Hex Flange Bolts Screws are made of alloy steel. Lakshman Tools Pvt. Ltd. Is the manufacturer of Hex Flange Bolts Screws. Lakshman Tools Pvt. Ltd., an ISO 9001:2000 certified company manufactures high tensile steel fasteners suitable for applications in all types of industries and automobile companies. The fastener products are sold under the brand name of " RHINO" .Strength Designation Class/Grade of Hex Flange Bolts Screw is 8.8, 10.9. This range of Bolt Screw are used in the manufacturing of engine frames and body frames.