Rivet Nut vs Weld Nut | Sherex by PEM Comparison Guide
Rivet Nut vs Weld Nut: Which Should You Specify?
The choice between a blind rivet nut and a weld nut is one of the most common specification decisions in sheet metal assembly. Both provide a load-bearing threaded attachment point in thin material, but they differ significantly in installation method, cost, quality, and flexibility. This guide from Sherex® by PEM® sets out the key differences to help engineers and procurement teams make an informed decision.
Installation Method
Weld nuts are resistance- or projection-welded directly to the sheet material, requiring welding equipment, operator skill, and safety controls. Heat generated during welding can cause distortion, hardness changes, and surface damage in the surrounding material.
Blind rivet nuts from Sherex by PEM are installed mechanically using a spin-pull tool, with no heat, sparks, or fumes. Installation is clean, fast, and can be performed by operators with minimal training. Rivet nuts can also be installed after painting or surface finishing, eliminating the need to mask or re-coat fastener areas.
Weld nuts are resistance-welded or projection-welded directly to the sheet material, requiring welding equipment, operator skill, and safety controls. Heat generated during welding can cause distortion, hardness changes, and surface damage in the surrounding material.
Blind rivet nuts from Sherex by PEM are installed mechanically using a spin-pull tool, with no heat, sparks, or fumes. Installation is clean, fast, and can be performed by operators with minimal training. Rivet nuts can also be installed after painting or surface finishing, eliminating the need to mask or re-coat fastener areas.
Total Installed Cost
Blind rivet nuts from Sherex® by PEM® can reduce total installed cost by up to 55% compared to weld nut processes when the full cost of welding — including equipment, consumables, energy, rework, and operator time — is taken into account. Rivet nut installation is typically faster per fastener, requires lower capital investment in tooling, and generates less scrap through distortion or mis-weld rejection.
Quality and Consistency
Weld nut quality is heavily dependent on operator skill, weld parameter consistency, and regular equipment maintenance. Variation in weld strength is a known quality risk, particularly in high-volume production environments.
Blind rivet nut installation using calibrated Sherex by PEM spin-pull tools delivers consistent, repeatable results on every cycle. Process monitoring tools such as the RIV943 enable 100% installation verification, providing a level of quality assurance that weld processes cannot easily match.
Flexibility and Applications
- Rivet nuts can be installed in finished parts — no masking or re-finishing required
- Single-sided installation enables use in closed or inaccessible sections
- No material distortion means rivet nuts are suitable for pre-formed, pre-painted, or decorative surfaces
- Weld nuts remain preferable in very high-temperature environments or where weld strength is specifically called out in a design standard
Summary: When to Choose a Rivet Nut
- When single-sided access is required
- When heat distortion or surface damage from welding is unacceptable
- When installation after painting or finishing is required
- When process consistency and 100% installation verification are production priorities
- When total installed cost reduction is a programme objective
➤ Contact the Sherex by PEM team to discuss transitioning from weld nuts to blind rivet nuts in your application.