Extra High-Tensile Bolt M16x1.5 - Part Number: 18030-1660

The Extra High-Tensile Hex Bolt (part number 18030-1660, property class 12.9, fine metric thread M16 × 1.5, total underhead length L = 60 mm, threaded length G = 40 mm, unthreaded shank 20 mm) is a heavy-duty structural fastener designed to withstand severe tensile loads, shear forces, and cyclical shock stresses. Engineered specifically for securing rotary tiller tines, flail mower hammers, subsoiler wear points, and critical mechanical assemblies on agricultural and earthmoving equipment.

Key Features & Benefits

• Maximum Strength Class 12.9: Hot-forged and precision heat-treated from alloy steel, delivering an ultimate nominal tensile strength of 1200 N/mm² and yield point of 1080 N/mm² to prevent bolt elongation, shear failure, and shock cracking.
• Fine Metric Pitch (M16 × 1.5): The 1.5 mm fine pitch offers enhanced resistance against vibration loosening compared to standard coarse threads, allowing accurate preload control and consistent clamping tension.
• Partially Threaded 20 mm Solid Shoulder: Keeps the critical shear boundary between the tool and mounting flange on the unthreaded solid shank, eliminating stress concentrations on the threads and preventing hole wear.
• Superior Fatigue Endurance: Built to endure dynamic vibration, centrifugal rotation, and high bending moments encountered in rocky or heavy clay soils.

Technical Specifications

Typical Application Scopes

Installation Technical Note: Pair this class 12.9 bolt with matching high-strength nuts (property class 12 or high-grade prevailing torque lock nuts). Use a calibrated torque wrench for installation (recommended dry tightening torque: approx. 300 – 330 Nm, unless otherwise specified by the equipment manufacturer).