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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 ER20 collet nut?
How do you install an ER collet?

ER Collets and Nuts - Mounting Instructions

1
Put the collet into the nut, turn the collet slightly, put it into the nut at the offered direction evenly. ...
2
Fix the nut, and the collet on the spindle rotates the nut until the collet is in press.
What size is an er25 collet?
ER Collet
Length
Clamping Range
ER-16
27.5 mm (1.08")
0.5—9 mm (0.020—0.354")
ER-20
31.5 mm (1.24")
1—13 mm (0.039—0.512")
ER-25
34 mm (1.34")
1—16 mm (0.039—0.630")
ER-32
40 mm (1.57"
1—21 mm (0.039—0.827")
What does er stand for in collets?
The standard series are: ER-8, ER-11, ER-16, ER-20, ER-25, ER-32, ER-40, and ER-50. The "ER" name came from an existing "E" collet (which were a letter series of names) which Rego-Fix modified and appended "R" for "Rego-Fix". The series number is the opening diameter of the tapered receptacle, in millimetres.