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Step 1: Determine the Type of U Bolts Determine the type of U bolt you require before you begin measuring. U-bolts are available in a variety of shapes, including round, square, semi-round, and bespoke shapes. Determine the thread type as well, which could be coarse or fine. Knowing the exact type and thread of the U-bolt will help you identify the perfect replacement or size for a new application. Step 2: Measure the Diameter of U Bolts The most critical dimension to measure in a U-bolt is its diameter. 1. Gather the necessary tools A caliper or measuring tape is required to measure the diameter of a U-bolt. 2. Identify the measurement points Examine the U-bolt and find the spots on the inside of each leg where it forms a complete circle. These locations are typically located at the broadest point of the U-bolt. 3. Place the caliper or measuring tape Open the jaws of your caliper and place one jaw on the inside of one leg at the stated measurement point and the other jaw on the inside of the opposite leg at the matching measurement point. Close the caliper gently until it fits securely without distorting the U-bolt. Wrap a measuring tape around the inside of the legs at the stated measurement spots if you’re using one.