Sigma Scientific Glass Pvt. Ltd offers Couplings with Stainless Steel Flanges. Sigma Scientific Glass Pvt. Ltd is an ISO 9001:2000 certified company. Couplings with Stainless Steel Flanges are made of set of SS 304 flanges, inserts with SS 304 nuts and bolts. The insert used in couplings can be of neoprene rubber or asbestos with SS 304 split ring as mentioned in the table. These Couplings with Stainless Steel Flanges are used in chemical, pharmaceutical, dyes and allied industries.