Screw size and type for the 87-138

A home owner from California says:
KELLER SLIDING WINDOW ROLLER, 5/16" FLAT WHEEL, do you happen to know the screw size and type that was specified for the Keller sliding windows that used the 87-138 roller?
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Dave Sr. from SWISCO responded:

Unfortunately, in Keller's manual, they don't specify the screw size, so we're not exactly sure what screw you will need for your window. I'm guessing it is either a #6 X 1" long or a #8 X 1" long screw. Look at the 33-010 or the 33-017. You will need to remove your screw and compare it. You could also take the screw to a hardware store in your area to have them match it up for you.

A home owner from California says:
Thanks for your guidance. I did check with my local hardware store and the old screw is an SS Pan Phillips Sheet Metal #6X1" screw, your 33-010. I will be placing my order with your company today.
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Dave Sr. from SWISCO responded:

Glad to hear it worked out. Let us know if you need any help placing an order. Good luck with the repair!

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