The DongCheng HD092602 9-Piece Extra Long Hex Key Set is engineered for maximum reach and high turning torque in heavy industrial equipment, automotive engine blocks, and deeply recessed machinery fastenings. Built with extra-long shafts, these wrenches allow technicians to navigate past surrounding obstructions and apply substantial torque to loosen frozen, thread-locked hex fasteners.

Drop-forged from premium Chrome Vanadium (CR-V) alloy steel, the keys undergo specialized induction heat treatment to prevent shaft twisting or edge rounding under maximum torque loads. Finished with a protective mirror chrome plate for corrosion resistance, this 9-piece kit spans 1.5mm to 10.0mm. Held in a size-stamped, quick-access holder and packaged in a slide blister.

Key Features

• Maximum Extra-Long Reach: Ultra-extended shaft length bypasses obstacles and reaches deeply recessed fasteners.
• Maximum Torque Leverage: Extra length provides high mechanical advantage to crack loose frozen socket screws.
• Premium CR-V Steel Construction: High-strength Chrome Vanadium alloy resists permanent twisting and deformation.
• Corrosion-Resistant Chrome Plating: Polished protective coating prevents oxidation and shop liquid corrosion.
• 9 Metric Sizes Included: Full coverage from 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, to 10mm.
• Convenient Storage Clip: Heavy-duty indexed bracket keeps keys organized and visible.

Applications

• Deeply recessed cylinder head bolts, industrial motor brackets, and pump assemblies
• Commercial machinery maintenance, heavy conveyor installations, and toolroom servicing
• Truck and heavy vehicle engine compartment maintenance
• Factory automation, pneumatic valve manifolds, and robotic equipment servicing

Technical Specifications

Size/Model-wise Table