* The length of the spiral groove (ℓ) will be one half of the overall length (), regardless of the N dimension.
Recommended mold temperature for the usage of a precision leader pin and bushing is 80°C or less because of a little clearance between them. ( Click here)
A center hole may be left on one or both ends.
Oil groove part might not be colored by heat treatment. Despite appearance differences, it can be used without any problem.