Bhastrik Mechanical Labs Private Limited manufactures Edge Welded Diaphragm Bellows. Bhastrik Mechanical Labs Private Limited is an ISO 9001-2000 certified company. The Edge Welded Diaphragm Bellows are Nesting Ripple type edge welded bellows made out of stainless steel in AM350 and exotic metals including Hastealloy C-276 and Inconel 600, 625 or 718. The Diaphragm Bellows are available in sizes ranging from minimum of 12 mm I.D. To 175 mm O.D.