The biggest I have is 1/2 inch drill bit. I need to drill my oil pan for a -10an oil return line bulkhead fitting. I have to buy a new drill bit so I wanted to get the right size. Thanks

 

Don't drill the hole (or even buy the drill) until you have the fitting in your hand!

To say that the fitting is a number 10-an just says what size the inside diameter is and that it's for a #10 fitting. It doesn't say what size the outside diameter is and it could vary.

In addition; Maybe I'm unclear what you are doing but it would seem to me that you would want to braze in a "bung" at the oil pan (and then use an adapter to #10). That is unless there is a reason to have an internal pipe to direct the oil.

Wes

 

Use a hole saw or fly cutter. Or, use a small drill and drill many holes around the edge. A large diameter spiral drill will be a disaster in thin material. And, what the other guy said, don't drill until you have the part in hand, OR, have the mechanical drawing of the bulkhead fitting.

 

Thanks guys.

 

do not use a bulkhead fitting for an oil pan.
use either a -10 weld fitting or a 1/2" NPT to -10 fitting instead.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sgT &raquo;</TD></TR><TR><TD CLASS="quote">do not use a bulkhead fitting for an oil pan.
use either a -10 weld fitting or a 1/2" NPT to -10 fitting instead.
</TD></TR></TABLE>

Any reason why?

 

sticksin too far usually.