Premier Instruments & Controls Ltd or Pricol offers Chain Tensioners. Premier Instruments & Controls Ltd is an ISO/ TS 16949, ISO 14001, OHSAS 18001 certified company. The Chain Tensioners are offered in Rack type with Movement of Plunger in steps, Screw & Torsion Spring type having continuous Plunger Movement, and Screw & Flat Spiral Spring type having continuous movement of Plunger.