- It is a type, which made an external diameter of a shaft slightly larger than that of WSPTF series.

- Containing the retainer part in a nut, it gives tidy appearance and high rigidity.
- As a circle flange type, it can be installed in a simple way.

- It is a type, which expanded safety working load by making the whole length of a nut longer than that of WSPF series.

- With a square flange part, it can be installed in a simple way.

- It is a type, which expanded safety working load by making the whole length of a nut longer than that of WSPF series.
GO

- A structure where balls in two ball rows touch Gothic arch groove of a nut and a shaft by four points.
- As a circle flange type, it can be installed in an easy way.