The expansion Series split nut pre-bulbed is a type of fastener that combines the dual functions of riveting and expansion fixation, specifically designed for low-strength substrates such as plastics, composite materials, and thin metal plates. Its core features include: bidirectional expansion structure: During installation, the tail expansion body radially expands, forming a bidirectional clamping force to prevent the base material from cracking or deforming.
Core advantage
1. The super-strong thin plate adaptability can form stable threads on soft substrates such as plastic and fiberglass reinforced plastic ranging from 1 to 5mm, solving the problem of traditional rivet nuts being easily pulled through.
2. The anti-rotation design features a knurled or hexagonal structure on the outer wall to prevent loosening after installation, making it particularly suitable for vibrating environments (such as car interiors and drone bodies).
3. Some optional models are equipped with O-rings for sealing, achieving IP54 level or above dust and water resistance (such as outdoor electronic equipment enclosures).
4. The cold installation process without thermal damage avoids thermal deformation or material performance degradation caused by high welding temperatures.
5. The high-load-capacity expansion structure disperses stress, and the static load is 30% to 50% higher than that of ordinary rivet nuts.
Selection and Installation Guide
Substrate matching
Plastic/fiberglass reinforced plastic: Choose aluminum alloy or nylon expansion rivet nuts (to reduce expansion stress).
Metal sheet: Made of stainless steel or carbon steel to ensure full deformation of the expansion body.
Installation tool
Manual tools: Suitable for M4-M8 small specifications (such as GESIPA® FireFly).
Pneumatic tools: Recommended for mass production (pressure 4-6Bar).
Aperture control
Drilling must be carried out strictly in accordance with the specification sheet (usually 0.1 to 0.3mm larger than the outer diameter of the nut).
Notes
After installation, check whether the expansion body spreads evenly to avoid uneven loading.
The long-term service temperature of the nylon material is ≤120℃.
