When maximum strength is required, JLHY's high strength metric bolts deliver. Available in Grade 8.8, 10.9, and 12.9, these heat-treated alloy steel bolts achieve tensile strengths from 800 MPa to over 1220 MPa — significantly above standard commercial grades. This makes them the right choice for highly loaded joints in machinery, automotive, and structural applications.

The mechanical classification indicates tensile strength (first number × 100 = MPa) and yield ratio (second number ÷ 10 = percentage of tensile). A Grade 12.9 bolt achieves 1220 MPa tensile with approximately 1100 MPa yield, providing exceptional preload capability and vibration resistance.

Produced from chromium-molybdenum alloy with precise heat treatment for consistent, uniform properties. Thread quality meets ISO 6g tolerance for reliable preload prediction. We recommend using matching grade nuts and hardened washers for proper joint rating. Contact our technical team for load and preload guidance.