What Is The Difference Between Press-fit Nuts And Pull-fit Nuts?

Compression nuts and pull nuts are very different in installation principle, operation method, application scenarios, performance characteristics, etc. Here's a closer look:
I. Installation Principles and Operation Methods
Pressing nuts:
Principle: Perpendicular pressure is applied using hydraulic press or riveting tool to embed embossed teeth at the base of the nut into pre-drilled holes of the plate. The surrounding material undergoes plastic deformation and flows into the guide groove, forming a mechanical lock.
How to operate:
It needs to be operated from one side of the plate, not the other.
Relying on the pressure control of riveter, the installation process is stable and stable.
Suitable for mass production and high efficiency.
For example: the interior plate is fixed to a sheet metal part of the car; multiple nuts can be quickly installed using a compactor.
Tightening nuts:
Principle: The rivet gun is used to exert tension, causing the tail of the nut to expand and clamp down on the plate to form a fixed connection.
How to operate:
It needs to be operated from both sides of the metal plate (the gun head inserts the nuts from the front and the tail expands from the back).
Depends on the dynamic pull of the rivet gun; the tool must remain perpendicular to the sheet metal during installation.
Suitable for field operations or space constraints; flexible.
For example, a bracket is mounted inside an enclosed pipe and secured from the inside with a rivet gun.
ii. Structural Characteristics and Appearance Differences
Pressing nuts
Structure:Characterized by embossed teeth or guide grooves at the bottom, usually a hexagonal or circular head with a smooth surface.
Appearance:After installation, the nut head is flat or slightly protruding from the surface of the plate, with no expansion structure on the back.
Advantages:Smooth finish for situations that require sealing or spraying.
Rivet Nut
Structures:Retractable cylinders at the tail, notched necklines at the inside, and mostly rounded or flat heads.
Appearance:After installation, nut head may bulge slightly, forming a bulge that locks the plate in place.
Advantages:Better adapted to plate thickness, suitable for thin plates or tubes.
III. Application Scenarios Comparison
Scene | Press-fit Nuts Applicability | Rivet Nuts Applicability
Sheet Material Type | Low-carbon steel, aluminum alloys, etc.. Good malleable material | Sheet, tube, stainless steel, etc.
Sheet Material Thickness | Typically 0.8mm-6mm (requires matching press-fit machine pressure) | 0.5mm-10mm (more adaptable)
Installation Environment | Factory production line (required to fixed tooling) | Field operations (e.g. outdoor, enclosed spaces)
Connection Strength | High (depending on mechanical connection of embossed teeth to plate) | Medium high (depending on the frictional force of tail expansion)
Sealing Requirements | Applicable (flat surface to be used with sealing gaskets) | Selection of sealing mode or additional sealing measures required
Vibration Environment | Anti-vibration measures (e.g., locking washers) are needed | Self-locking models or floating structures can improve anti-vibration
IV. INTRODUCTION Comparison of performance characteristics
Installation Efficiency | Pressurized nuts: Short installation cycle (approximately 1-3 seconds), suitable for automated production lines.
Rivet Nuts: Each cycle takes a little longer to install (about 3-5 seconds), but requires no fixed overalls and is flexible.
Cost Comparison
Pressed Rivet Nuts: High equipment costs (crushing nuts ranges from a few thousand dollars to tens of thousands of dollars per unit), but low nut unit prices.
Pulled Rivet Nuts: Low equipment costs (manual rivet guns cost only a few dozen dollars), but the nut unit price is slightly higher.
Vibration Resistance
Pressed Rivet Nuts: rely on the knurled teeth to engage sheet metal; they may become loose under vibration and require additional anti-loosening measures.
Pulled Rivet Nuts: tail expansion provides greater friction; some models,such as self-locking type, offer superior vibration resistance.
Reusability
Both are not reusable: after installation, the nut forms a permanent connection to the sheet metal; removal requires destructive operation.
V. How to Choose?
Pressing of rivet nuts:
Mass production requires efficient installation;
Thicker sheet metal (>3mm) with good material ductility;
High requirements for surface flatness (e.g. painting and sealing applications).
rivet nuts are best used in situations where field operation or space is limited (e.g., inside or outside pipes); thin plates (<1.5mm) or need to be adapted to different thickness; frequent position adjustments or temporary fixation is required.
VI. INTRODUCTION Typical cases
Pressure Mounting Nut:Wiper holder is fastened to the metal plate of the door by a pressure installer and can be quickly fitted with multiple M6 nuts.
Rivet nuts:The door hinges are rivet gun inside ventilation ducts and secured from the inside of the ventilation ducts without needing to be removed.