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Requirement Details: I am looking to purchase Flat Section Steel Spring Washers, they are to be used under the heads of 1/4 inch car engine oil sump retaining bolts so do not need to be massively thick. I would require 1000 pieces per order. Size are as follows Outside diameter.575 inch (+or-.015inch on OD) Inside washer hole diameter is .257 inch (to take a 1/4inch UNC bolt). General thickness of my current washers is .077 inch (this does not including the split area which is obviously thicker) Preferred finish is Zinc and yellow if possible. Please send e-mail quote. Many thanks, Tony Broster