You can see a rough diagram here Where the 4"x4"s and the 2"x6"s come together (identified by the arrows in the drawing), I'm planning on using 1/2" carriage bolts, two for each direction. Carriage Bolt Standard Weight Chart. However, you need to be concerned about the size of the pilot hole. Alternatively, carriage bolts can also be used to fasten two pieces of wood together. These extremely sturdy fasteners are usually used to connect heavy lumber or other heavy materials that are bearing an intense load. Slotted carriage bolts are unique in that the head can still be held in place during fastening if there isn’t a square hole to lock bolt into place. In wood, tightening the nut pulls the shoulders of the square seat down into the wood and prevents the bolt from turning as you tighten. What are some good Christmas gifts for child woodworkers? ROUND HEAD SQUARE NECK CARRIAGE BOLTS WITH SQUARE NUTS. The nails will fill the gaps between the hole and bolt to keep it from spinning. It is always smooth and round, which means that it is not possible to utilize a drilling device in order to screw it into the material. Slotted. When you tighten the bolt, the neck gets pushed into this opening. They’re zinc-plated steel for corrosion resistance in wet environments.. For technical drawings and 3-D models, click on a part number. 18-8 Stainless Steel Carriage Bolts . A carriage bolt comes with a domed head and a square shank that protrudes from its flat side. LENGTH. The goal is to get the underside of the head of the carriage bolt to sit snugly against the material. This type has “fins” under the head instead of the square or hexagonal “neck”. Use with a pre-drilled hole and secure with a hex nut and washer to prevent spinning. The company serves Hex Bolt, Hex Nut, High Tensile Fastener, Threaded Rod, Spring Washer and many other types of products that are used in a number of applications Being an ISO Certified Company they provide doorstep delivery and after sale support to their customers. So, your plans call for 3 carriage bolts to hold the top planks to a frame. hex cap screw hex bolt Therefore, you cannot use them to screw into a surface of an object because there is a square shape just below the domed head that will prevent the bolt from tightening once it’s in … Also, the rounded heads of carriage bolts have a finished look and they can be put on the visible surface of a project. You will then need to attach your washer and your nut. They are good for wood-to-wood connections when the head may not be accessible for tightening. They do not have chamfer angle tapers to accommodate wood screws. Would you like to learn more about all types of power and hand tools? Standards for bolt strength grades are set according to a system devised by the Society of Automotive Engineers; this marking system uses raised dashes on the bolt head to indicate strength. Applications Put the center of this hole at the center mark of the large hole. This type of bolt does not have a nut. 1/2 in.-13 x 8 in. No problem. Set the depth of this hole to be the desired depth of the rounded head. Carriage bolts make this process quick and easy. The carriage bolt is then inserted into the hole and secured with the washer and nut. Types of Bolts and Their Uses Head Shapes. Tighten the nut to move the carriage bolt into its rightful place. 1. Steel Carriage Bolts The most common material used in fasteners, this material is predominantly iron mixed with carbon. If this happens, the joint will be weak. APPROXIMATE WEIGHT IN KGS FOR 100 NOS. When you’re finished, you’ll be able to put the carriage bolt into the counterbore you’ve just made. 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