The Montreal, Quebec service center of Nitrex Metal Inc. in Canada has gained approval from Dupont for ONC(r) as an alternative technology to salt bath for case hardening thread winding machine components. ONC(r) is applied to simultaneously enhance the corrosion and wear resistance of steels, while leaving a deep black finish; for Dupont, however, the appearance has the added advantage of providing color contrast as the thread travels through the winding equipment, improving the chances of spotting obstructions. The approval means subcontractors supplying these components to Dupont are now authorized to use ONC(r).