3/8 in Nominal Size
SYOZ20-3/8 is the 3/8 in nominal tool-shank variant for the SYOZ20 collet family.


Royce Ayr SYOZ20-3/8 is a 3/8 in precision SYOZ20 collet for securely clamping compatible round tool shanks in SYOZ20 / EOC12 toolholding systems. Royce states its collets conform to DIN 6388 and should be snapped into the nut before the nut is threaded onto the tool holder.
3/8 in nominal tool-shank collet for compatible SYOZ20 / EOC12 holders and nuts, with family identification dimensions of 34 mm OAL and 20 mm OD.
Compatible SYOZ20 / EOC12 toolholders and collet nuts. Verify the holder/nut family and nominal tool-shank size before installation.
The Royce Ayr SYOZ20-3/8 is a precision SYOZ20 collet sized for a 3/8 in round tool shank. It is intended for compatible CNC-router toolholders and collet nuts using the SYOZ20 / EOC12 system.
Royce states its collets conform to DIN 6388. The SYOZ20 family-identification envelope is 34 mm overall length and 20 mm outside diameter.
For installation, snap the collet into the nut first, then thread the nut onto the tool holder. Verify nominal shank size, clean mating surfaces, correct holder/nut family and proper tightening procedure before running the machine.
Technical Specifications
SYOZ20-3/8 is the 3/8 in nominal tool-shank variant for the SYOZ20 collet family.
The SYOZ20 family envelope is 34 mm OAL by 20 mm OD, supporting positive collet-family identification.
Royce specifies snapping the collet into the nut before threading the nut onto the tool holder.
Use only with compatible SYOZ20 / EOC12 toolholders and collet nuts. Confirm the nominal 3/8 in tool-shank size before clamping. Keep the collet, nut and holder mating surfaces clean; snap the collet into the nut before threading the nut onto the holder; and do not mix collet families that may appear visually similar.
Royce Ayr SYOZ20-3/8 combines a 3/8 in nominal tool-shank size with the verified SYOZ20 family envelope and DIN 6388 toolholding standard.
Correct holder-family matching, clean seating, proper nut assembly and appropriate tightening are essential to concentric clamping and reliable CNC-router tool retention.