Casement window cranks

Question

I have casement windows, circa 1982-84, that have cranks that have failed. I need both left and rights.  From what I have found, US patent number 4.241.541  1982 and on the short arm is etched number 31538. Long arm is approx 9 1/2" and short arm approx 3 1/2" to swivel then 4"

Jasmine · Accepted Answer

Thanks for posting! Your operator looks pretty similar in design to the 39-031 EntryGard Dual Arm Operator (the opposite handed version is part 39-032).

These operators are compatible with the 39-107 Truth Hardware Cover along with the 39-114L non-folding or 39-205 folding crank handles; another replacement option is the 39-107FK , which is a folding crank and cover kit.

Take a look over the dimension below and compare them to your existing operator to see if this would work as a suitable replacement for your operator.

Dimensions for 39-031