KPMBOLT super nuts, having undergone 100% full inspection, provide impact-resistant and long-term fastening solutions for shafts, frames, and bearings of cone, jaw, and hammer crushers.

The mining crushing industry serves as the core of raw material supply. Equipment such as cone crushers, jaw crushers, and hammer crushers operate under extreme conditions characterized by heavy dust, strong vibration, heavy impact, and continuous load. Key components, including main shafts, frames, bearing seats, and eccentric sleeves, are subjected to huge alternating stress and impact loads. Traditional nuts rely on friction and are prone to loosening under continuous impact, resulting in shaft deviation, bearing burnout, frame cracking, and abnormal movement, which lead to frequent downtime, high costs, and safety risks. German KPMBOLT Super NutsLeveraging nearly two centuries of fastening technology from JUNGEBLODT, these products adopt a multi – jackbolt structure and implement strict full – process quality control. They are specifically designed for extreme crushing conditions and have emerged as the most reliable fastening solution for… KPMBOLT is applicable to crusher shafts and frames.

KPMBOLT is composed of a nut body, jackbolts, and thrust washers, all of which are manufactured in accordance with the Manufacturing and Inspection Process Plan (MPP). The nut body is fabricated from high – strength alloy steel accompanied by a material certificate, belonging to the same batch and heat number. Its chemical composition is verified by a spectrometer, conforming to GB/T 3077. After being heat – treated to a hardness range of HRC 30–36, it undergoes 100% hardness testing. The grain size is ≥5 grade, and it is subjected to 100% ultrasonic testing (UT) in accordance with EN 10308 Level 4. The jackbolts are made of higher – grade steel, with a hardness of HRC 48–54, and 100% hardness testing is performed. The yield strength is ≥1500MPa, and 100% magnetic particle testing (MT) is carried out according to EN 10228 – 1 Level 4. The washers have a hardness of HRC 40–44, characterized by precision and defect – free. The pure axial preload ensures uniform force distribution and eliminates loosening.

KPMBOLT is widely employed in crusher shafts, frames, bearing seats, eccentric sleeves, and crushing chambers. With sizes ranging from M30 to M150, it can directly Replaces the original nuts and features easy installation. The failure rate is decreased by more than 90%, the operation duration is extended by 50%, and the cost is reduced by over 60%. Holding a Chinese patent and with fully traceable quality, KPMBOLT complies with the standards of mining equipment. With the progress of intelligent mining, KPMBOLT provides stable, safe, and economical fastening solutions for crushing equipment, enabling mines to reduce costs and enhance efficiency.

References:

[1] GB/T 3077;

[2] KPMBOLT MPP documents;

[3] JUNGEBLODT technical data;

[4] Mining Machinery.