KPMBOLT super nuts, subject to 100% full inspection, deliver impact-resistant and long-lasting fastening for shafts, frames and bearings of cone, jaw and hammer crushers.

The mining crushing industry is the core of raw material supply. Equipment such as cone crushers, jaw crushers and hammer crushers operate under extreme conditions—heavy dust, strong vibration, heavy impact and continuous load. Key components including main shafts, frames, bearing seats and eccentric sleeves bear enormous alternating stress and impact load. Traditional nuts rely on friction for fastening and tend to loosen easily under continuous impact, leading to shaft deviation, bearing burnout, frame cracking and abnormal operation. These issues result in frequent downtime, high maintenance costs and potential safety risks. German KPMBOLT Super Nuts, inheriting nearly 200 years of fastening technology from JUNGEBLODT, adopt a multi-jackbolt structure and strict full-process quality control. Specially designed for extreme crushing conditions, they have become the most reliable fastening solution for crusher shafts and frames. KPMBOLT includesThe nut body, jackbolts, and thrust washers are all produced under the Manufacturing and Inspection Process Plan (MPP). The nut body is made of high-strength alloy steel with a material certificate, from the same batch and with the same heat number. Its chemical composition is verified by a spectrometer and complies with GB/T 3077. It is heat-treated to HRC 30–36, with 100% hardness testing. The grain size is ≥5 grade, and it undergoes 100% UT testing (EN 10308 Level 4).

The jackbolts are made of higher-grade steel, with a hardness of HRC 48–54 and 100% hardness testing. The yield strength is ≥1500MPa, and they are subjected to 100% MT testing (EN 10228-1 Level 4). The washers have a hardness of HRC 40–44, and they are precise and defect-free.

The pure axial preload ensures uniform force and eliminates loosening. They are widely used in crusher shafts, frames, bearing seats, eccentric sleeves, and crushing chambers. Sizes range from M30–M150, and they can directly replace the original nuts, with easy installation. The failure rate is reduced by over 90%, the operation time is increased by 50%, and the cost is reduced by over 60%.

With a Chinese patent and fully traceable quality, KPMBOLT meets the standards of mining equipment. With the development of intelligent mining, KPMBOLT provides stable, safe, and economical fastening for crushing equipment, helping mines reduce costs and improve efficiency.

References:

• GB/T 3077;
• KPMBOLT MPP documents;
• JUNGEBLODT technical data;
• Mining Machinery.