How it connects
The flat crown wraps one face and the legs straddle the member. Nuts on the threaded legs draw a backing plate or bracket toward the crown to grip the member; nut position adjusts the opening. No fluid seal is involved.
Male and female halves
The clamped-member interface has no conventional male/female designation. Separately, the two externally threaded legs are male and mate with matching internally threaded nuts.
Usually connects to
- Square or rectangular tubing
- Flat-sided structural members
- Backing plate or mounting bracket with two matching holes
Common sizes
- No universal envelope series. Specify inside width, inside leg length, thread length, rod diameter and corner radius. The supplied item record describes a 3/8 in x 3 in x 7 in example; these are not universal mating dimensions.
Where it is used
Rectangular tube mountingMachinery framesTrailersAgricultural equipmentFabricated supports
Variations
- Different inside widths and leg lengths
- Metric or Unified inch threaded legs
- Carbon steel or stainless steel
- Plain, zinc-plated or hot-dip-galvanized finishes
How to recognise it
Look for a flat crown, two approximately right-angle bends with finite corner radii, parallel legs with threaded ends, and often a two-hole backing plate plus nuts. Verify inside width/depth, corner clearance, plate hole spacing and thread specification rather than relying on appearance.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Round-bend pipe U-bolt | A round-bend U-bolt has a curved crown for round stock; the square-bend type has a flat crown and two corner bends for flat-sided members. This is an open, adjustable clamping enclosure with threaded legs and nuts, not a bore with a pipe-mating thread or seal. |
Also called
Square U-bolt clampSquare-bend U-boltRectangular-tube U-bolt
Good to know
The 76.2 mm clear width and 144.875 mm opening height describe one configuration rather than a mating standard. Confirm the leg pitch.
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