Portland Bolt manufactures custom closed eye bolts from1⁄2" - 11⁄2" diameter to virtually anyASTM specification. Also referred to as "turned" eye bolts, they are often welded closed. Eye bolts are provided either plain finish or hot-dip galvanized. Stainless steel eye bolts are also manufactured. All operations, including thegalvanizing processandwelding, are performed in-house.