Z axis lead screw size

Anyone know the lead screw size for z axis . My coupler won’t tighten anymore and gotta find the right size .

1/4" x 1/4" or 25mm x 25 mm. Check it with micrometer or veneer caliper. I think some newer model may have a larger screw size, but the motor is 25mm. Maybe Daniel from Langmuir could chime in ?

Ya I think I seen a few of your feeds . Did you ever get couplers ?

Rutland couplers CLX 4-4-F Zoro com. Has them in stock. They will fix your problem for good. That’s the ones I use. Lead screws have never slipped again. Just helped someone else yesterday. Amazon has them but I understand they are out of stock.

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