These RoHS-compliant, metric sized T-slot nuts are made of stainless steel, European Standard No. 1.4305 (American Standard 303 Series). They are offered in t-slot diameters from 8 to 18 mm and thread sizes from M6 to M16. T-slot nut blanks, untapped, are also available upon request.
J.W. Winco, 800/877-8351.