Rivet Nut vs Weld Nut vs Tapped Hole: Which to Specify
Rivet nut vs weld nut vs tapped hole: when each fastening method wins on thin sheet, coated surfaces, rear access and disassembly—with a decision table for designers and buyers.
Rivet Nut vs Weld Nut vs Tapped Hole
All three give you a female thread in sheet metal, but they suit different constraints. Choosing wrong adds cost, rework or a joint that fails in the field. Here is how to decide.
Rivet Nut (Blind Insert)
A rivet nut is pressed in from one side and clinches to form a thread. Strengths: no rear access, no heat, works on thin or coated sheet, won't burn off pre-painted or galvanised finishes, easy to spec in closed sections. Weaknesses: lower ultimate torque than a weld nut in the same gauge, needs the right grip range, and spin-out is possible in a smooth hole without a knurled body.
Weld Nut
A weld nut is resistance- or spot-welded to the panel. Strengths: very high torque and pull-out on bare steel, cheap per piece, fast on automated lines. Weaknesses: needs rear access for the weld head or a dedicated weld nut gun, burns off coatings (so not for pre-painted/galvanised surfaces without re-treatment), adds heat distortion, and is impractical on thin or aluminium sheet.
Tapped Hole (Threading the Base Material)
Tapping the panel itself. Strengths: no extra component, flush and cheap on thick enough material. Weaknesses: needs material thick enough to hold threads (roughly 2–3× the thread diameter), weakens thin sheet, creates chips, and is impossible in a closed section or on tubular/extruded profiles.
Decision Table
- Thin sheet (<2 mm) or tubing/closed section: rivet nut.
- Pre-painted, powder-coated or galvanised panel: rivet nut (welding burns the coating).
- Bare steel, high torque, automated line, rear access available: weld nut.
- Thick plate with rear access and no coating concerns: tapped hole or weld nut.
- Frequent disassembly / serviceability: rivet nut or tapped hole; avoid weld nut where thread wear matters.
Cost and Throughput Notes
Weld nuts are cheapest per piece but need welding equipment and coating rework. Rivet nuts add a component cost but need no heat and work on finished surfaces, which often saves the coating step. Tapped holes save a part but add chip management and material-thickness limits.
Frequently Asked Questions
Is a rivet nut as strong as a weld nut?
For bare steel at high torque, a weld nut is stronger. But a rivet nut wins where you cannot weld (coated, thin, closed sections) and is more than adequate for most panel-mounting loads when sized to the grip range.
Can I use rivet nuts on aluminium?
Yes—rivet nuts are a common fix for thin aluminium where tapping is weak and welding is difficult. Use the correct body material and a knurled body to resist spin.
Which is best for a pre-painted enclosure?
A rivet nut: it sets cold, so the paint film is untouched. A weld nut would burn the coating and need repair.
Do you supply rivet nut tools and inserts together?
Yes—TORCHMARK supplies both tools and inserts with OEM/ODM and mixed-MOQ; see the rivet nut tool manufacturer page or the buyer's guide.
