1/4-20 x 1-1/2" Carriage Bolts, 304 (18/8) Stainless Steel Carriage Screws, Round Domed Head Square Neck, Grade A2-70, Full Thread, Coarse Thread UNC, 25-Pack

Thread Size: 1/4-20; Screw Length: 1.5""; Package Contents: 25 pieces. Diameter of the head: 0.59"" (15mm,max); Height of the round head: 0.145"" (3.68mm,max); Height of the Neck: 0.156"" (3.96mm,max). Material: Crafted from high-grade 304 stainless steel (18-8) for exceptional strength and corrosion resistance—naturally durable without coatings. Outlasts regular steel and zinc-plated fasteners in harsh environments like moisture, chemicals, or extreme temperatures. Design feature: Big round domed head designed to eliminate the need for a washer; Square neck underneath the head helps self locking; Their strong holding power ensures the stability and reliability of your contructions; Use wrench or plier tools to turn the square neck to install them. Ideal for demanding outdoor/industrial applications—from agricultural machinery and bridge decking to marine fixtures—these carriage bolts deliver permanent anti-rotation security and zero-maintenance integrity in corrosive environments