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1/2" x 1.375" OD Low Carbon Zinc Steel USS General Purpose Flat Washer QTY 100
A nice touch with National Supply Company is the pre-lubricated moving parts.
1/2" x 1.375" OD Low Carbon Zinc Steel USS General Purpose Flat Washer QTY 75
You will find that the thermostat assembly fits most standard industrial setups without any hassle.