Because they are used with wood, carriage bolts are rarely high strength and virtually always supplied in a standard ASTM A307 specification. Carriage bolts have a smooth, rounded head for a finished look. Types of bolts and their uses. Understanding A Carriage Bolt. Carriage bolts usually have a larger head diameter compared to hex head bolts. The main difference between the regular version and carriage bolts consists of the domed head that is twice the … The hole should be just slightly smaller than the bolt's diameter. A carriage bolt has a square shoulder under a rounded head which resists turning when the nut is tightened or removed. The frame and rails are just two examples. Normal use of a carriage bolt, is to provide an extremely strong positive fastener, that has a finished industrial appearance ( the domed head ), for use with heavy duty framing or even rough furniture work. I would use at least 1/4 inch bolts, with a washer underneath the nuts !! Carriage bolts are very misunderstood and yet very simple to install. Carriage bolts are different from the normal screws because of their unique feature, a domed head. They are commonly used in ready-to-assemble furniture. Click on a Carriage Bolt type above to continue shopping… Carriage Bolts. The carriage bolt is then inserted into the hole and secured with the washer and nut. Elevator bolt: Image credit: TOPS Inc. A flat, plain or countersunk head with a squared undercut holds the bolt in place when a nut is tightened. The answer is simple. If you are using a 1/2″ diameter bolt use a 1/2″ drill bit. Most of our inventory is available in both type 18-8 and 316 stainless steel bolts. Top 5 Best Home Uses For Carriage Bolts What Is A Carriage Bolt? Carriage bolts are a type of hexagon bolt specialised for use in woodworking, in particular, fastening metal to wood. eye bolt: An eye bolt is a bolt with a looped head. The square neck under the round head will seat into the hole in the wood to prevent the head from turning. 950 products. These classifications all play a role in the final selection of a bolt type for a certain … Carriage bolts are used to fasten metal to wood. Elevator bolts are designed to be used for leveling appliances or furniture. Carriage bolts can be used with wood, metal, or concrete to build strong structures such as wooden decks. The greater surface area of the washer used with a machine bolt provides more holding power than you get with a carriage bolt. Installing A Carriage Bolt. Carriage bolts are designed with a domed head, which can prevent loosening from one side, an enlarged head shape also prevents the bolt from being pulled through a wooden construction. Galvanized Carriage Bolt (25-Pack) Carriage bolts have a smooth rounded head Carriage bolts have a smooth rounded head with a square neck underneath that locks into wood when tightened. Made primarily for wood, carriage bolts have a square shoulder right below the head. Spax and FastenMaster are available at home centers and hardware stores. They may be used in the construction of docks, swing sets and decks as well as other surfaces where a smooth finish is needed. A carriage bolt (also called coach bolt and round-head square-neck bolt is a form of bolt used to fasten metal to metal or metal to wood. Type 18-8 are standard grade, while 316 is a superior type often referred to as marine-grade steel. Explore our vast range of hexagon screws and hex bolts online at Bolt Base. Carriage Bolts have a round head and square neck that prevents the bolt from turning when the nut is tightened. Use with a pre-drilled hole and secure with … An elevator bolt is a similar to a carriage bolt, except the head (or foot, depending on the application) is thin and flat. About half the strength of medium-strength bolts, these bolts … This makes them ideal for a variety of uses. Through-bolts are stronger and should be used where possible. 1. Docks: There are plenty of areas on a dock that will require the use of a carriage bolt. Designed for use with a spanner, hex bolts are more suited for high-precision, heavy-duty fastening applications. Shown here are the three major brands of structural screws. Carriage bolts are used in wood or metal construction applications where the square neck grips into the part being fixed preventing the head from turning. Hexagons Bolts. Use the same size drill bit as the diameter of the bolt. In fact, I recently built a picnic table and used carriage bolts to join the legs to the table’s frame. Bolts are classified into different types according to their distinct head shapes, strengths, finishes and materials. Uses of carriage bolts. Ideal in salt water and chlorine environments. These are usually made from low carbon steel raw materials and they have a round head with a flat bearing surface. AFT Fasteners provides a helpful resource on carriage bolts including: carriage bolts sizes charts, specifications on galvanized carriage bolts, grads 5 & 8 carriage bolts, and stainless steel, plus material, hardness, strength and thread length. The undercut of the bolt head is square to hold the bolt in place once tightened. Brandon Dow July 10, 2014 at 4:39 pm. Thanks for writing, and good luck!