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 Phillips Tapping Screws - Oval Head, #10 x 2" $27.33 Stainless External Tooth Lock Washer 5/16" $19.48 Stainless Fender Washer 1/4", .062" Thick ,OD 1" $39.24 Phillips Tapping Screw - Pan Head, #12 x 1-1/2" $30.92 Phillips Tapping Screws - Flat Head, #8 x 5/8" $12.41