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ER20A collet nut has an internal thread of M25 x 1.5. 2. Outside diameter is 1.33" (34mm). 3. ER20A collet nut holds all ER16 collets.
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What size is ER16 mini nut?
ER16 Mini Nut is slotted with smaller profile compared to standard ER16 slotted nuts. The outer diameter is 22mm compared to 29mm on the standard nut. The thread is also different than the standard nut (M19 x 1.00 vs M21 x 1.50). Outer diameter is 22mm.