–Joe T. Reply. Plow Bolts Similar to carriage bolts but used for attaching the cutting edge of a plow to the plow blade. Carriage bolts are ideal for use in wood-to-wood applications. The carriage bolt can be obtained in various diameters and lengths. Discover our wide range which features carriage bolts, coach screws, hexagon head bolts, hex set screws and more! The most common stainless steel for general hardware use. They are a member of the round head bolt family and commonly have a "circular head with a low rounded top surface and flat bearing surface, and an integrally formed square neck under the head." The knurled neck grips the inside of the hole to keep these bolts from turning when tightening a nut. Carriage heads are large smooth and domed with no drive. Carriage bolts (round head with a square neck) are commonly used in wood connections. Zinc plated steel. Standard carriage bolt (square neck, round head): Grade 2, 5, 8 (grade 8 carriage bolts are also known as shaker screen bolts), stainless steel (18-8 and 316 series), brass, silicon bronze, aluminum, exotic materials, and titanium; Ribbed neck carriage bolts (ribs under the head) in 18-8, grade 2 and grade 5. They’re zinc-plated steel for corrosion resistance in wet environments.. For technical drawings and 3-D models, click on a part number. Styles include: Round Head Square Neck, Round Head Short Neck, Round Head Ribbed Neck, Fin Neck, and Flat Head Square Neck. LBNL, when using carriage bolts, make sure the hole you drill is not oversize for the specific bolt ! The carriage bolt is a threaded fastener that is typically employed in wood applications, although some specialized versions can also be utilized to fasten metal components. A carriage bolt is a bolt with threading all the way up the shank to a small square shoulder, with a domed head. High-strength structural screws are beginning to displace traditional lag screws as the fastener of choice for structural applications. For guardrails, use machine bolts with washers. It is distinguished from other bolts by its shallow mushroom head and the fact that the cross-section of the shank, though circular for most of its length (as in other kinds of bolt), is square immediately beneath the head. I use them all the time. Carriage bolts are commonly used because of their ease of use, especially when dealing with wood. Their smooth, dome-shaped heads offer an aesthetic appeal and some amount of safety when used in building wooden decking, decorative … Place large washers under the heads of lags and at both ends of through-bolts. You can also use … For the heaviest connections on a deck, such as where ledgers attach to the house or to posts, use 1/2-inch bolts or lags. They are not designed to be screwed into the surface and the square shape underneath the domed head prevents the bolt from turning once set into position. Wood Frames. Square ID hole washers are used on square neck carriage bolts and square shafts. When attaching wooden components together with carriage bolts, standard practice is to clamp the pieces together prior to drilling the hole for the bolt. When using carriage bolts, they must be countersunk to perform as they're supposed to. Carriage Bolts Sort & Filter Search Feedback Carriage Bolts. A carriage bolt has a square shoulder under a rounded head which resists turning when the nut is tightened or removed. Designed for use with square-neck bolts such as carriage bolts, these washers have teeth that dig into wood and other soft material to prevent rotation. Carriage bolts are used to fasten wood to wood, wood to metal and metal to metal. They are good for wood-to-wood connections when the head may not be accessible for tightening. Low-Strength Steel Knurled-Neck Carriage Bolts. Carriage bolts differ from regular screws as they have a domed head. Lastly, there is a Fin neck carriage bolt. Hi Linda, Glad you liked the tip on using carriage bolts. Bolts belong to the family of threaded fasteners and are paired with a threaded nut when in use, usually to join two or more components together. Carriage bolts are also known as coach bolts or round head square neck bolts. Abbrevi-ated HHMB or HXBT. This ensures that the structure being built is sturdy and robust. Re tighten bolts and lags after the first year and check periodically for tightness. If you do use hex head bolts, I would make sure there are washers underneath the heads. They are good for wood-to-wood connections when the head may not be accessible for tightening. A corrosion resistant steel alloy. You can use these bolts with thin plywood. The “History of the Nut and Bolt Industry in America” by W.R. Wilbur in 1905 acknowledges that the first machine for making bolts and screws was made by Besson in France in 1568, who later introduced a screw-cutting gauge or plate to be used on lathes. Bolts with a wood thread and There are many variations. [2] Carriage bolts are mostly used in wood to wood fastening and general construction of decks, porches, swing sets and other home auxiliary units. A highly corrosion resistant grade of stainless steel. Stainless steel 18-8. Stainless steel 316. It comes with a square shoulder and round head which can resist turning when the fastener is being tightened or removed. Carriage bolt: Image credit: Bolts 'n Nuts Plus. Krysta S. Doerfler Q: Building codes refer to the National Design Specification as the technical resource for capacities of various parts and pieces. Bolts with a smooth rounded head that has a small square section underneath. Carriage bolts. They may be used in the construction of docks, swing sets and decks as well as other surfaces where a smooth finish is needed. Here's how they compare. Secure it with a washer and nut. Carriage bolt washers feature square holes that allow for a fairly tight fit, as opposed to a round hole that would need to be much larger to slip over the corners of the square parts with which they’re assembled. 1/2 in.-13 x 8 in. A carriage bolt comes with a domed head and a square shank that protrudes from its flat side. Once it's drilled, use a hammer to drive the bolt through both pieces. 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