Online Parts Store › Carriage Bolt, 3/8"-16 x 4" Image 1 of 1 Carriage Bolt, 3/8"-16 x 4" $37.85 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, #4, .032" Thick, OD 5/16" $6.74 Phillips Tapping Screw - Pan Head, #14 x 1-1/4" $33.19 Phillips Tapping Screws - Flat Head, #8 x 3/8" $11.90 Stainless Cotter Pin 1/16" x 1/2" $9.76 Stainless Cotter Pin 5/32" x 1-1/4" $33.25