Stamp Options

A handy person from 91354, CA says:
I have a SWISCO balance Series 380 with a stamp b 15-1. What option do I need?
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Donna from SWISCO responded:
Looking at the stamp as 15-1 it could be 1510 option but looking at it as b 15 it could be 1520.

Weigh the actual window sash.

1510 will carry a window sash load of 4 through 6 pounds,
a 1520 will carry a weigh range of 6 through 10 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
A quick learner says:
I have a balance spring with a stamp of 1520y the y looks to be up side down. what do i need?
Profile picture of Donna
Donna from SWISCO responded:
Most likely the 1520, to check remove the window sash and place it on a scale.

A 1520 will carry a window sash weight range of 6 through 10 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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