standard HSS American made machinist quality bits work best for me in mild steel.

for stainless steel, we use the house brand black and gold bits from Fastenal.

i get all of my other drills, taps, end mills, etc from www.wttool.com.

the biggest thing is keeping the RPM's low and the pressure high. watch the chips coming off the drill bit. if they are coming off with any kind of color (hand drilling), there is too much friction. slow down and more pressure.
 

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standard HSS American made machinist quality bits work best for me in mild steel.

the biggest thing is keeping the RPM's low and the pressure high. watch the chips coming off the drill bit. if they are coming off with any kind of color (hand drilling), there is too much friction. slow down and more pressure.
Exactly what I was going to say.
 

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Harbor Freight unibits, no oil, top speed, and an assload of pressure, rips right through, don't last especially long, but they're on sale for $4 every other week, just add $10 to whatever you charge your customers and it's all good.
 

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The HF step drills are surprisingly good. I bought 3 sets last year when they were on sale for $8.88, figured they would dull and burn up quick. Still on my first set and I have used them quite a bit. Usually "on sale" for around $10.
ITEM 91616
Drill accessories Screw Tool accessory Brass Screw extractor
 
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