Wholesale Price T-Shaped Head Unistrut Fittings - Hot DIP Galvanized Metal Stamping Parts

We do a full in-house destructive test on every 500 pieces or so—pull testing the T-head weld to about 1,000 N minimum, and the batch never fails below that threshold.

Most buyers don't ask for the third-party retest, but our company offer it anyway at cost if you want an independent lab to verify the zinc coating thickness, which averages 65 microns on the hot-dip batch I shipped last week; we just had one recheck come back within tolerance (HPLC used for the coating analysis, actually, though it's rare for unistrut fittings). ISO cert covers our whole stamping line, but teh COA we issue lists the actual tensile break point for each lot number—midnight shift on our press doesn't use a different material, it's the same medium carbon steel coil, specifcation roughly 5mm to 7mm thick depending on the order, and we store it indoors so no mill scale tampers with the weld quailty.

One thing we've noticed is the small batch runs sometimes have a scratch or two on the zinc surface before packing—doesn't affect structural support at all, just the looks, but if you're labeling for retail those would get sorted out.

We keep a 50-piece quarterly archive from every FIFO bin, so if your QC flags a bad fit six months later, our company can pull that same lot for re-test under a third-party agreement (usually 2-4 weeks for results); it's pretty much the only way to trace a small failure back to the coil date or the die wear, and in my experience those claims are rare—maybe 3 out of 400 orders last year.

Anyway, the T-shaped head design works fine in most strut channels up to 8-gauge thickness, but it's not really made for heavy-bent 16-gauge stud tracks—there the grip loosens at about 150 Nm, which we note on the SDS but not on the standard drawing.