Wire gauge drill bits

[6ply]

The big tidy up continues. I rediscovered this set of wire gauge drill bits. Never used them. Never likely to either. I drill and tap holes for metric and BSF/bsw fittings on a regular basis. What would these drills be used for? USA thing? Thanks.

 

[brightspark]

i have a set of number drills why arent you going to use them they all have a metric equivalent . there used a lot in model engineering

 

[6ply]

i have a set of number drills why arent you going to use them they all have a metric equivalent . there used a lot in model engineering

I have lots of drills. Probably too many. I've not met a need for these, but maybe I am missing something?

 

[MetalMonkey]

I have lots of drills. Probably too many. I've not met a need for these, but maybe I am missing something?

Number and letter drills just fill the "in-between" inch sizes - handy if you ever want to drill and tap UNF/UNC threads.

 

[Agroshield]

What would these drills be used for?

Use the number 8 as a tpping drill for M6 threads.

Once there are 59 more post following this, you will have a full set.

 

[Seadog]

Doesn't the number drill series go to 80?

 

[Seadog]

I doubt it. They're fine enough by the time you get to 60.

 

[JEZGUZ]

Having a nose through the Dormer twist drill and reamer handbook the No 80 drill is 0.0135" or 0.343mm, however it states at the bottom of the page " Gauge and letter sizes are no longer recommended British Standard drill sizes. Every effort should be made to use the alternative Metric or fractional sizes shown in our catalogue". There's no date of printing apart from Edition 476 but I'll guess '70's.

 

[6ply]

Use the number 8 as a tpping drill for M6 threads.

Once there are 59 more post following this, you will have a full set.

I keep drills for tapping with their matching taps and dies. Already got far too many!

 

[500e]

For sale ?

 

[brightspark]

Having a nose through the Dormer twist drill and reamer handbook the No 80 drill is 0.0135" or 0.343mm, however it states at the bottom of the page " Gauge and letter sizes are no longer recommended British Standard drill sizes. Every effort should be made to use the alternative Metric or fractional sizes shown in our catalogue". There's no date of printing apart from Edition 476 but I'll guess '70's.

well they will say that there in business to shift gear