Online Parts Store › Carriage Bolt, 3/8"-16 x 3-1/2" Image 1 of 1 Carriage Bolt, 3/8"-16 x 3-1/2" $36.78 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Stainless Fender Washer 5/8", .109" Thick, OD 2" $37.03 Phillips Tapping Screw - Pan Head, #10 x 1-1/4" $32.56 Phillips Tapping Screws - Oval Head, #12 x 1-1/2" $30.55 Lag Screw, 3/8 x 1-1/2" $63.91 Nylon Insert Locknut - Stainless 7/16-14 $21.10