Online Parts Store › Carriage Bolt, 3/8"-16 x 3" Image 1 of 1 Carriage Bolt, 3/8"-16 x 3" $28.53 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Oval Head, #12 x 1" $45.16 Stainless Fender Washer 3/8", .078" Thick, OD 1-1/2" $54.73 Flat Washer, #8, .032" Thick, OD 3/8" $5.42 Nylon Insert Locknut - Stainless 1/4-20 $27.84 Stainless Cotter Pin 1/16" x 3/4" $17.76