Stainless steel slit type flexible coupling TLK1 TLK2 TLK7 series Slit type flexible coupling TLK1 series includes set screw type ( parallel ) and setscrew type (spiral). Body material could be made of aluminum alloy or stainless steel. Parallel type shaft coupling keeps following features: 1. one-piece metallic spring coupling;2. little torque shaft connect; 3. zero backlash; 4. absorption of parallel, angular misalignments and shaft end-play by spring action;