SWS-6-S NBK Seal washer - Rubber Packing Silicone rubber NBK Washers Pack of 10 Washers Made in JapanSWS 6 S NBK Seal washer Stainless Steel Pack of 10 Washers NBK Made in Japan Characteristics: SWS S uses silicone rubber for the rubber packing. Features outstanding heat and cold resistance and electrical insulation. Main body is made of stainless steel SUS304 Seal washer incorporating rubber packing in a stainless steel washer Prevents air liquid leakage from the seating surface of the screw head. During screw tightening, the rubber bonds with the