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Glow Plug Conversions

by Bill Wiggill
(South Africa)

What is the standard size tap I need to ream a hole for a short reach plug?

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Glow Plug Conversions

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Jul 21, 2008
 1/4-32
by: Pete

Hi Bill, a standard plug has a 1/4-32 gauge thread. There is a tap available, you can see one here.

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