Product Description Product Description Main Product: Carriage Bolt (A round head bolt with a square neck under the head and a unified thread pitch. Designed to keep the bolt from turning when a nut is being tightened. The short neck variety is used in sheet metal where a standard sized neck would create an obstruction. DIN, ANSI, JIS, BS standard, custom design products, coarse/fine thread are available upon your requirement. ) Size: Diameter: M5 to M20, 1/4" to 3/4" Length: 16 to 200mm, 1/4" to 6" Material: Low/medium carbon steel and stainless steel 201/304/316 are available Finish: Zinc, Black Oxide, Nickel, Dichromate Dip are available. Trademark: Huacheng Model: carriage bolt Standard: DIN, ANSI, JIS, BS standard, Productivity: 500TONS/MONTH Unit Price/Payment: FOB Shanghai