The DIN 603 standard specifies the dimensions and materials for carriage bolts with round heads, square necks, and large wood threads. These bolts are commonly used in woodworking and construction applications where a smooth, low-profile finish is desired. The square neck prevents the bolt from turning as it is being tightened, making it ideal for use in hard-to-reach areas. The large wood threads provide excellent holding power in wood, making these bolts suitable for heavy-duty applications such as building construction and timber framing. DIN 603 carriage bolts are known for their reliability and durability, making them a popular choice for professionals and DIY enthusiasts alike.