A 5th-generation German family business with 170+ years of fastening expertise, KPMBOLT upholds Quality First as our unwavering core. We integrate time-honored craftsmanship with advanced manufacturing, delivering high-precision, ultra-reliable fastening solutions to global industries, with full-process quality control and international authoritative certifications ensuring every product meets the highest global standards.

Core Product Range

Multi-Jackbolt Pretensioners (MJP) – Super Nut

Patent-protected (China Patent No.:202522022988.8) | ISO 898-2 compliant | -25℃ to +250℃

Pure axial pretensioning, torsion-free clamping force, precise & stable preload (M30-M150, 214-5750kN). Even thread stress distribution extends bolt life; operable with standard torque wrenches for easy installation.

FN-Flexnuts

ISO 898-2 compliant | M30-M150 | Max preload 7700kN

FNM (Grade 8) / FNH (Grade 10) variants, unique structure relieves stress concentration. Hardened washers protect components; paired with MJP for precise preload, boosting connection safety for high-stress applications. Custom materials/surface treatments available.

Hydraulic Fastening Bolt

ISO 898-1 compliant | Flange connection specialist

Ideal for high-dynamic scenarios (e.g., large motor flanges). Reusable, easy to assemble/disassemble, prevents bolt rebound. Taper sleeve fills bolt-hole gaps, reducing machining requirements; fits 40-138mm mounting holes (M33-M105 threads).

Uncompromising Quality

• Premium Raw Materials: Selected alloy steel/duplex stainless steel, with strict spectral & ultrasonic testing for zero material defects.
• In-House Core Processes: Forging, CNC machining, heat treatment all completed internally, ensuring precision (±0.01-0.02mm) and high tensile strength (≥1000MPa).
• Rigorous Lab Testing: In-house physicochemical & performance labs conduct full inspections; laser marking for complete product traceability.
• Global Certifications: Authoritative international accreditations, with independent certification capability for custom fasteners.

Custom Solutions & Support

Tailored fastening solutions for specific working conditions (custom materials, surface treatments, thread clearances). Professional on-site technical, installation and maintenance support worldwide.