casement swing arm

A contractor from Langhorne, PA says:
Before I order, please confirm which part I should order. two identifiable numbers are on two separate pieces of this part that I need to replace. one piece has 20810 and another piece has 30841L. It is either your part number 39-155 or your 39-031. Please confirm which one to order.

Mike, Regal Construction Mgnt.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
The 39-031 operator was used by various window manufactures. It has a 4-1/2" link arm with the clip on it. The 39-155 was used mainly by "Cardco" windows. It has a 3-13/16" link arm with the clip on it with #20755 stamped on it. Sorry I can not ID your numbers. Go onto each product page to get a better look. You can also post pictures of your hardware if you would like us to try to identify which replacement operator you need.
A quick learner says:
Dave, the long arm measures 9 1/2" does that help? When looking at the window from the interior, the locks are on the left and it pivots from the right.
- Mike
Profile picture of Mike
Mike from SWISCO responded:
Dave's original reply used the term "long", but we have since changed it to "link".
A quick learner says:
If you may, Is anyone there able to zero in on the part I am looking for? The glide rail did have Thermal Gard stamped on it.
- Mike L.
Profile picture of Mike
Mike from SWISCO responded:
We would be happy to research this for you if you cannot identify the needed hardware on our site. Please post some pictures of your hardware in a reply to this discussion thread.
A quick learner says:
The glide rail has "Thermal Gard" stamped on it. The Long arm measures 9.5", the small piece closest to the interior, and has a curve to it, has a stamp (30841L), the piece connected to that one and then to the sash has a stamp also (20810).
User photo of their Thermal Gard glide rail.
Profile picture of Donna
Donna from SWISCO responded:
Does the link arm measure 4-1/2" or 3-13/16"?
A quick learner says:
I do not wish to make another trip to the job, to measure again. It would be embarrassing.If the stamped numbers don't answer that question then I will take a guess and say 4-1/2"
Profile picture of Donna
Donna from SWISCO responded:
That is embarrassing, I wish I could tell from the photo exactly what one to choose, the 39-031 and 39-032 operators with the 4-1/2" link arm are more popular so that is a good choice when you are not sure of the size.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at 856-317-6263 or at help@swisco.com.