U-Bolts: Types, Sizes and How to Choose
U-bolts clamp pipes, axles and structural members, and they are one of the most practical fasteners in hardware. But the wrong size, thread or material can lead to a loose joint. This guide explains U-bolt types, sizes and how to choose.
What Is a U-Bolt?
A U-bolt is a U-shaped bolt with threaded legs at both ends, closed by a plate and two nuts. It wraps around a pipe, tube or beam and clamps it to a support.
Types of U-Bolts
Round U-bolt: for round pipes and tubes.
Square U-bolt: for square beams and rectangular sections.
Axle U-bolt: for vehicle axles and leaf springs.
Threaded U-bolt: with a long thread for adjustable clamping.
How U-Bolt Size Is Measured
U-bolt size is measured by the inside width, the inside length and the thread size. The inside width must match the pipe or beam diameter, and the thread must match the nut and the plate.
How to Choose a U-Bolt
Measure the pipe or beam diameter and choose the matching inside width.
Choose the thread size and length for the load and plate thickness.
Select galvanized or stainless steel for outdoor and wet areas.
Use a saddle or plate that spreads the clamping load.
FAQ
What is a U-bolt used for?
It clamps pipes, axles and beams to a support or structure.
How do I measure a U-bolt?
Measure the inside width, inside length and thread size. The inside width is the most important dimension for a correct fit.
Related Reading
U-Bolts and Fasteners
SolidLink supplies U-bolts and fasteners in galvanized and stainless steel. Browse our U-bolts or contact us for a quote.
