Kelko Manufacturing, LLC dba Kelko Products Share: Manufacture Manufacturing Visit Website Request Info 2110 George St. Sandusky, OH 44870 (419) 626-2571 (800) 346-7883 (419) 626-3115 (fax) www.kelkoproducts.com About Map About We're a family owned business now operated by the third generation of the Koch Family. Together, the three brothers represent over 75 years of combined experience in the stud bolt business. What's Nearby? Distance: 5 10 15 20 25 50 mi.