Williams QJO18A Torque Wrench Head 9/16 Inch Open End

Product Description

The WILLIAMS QJO18A is an open-end torque wrench head designed for use with J-shank torque wrenches in precision fastening applications. The 9/16-inch open-end head accepts a J-type shank measuring 0.425 inches and delivers a maximum torque capacity of 58 foot-pounds. The center-of-fastener to retaining-pin distance measures 2.5 inches, providing consistent reach and positioning during use. This head is installed by mechanics, maintenance technicians, and trade professionals who require controlled torque output in tight or awkward fastening locations where a standard fixed-head torque wrench cannot reach effectively.

This torque wrench head is suited for industrial maintenance, HVAC equipment assembly, mechanical service work, and trade applications where SAE fastener sizes are standard. It is sold as a single unit and is intended for use with compatible J-shank torque wrench handles. The open-end design allows engagement with fasteners that are not accessible from above, making it practical in equipment panels, pipe connections, and machinery frames.

Key Features

• 9/16-inch open-end head for SAE fastener engagement
• J-type shank with 0.425-inch shank diameter for compatible handle fitment
• Maximum torque rating of 58 foot-pounds
• Center-of-fastener to retaining-pin distance of 2.5 inches
• Lightweight at 0.17 pounds for reduced hand fatigue during extended use
• Sold individually as a single interchangeable head

Compatibility

Designed for use with J-shank torque wrench handles that accept a 0.425-inch J-type shank. Confirm handle shank compatibility before installation.

Installation Notes

Installation and use should be performed by qualified technicians familiar with torque wrench systems. Before attaching or removing torque wrench heads, ensure the torque wrench handle is set to its lowest torque value to relieve tension on the mechanism. Verify that the retaining pin is fully seated before applying torque to any fastener. Do not exceed the rated maximum torque of 58 foot-pounds to avoid damage to the head or fastener.

Technical Specifications

• Head Size: 9/16 inches
• Head Type: Open End
• Shank Type: J
• Shank Size: 0.425 inches
• Maximum Torque: 58 foot-pounds
• Center of Fastener to Retaining Pin: 2.5 inches
• Length: 0.4 inches
• Width: 1 inch
• Height: 3 inches
• Weight: 0.17 pounds
• Standard: SAE
• Sold As: Each

Standard Information

• Brand: WILLIAMS
• Manufacturer Part Number: QJO18A