Mykeal here's what I got from Track of the Wolf as an example of sizes... I wonder if they may also offer taps for the sizes below... you have a valid point.
RNA-05 Oversize nipple, 1/4-32 thread .005" oversize, for Numrich, for #11 cap, Ampco bronze
RNA-10 Oversize nipple, 1/4-32 thread .010" oversize, for Numrich, for #11 cap, Ampco bronze
RNA-20 Oversize nipple, 1/4-32 thread .020" oversize, for Numrich, for #11 cap, Ampco bronze
RNA-25 Oversize nipple, 1/4-32 thread .025" oversize, for Numrich, for #11 cap, Ampco bronze
SG
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