Prime‑Line carriage bolts provide strong, dependable fastening for wood‑to‑wood or wood‑to‑metal applications commonly found in home improvement and repair projects. Featuring a smooth, rounded head with a square neck, these bolts are designed to prevent turning during installation and deliver a clean, finished appearance on visible surfaces. Ideal for use in outdoor furniture, decks, fencing, gates, signage, and structural assemblies, Prime‑Line carriage bolts are intended for use with same‑size matching nuts and washers to ensure proper fit, improved load distribution, and a secure long‑lasting hold. Manufactured from quality materials for durability and corrosion resistance, they install easily with standard tools and perform reliably in both indoor and outdoor environments. Trusted by DIY homeowners and professionals across the U.S., Prime‑Line carriage bolts make it easy to complete projects with strength, stability, and a professional finish. Size: 3/8 inch-16 X 6 inch Features a smooth rounded head as opposed to a standard hex head Square shoulder allows for nut to be tightened or loosened Often used in cases where a protruding bolt head could cause injury Nuts and washers not included, ensure washers and nuts are same diameter Thread Type: Coarse, Thread Class: UNC-2A, Point Style: Blunt Specification(s) Met: ASME B18.5 and ASTM F593/1 UPC 049793132901 Brand PRIME-LINE Color Zinc Model 9063970 Set Name Pack of 10 Head Type Domed Size Name 3/8 in. -16 Metal Type Stainless Steel Unit Count 1.0 Count Item Weight 1.6 Pounds Part Number 9063970 Thread Size 3/8''-16 Thread Type Unc Drive System Square Finish Types Polished Grade Rating Grade A Manufacturer Prime-Line Thread Class Others Thread Style Right Hand Fastener Size 3/8 Fastener Type Carriage Bolt Item Diameter 0.38 Inches Item Hardness grade 18-8 Material Type Stainless Steel Item Type Name Carriage Bolt, 3/8 in-16 X 6 in, Stainless Steel, Pack of 10 Exterior Finish Stainless Steel Item Dimensions 6 x 4 x 4 inches Number Of Items 10 Thread Coverage Fully Threaded Number of Pieces 10 Screw Head Style Domed Screw Point Style Blunt Manufacturer Grade Grade 18 8 Included Components Carriage Bolt Compatible Groove Diameter 0.38 Inches Global Trade Identification Number 00049793132901