Rivet Nuts for Square Tubes and Closed Sections

Rivet Nuts for Square Tubes and Closed Sections

Square tubes, round tubes and closed profiles are everywhere in racks, shelving, doors, displays and equipment frames—and their interiors are unreachable from the back. Rivet nuts solve exactly this: single-sided installation that creates a reliable internal thread. We supply rivet nuts across common sizes to make closed-section joining dependable.

The nut is pulled from the front, collapsing and bulging on the blind side into a clamping anchor—no back access needed, ideal for enclosed cavities and odd profiles.

The Single-Sided Advantage

Closed profiles rule out weld nuts and conventional clinch nuts—clinch needs back-side forming force, welding needs back access. Rivet nuts install from the front, solving internal threads in enclosed cavities, boxes and frames.

The installed nut forms a clamping collar inside the wall, resisting pull-out and rotation with stable strength. Versus welding: no heat distortion, no spatter, no damage to the profile finish.

Common Sizes and Head Styles

Common threads cover M4, M5, M6, M8, M10 and popular imperial sizes; heads come flat, countersunk and reduced-flange. Flat is general-purpose, countersunk suits flush surfaces, reduced-flange fits tight spaces.

Body profiles are smooth, vertical-grip and hex—smooth for softer tubes, grip and hex for harder materials with better anti-rotation. Match body type to tube material and wall thickness.

Material Selection

Carbon steel rivet nuts are heat-treated for strength on steel tubes; stainless 304/316 serve outdoor, humid and corrosive sites, 316 resisting chlorides best. Aluminum and brass variants suit lightweight or conductive joints.

Match nut and tube materials to avoid galvanic corrosion—stainless tubes with stainless nuts, aluminum tubes with aluminum or stainless as environment dictates.

Installation Points

Confirm wall thickness falls in the grip range, drill and deburr pilot holes, and match the tool nosepiece to the nut body. Pull stroke and pressure follow product instructions to avoid under- or over-setting.

Volume work uses pneumatic or electric tools at fixed parameters with sampled pull and rotation checks. Installed nuts seat flush, do not rotate, and accept bolts cleanly.

Supply and Delivery

We provide spec lists and samples per project, bulk or tray delivery for field work, stock on common sizes, and custom production to drawing for special specs with delivery and packaging per plan.

Selection advice and installation guidance support crews in mastering the process quickly, cutting rework and making closed-section joining reliable.

Common Issues and Selection Tips

Common field issues with rivet nuts in tubes are rotation, under-setting and wall deformation. Rotation usually means oversized holes or wrong body type—switch to grip or hex bodies and recheck holes; under-setting often follows wall thickness beyond the grip range or short pull stroke; wall deformation points to burrs or excessive pull pressure.

For selection, share tube material, wall thickness and joint loading; we recommend size and body type, then validate installation in sampling to avoid rework at volume.