What is a J Bolt?

Mary McMahon
Mary McMahon

A J bolt is a J-shaped bolt which can be used in a variety of applications. Many hardware and building suppliers stock J bolts, and it is also possible to order custom sizes directly from manufacturers of bolts and fastening products. These bolts can be made from several different metals, and subjected to various treatments, depending on how and where they will be utilized. It can be handy to keep a few around the house for various projects, in the case of people who do a lot of do-it-yourself work.

Man with a drill
Man with a drill

In a J bolt, the threading runs along the flat arm of the J. One could think of a J bolt as half a U bolt, since that is essentially what it is. The diameter of the bolt can be varied, as can the type of threading, and the angle and size of the hook at the base of the bolt. Manufacturers can also cater to specific requests in the case of larger orders. To attach something to a J bolt, threaded nuts and washers can be utilized as needed.

One common use of J bolts is as cast-in-place anchor bolts. Anchor bolts are used to affix various objects to concrete, and J bolts provide a great deal of support and stability, with the shape hooking the bolt in place so that it will not come loose. When J bolts are cast in place, they are inserted into concrete while it sets in a desired location, with the threading sticking out so that things can be bolted down. J bolts can also be inserted through drilled holes in metal and wood, with the loop of the bolt creating a very sturdy hook.

Steel is a common choice of metal for casting a J bolt, because steel is strong, durable, and resistant to many corrosives. It is also possible to use titanium and other metals for specific tasks, such as securing very heavy objects. Various treatments can be used to make the bolt resistant to specific corrosives so that it can be used in environments where these corrosives are present. A resistance to acids, for example, might be very useful at a chemical manufacturing plant.

These specialty bolts can often be purchased in bulk bins at hardware stores, with people selecting as many as they need from an open tray. They can also be ordered in large lots for construction projects. The price of individual bolts tends to be cheapest in lots, and ordering in lots is also often the only way to get specialized J bolts with features tailored to a specific job.

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a wiseGEEK researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

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Discussion Comments


What is the greasy, black and dirty rust inhibitor that is on the j-bolt?


How do you locate what the pull out strength would be for a 1/2" x 6" J Bolt?

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