The main distinction is between push-in, press-fit and weld-in square threaded inserts. Push-in styles are common for furniture, equipment feet and light-duty frames because they install quickly without secondary fastening. Press-fit and weld-in options are usually considered when the joint will see higher load, repeated adjustment or side force.
Material choice also matters. Plastic-bodied inserts can protect painted tube ends and reduce scratching on visible assemblies, while metal-bodied inserts are better suited to tougher mechanical fastening requirements. If the insert carries a leveling foot or caster, confirm how the load transfers into the tube rather than judging the part by the thread alone.
Start with the tube, not the bolt. Confirm the outside tube size, internal opening, wall thickness, corner radius and whether the tube is welded, drawn or formed with size variation. Square inserts usually rely on edge contact inside the tube, so a small mismatch can turn a firm installation into a loose fit or an assembly problem.
Match the thread to the part being installed. Leveling feet, glide feet and casters may use different thread forms or lengths even when they look similar. Check thread diameter, pitch, usable thread depth and whether the mating screw needs room to pass through the insert without bottoming out.
Think about installation conditions. A shop that wants fast assembly may prefer a push-in insert, while a welded frame or high-load base may justify a more permanent style. Avoid specifying an insert that requires force the tube cannot tolerate, especially on thin-wall sections or finished surfaces that must remain clean.
For an inquiry, prepare a simple drawing or sample details: tube size and wall thickness, required internal thread, expected load or application, finish requirements and installation preference. If asking Hebei Wotu Fastener Manufacturing Co., Ltd. about supply, confirm available insert styles, materials, thread options and any minimum order or sample policy before finalizing the design.
