Tap drill size

- C
- Christopher Tidy
  
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posted
2 years ago

Fri, Jul 10, 2020 10:43 PM

Hi folks,
Can anyone tell me the correct drill size for use with this tap?

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I am guessing 7/16" or very close, but does anyone know for sure?
Thanks!
Chris

- J
- James Waldby
  
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posted
2 years ago

Fri, Jul 10, 2020 11:09 PM

In metric the tap would be 11.9 x .794 mm; charts like at show 11.25 mm drill for 12 x 0.75, and taking off 0.1 mm would give 11.15, which is 0.0015 over 7/16". The metric calculator at gives 11.20 for a 12 x 0.8 mm thread at 77% thread.

- J
- Jim Wilkins
  
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posted
2 years ago

Sat, Jul 11, 2020 10:23 AM

Hi folks, Can anyone tell me the correct drill size for use with this tap?

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I am guessing 7/16" or very close, but does anyone know for sure? Thanks! Chris ================================== This gives 80% thread for a 7/16" hole.

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jsw

- C
- Christopher Tidy
  
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posted
2 years ago

Sun, Jul 12, 2020 1:03 PM

Great. Thanks for the answers!
Chris

- J
- Jim Wilkins
  
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posted
2 years ago

Sun, Jul 12, 2020 9:27 PM

Great. Thanks for the answers!
Chris
=================
15/32-32 is the US standard for toggle switches. 1/4-32, 5/16-32 and 3/8-32 are also electronic thread standards. I used a 3/8-32 tap to make a heatsink that screws onto the F connector on a USB TV tuner that ran hot. 5/16-32 fits a Schrader tire valve, loosely.

- C
- Christopher Tidy
  
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posted
2 years ago

Mon, Jul 13, 2020 10:16 AM

A toggle switch is exactly what I want the tap for. The problem is that the plate is 10 mm thick, so there isn't enough axial length for the retaining nut and washer.
By the way, what size is the Schrader valve thread officially?
Thanks!
Chris

- J
- Jim Wilkins
  
  Contact options for registered users
posted
2 years ago

Mon, Jul 13, 2020 5:26 PM

A toggle switch is exactly what I want the tap for. The problem is that the plate is 10 mm thick, so there isn't enough axial length for the retaining nut and washer.
By the way, what size is the Schrader valve thread officially?
Thanks!
Chris ===================

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I've also seen 0.302" / 7.7mm specified.
The "Leica" thread is a mix of metric diameter and British pitch and form.

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Strangely, the rim + tire on a Soviet artillery piece captured in Iraq that I saw at an air show was sized in inches. The tire was Russian, made in Moscow (Mockba).

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