Extra High-Tensile Bolt with Nut M12x1.25 - Part Number: 18030-1240

The Bolt with Nut Fastening Set (part number 18030-1240, property class 12.9, metric fine pitch M12 × 1.25, total underhead length L = 40 mm, thread length G = 27 mm, unthreaded shoulder 13 mm, standard requirement 3 bolts per blade) is an ultra-high tensile structural fastener assembly engineered for soil cultivation machinery. Designed to withstand severe shear loads, high tensile stresses, and persistent rotational vibrations across compact and medium rotary tillers, walk-behind cultivators, and light harrows.

Key Features & Benefits

• Maximum Property Class 12.9: Quenched and tempered from high-performance alloy steel, delivering a nominal ultimate tensile strength of 1200 N/mm² and yield point of 1080 N/mm² to prevent bolt elongation, shear deformation, and brittle fractures during rocky soil impact.
• Metric Fine Thread Pitch (M12 × 1.25): The fine 1.25 mm pitch provides superior self-locking resistance against persistent working vibrations compared to coarse threads, ensuring consistent preload retention and clamping force.
• Precision 13 mm Unthreaded Shoulder: Keeps the primary shear boundary between the blade and mounting flange completely on the solid unthreaded body, eliminating notch stress concentrations on the thread and preventing mounting hole elongation.
• Three-Bolt Tine Mount Optimization: Supplied complete with a dedicated structural nut suited for property class 12.9 torque specifications, tailored for implements utilizing triple-bolt securing configurations (3 sets per blade) for maximum torsional rigidity.

Technical Specifications

Typical Application Scopes

Installation Technical Note: As a property class 12.9 structural fastener with M12x1.25 fine pitch, tighten using a calibrated torque wrench (recommended dry torque: approximately 130 – 145 Nm, unless otherwise indicated by the implement OEM). Check hardware torque after the initial hour of field operation.