spline size on the 39-414 operator

Contractor from Walnut Creek, CA
Oct 6, 2023 10:25 am
I need to put a longer handle on the newly installed 39-414 vent operator to clear the screen. What is the spline size?
4 Replies

Dave Sr. from SWISCO
Oct 9, 2023 1:50 pm


Hello, thank you for posting,
Checking the spline on the 39-414 operator, I found that it is 1/4" in diameter. However I did try the mobile home operator handle 39-116 with the 5/16" diameter and it worked fine once I installed the set screw in the handle. Let us know if you have any additional questions.

Contractor from Walnut Creek, CA
Oct 29, 2023 11:53 am
I went ahead and ordered the 39-116 crank handle (before I got this answer!) and from my measurements it seemed pretty close to the spline on the 39-414 vent operator. The only problem I had is that the supplied 1" long handle screw is too long and won't tighten completely. I was able to source a socket-head 8-32 x .75" screw that fits perfectly.

Dave Sr. from SWISCO
Oct 30, 2023 8:00 am


We appreciate the feedback and happy that we could assist with your repair. Please let us know if you have any future hardware questions!
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