Galvanized Anchor Bolt Designs

There are many different designs for anchor bolts, including headed, straight, and bent. They can include nuts and/or plates on the embedment end. They can also be swedged.

Bent Anchor Bolts

  

A right-angle bend anchor bolt is a commonly used design, especially in smaller, “standard” sizes. The bent portion, or “leg,” of the anchor bolt provides resistance, preventing the bolt from pulling out of the concrete when force is applied. Most bent anchor bolts are specified by their inside dimensions, as the drawing above demonstrates, although some engineers may specify outside or centerline dimensions. Galvanized bent anchor bolts are readily available in the marketplace as a stock item in diameters ranging from 1/2″ through 1″. Larger sizes are typically made to order.

Thread-Each-End Anchor Rods

Straight anchor bolts, also referred to as “anchor rods”,  are typically designed with thread on each end. To provide resistance so the rod does not pull out of the concrete, a nut is added on the embedded end and sometimes a bearing plate will be used. This is especially common in larger diameters. Galvanized anchor rods are typically not a stock item in the marketplace and are custom manufactured to your specifications.

Headed Anchor Bolts

Headed anchor bolts are steel fasteners with a forged hex head, heavy hex head, or square head on one end. The head is embedded in concrete to provide secure anchorage, while the opposite end is threaded to accept a nut and washer for attaching structural steel or equipment.

These bolts are commonly specified in construction applications such as light poles, sign structures, steel columns, and heavy machinery. The forged head offers superior pull-out resistance compared to straight rods, making headed anchor bolts a preferred choice when strength and reliability are critical.

Headed anchor bolts are manufactured to meet ASTM specifications (such as F1554 Grades 36, 55, and 105) and are available in plain finish, hot-dip galvanized, or other protective coatings for long-term durability.

Swedged Anchor Rods

  

Swedged anchor rods are typically used in bridge design for bridge bearings. The indentations provide resistance in the concrete to keep the rod from pulling out. The indentations must be formed not cut, and the pattern can vary from one state’s Department of Transportation to another.

All-thread Anchor Rods

All thread rod is commonly used with epoxy in existing concrete foundations. The only common grade of galvanized all thread that is readily available in the marketplace is A307. Other grades will need to be cut to length or made from scratch and galvanized to order. Portland Bolt stocks all thread rod in the following grades that can be cut to length and galvanized quickly: F1554 Grades 36, 55, and 105, A307, A449, A354 Grade BC, and A193 Grade B7.

Custom Galvanized Anchor Bolts from Portland Bolt

Galvanized anchor bolts are available in many different configurations to suit a wide range of construction applications. Engineers select the proper grade, size, and design of each galvanized anchor bolt based on project requirements and the forces it must withstand. At Portland Bolt, the specialized processes involved in producing these fasteners are part of our comprehensive manufacturing capabilities, ensuring consistency, strength, and long-term performance. These galvanized anchor bolt designs, along with many other products, are available through Portland Bolt.