Round-bend, square-bend, and long-tangent U-bolts for pipe, conduit, structural support, and equipment clamping. Carbon, alloy, 304, 316, hot-dip galvanized — stocked deep, bent in-house when stock won't fit.
A U-bolt is the simplest custom part on the truck — round bar, threaded both ends, bent into a U. The simplicity is the trick: change the diameter, the inside dimension, the bend radius, the leg length, or the profile, and you have a different part number every time.
We stock the most common round-bend and square-bend sizes, and we bend the rest in-house from B7, A36, 304, and 316 stock. Send the pipe size and the application; we'll come back with a part to print.Beam clamps and girder clamps are a different family — see Lindapter Hollo-Bolt.
The standard catalog runs round-bend over square-bend, plus the long-tangent variant the hangers keep specifying.
The default profile — semicircular bend that wraps a round pipe with no point loads. Pipe support, conduit, automotive exhaust, suspension.
Two 90° bends — for clamping square tube, channel, structural sections, and U-channel framing. Spec by inside dimensions, not pipe size.
Round bend with extended thread length on the legs — for stacked saddles, multiple plates, insulated pipe, or where a longer reach is needed.
U-bolts get drawn five different ways depending on the trade. We need the same five measurements either way — give us these and we can pull stock or quote a bend.
Most U-bolts ship in mild-carbon A36 round bar with rolled or cut threads. When the spec needs more — strength, corrosion, or temperature — we work in the same grades we run for studs and rod.
Mild and quenched-and-tempered carbon steel for general support, automotive, and machinery.
The default U-bolt material — soft enough to bend cold without cracking, strong enough for the bulk of pipe support and clamping work. Plain, electro-zinc, or hot-dip galvanized.
Low-carbon steel for general bolting service — moderate-load, moderate-temperature clamping. A307-B for pressure piping support and structural hangers.
Heat-treated U-bolts in SAE J429 Grade 5 and Grade 8 for higher-load, dynamic, or vibration-prone clamping — automotive suspension, leaf-spring, equipment mounts.
304 and 316 austenitic for chemical, food, marine, and outdoor architectural service. The default in coastal, sanitary, and process pipe support.
304 stainless U-bolts for outdoor, food, and pharma pipe support. Bends cleanly cold; threads roll well; passivated finish.
316 stainless for chloride-bearing service — coastal, marine, chemical, pulp & paper, wastewater. The default upgrade when 304 surface-rusts.
Stainless to A193 when the project requires the pressure-piping standard — even on a U-bolt. B8 for general stainless service; B8M for chloride and acid resistance.
Alloy U-bolts for hot-pipe support and process plant pipe-rack hardware. Less common but spec'd by name on refinery, power, and chemical work.
Chromium-molybdenum alloy U-bolts for hot pipe support and process pipe-rack clamping. Strong, but less ductile — bends are done at controlled temperature with post-bend stress relief.
Low-temp alloy U-bolts for cold-side process — LNG, ammonia, refrigerated piping. Same chemistry as B7 with a Charpy impact requirement.
Plenty of jobs end up needing a made-to-print U-bolt — odd pipe size, structural section that won't take a stock bend, exotic material, or a profile we've never seen. That's our day job.
A photo of the drawing on a clipboard, a DXF, a hand sketch with the five dimensions. Anything we can read into a CNC bender, we can run.
Z-bends, offset legs, asymmetric square bends, swedged legs, threaded inserts. We've made U-bolts with one welded foot and one nut — if it solves the joint, we'll quote it.
U-bolts ship with whatever they pair with — formed saddles, hot-rolled plate clips, UV-resistant cushion liners, matched heavy hex or nylon-insert lock nuts.
Most U-bolts live outdoors, in a roof-rack, or in a process-pipe environment. Pick the right finish up front — re-coating after install is rarely an option.
U-bolts solve “wrap a fastener around something.” If your project needs a different attachment method, start here instead.
D, A, L, T, R — material, finish, quantity. A bolt specialist will come back with a quote, usually inside 24 hours. Or just send a sketch on the back of a napkin.
From a stock 1″ NPS 304 round-bend to a 1500-piece run of HDG square-bends with bonded saddle plates — we've shipped the package before.