SWS-10 NBK Seal washer - Rubber Packing Silicone rubber NBK Washers Pack of 5 Washers Made in JapanSWS 10 NBK Seal washer Stainless Steel Pack of 5 Washers NBK Made in Japan Characteristics: 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 screw thread to make the seal rather than slipping out of place. Test results for JIS C 0920 protection degree IPX7 are available. The rubber does not escape even when the