Wiha 66990 Ball End Hex Key Set 1.5-10mm 9 Piece

Product Description

The WIHA 66990 is a 9-piece L-key ball end hex key set covering a full range from 1.5 mm to 10 mm. Each key features a ball end on the long arm, allowing fastener engagement at angles up to 25 degrees without removing and repositioning the tool. The short arm provides the straight drive needed for high-torque seating. Made from steel, these keys are suited for machine assembly, equipment installation, and maintenance tasks where a range of metric hex sizes is required. Technicians across HVAC, mechanical, and general trade applications keep this set as a bench or field staple.

This set is appropriate for residential and commercial service environments wherever metric hex fasteners are encountered. Typical applications include servicing compressor mounting hardware, motor brackets, access panels, and equipment enclosures. The 9 individual sizes — 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, and 10 mm — cover the most common metric hex drive fasteners found on HVAC equipment, pumps, and electrical enclosures.

Key Features

• Ball end on long arm allows off-axis engagement for faster fastener access in tight spaces
• Straight short arm provides full torque drive for final tightening
• 9 metric sizes: 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, and 10 mm
• Steel construction for durability under repeated use
• L-key form factor provides two driving positions per key

Compatibility

Designed for use with standard metric hex socket head fasteners in the 1.5 mm to 10 mm range, as commonly found on HVAC equipment, pumps, motors, and mechanical assemblies.

Installation Notes

Hand tools require no special licensing but should be used by qualified technicians familiar with proper torque practices. Always select the correct key size to avoid rounding fastener heads. Use the short straight arm for final tightening to prevent over-torquing through the ball end. Inspect keys periodically for wear or deformation and replace any damaged tools before use.