Williams Comfort Products JHWISFXT420 Flextension 3/8 Drive

Product Description

The WILLIAMS COMFORT PRODUCTS JHWISFXT420 is a Flextension — an integrated drive extension and socket unit designed for engine assembly, heavy equipment manufacturing, and mechanical repair. The 3/8 inch drive, 5/8 inch, 6-point design combines the extension and socket into a single non-removable assembly, eliminating the risk of the socket separating from the extension during continuous operation. The socket opening uses a SUPERTORQUE lobular profile, which transfers greater turning force to the fastener without deforming the head. Maximum working torque is rated at 160 ft-lbs (1,920 in-lbs / 217 Nm). Weighing 0.45 pounds, this tool is built for production and service environments where reliability and uninterrupted workflow are priorities.

The JHWISFXT420 is suited for professional use in engine assembly lines, heavy equipment repair shops, and industrial maintenance settings. The Flextension accommodates up to a 30-degree angle offset, allowing technicians to reach fasteners in confined or angled positions. It is compatible with hand tools and power tools operating in impulse or direct-drive mode. This tool is NOT rated for impact tool use. The drive end includes a 7/32 inch cross-hole bevel to simplify installation and removal during operation.

Key Features

• Integrated non-removable socket and extension design prevents disconnection during use
• SUPERTORQUE lobular socket opening delivers higher turning power without deforming fastener heads
• Maximum working torque: 160 ft-lbs / 1,920 in-lbs / 217 Nm
• Up to 30-degree angle offset for access in tight or angled locations
• Drive end features a 7/32 inch cross-hole bevel for ease of engagement
• Socket retention pin is TIG welded for full rotation power transfer
• Durable Black Oxide finish for corrosion resistance
• Made in the U.S.A.

Compatibility

Designed for use with hand tools and power tools in impulse or direct-drive configurations. Not compatible with impact tools. Additional lengths and socket sizes are available by special order.

Installation Notes

This Flextension is installed by qualified mechanics and industrial assembly technicians using 3/8 inch drive hand or power tools. Before use, confirm the tool is fully seated on the drive and that the application does not involve impact tool operation, as this unit is not rated for impact use. Consult applicable torque specifications for the fastener being driven and do not exceed the rated maximum working torque of 160 ft-lbs.

Technical Specifications

• Drive Size: 3/8 inch
• Socket Size: 5/8 inch
• Point Configuration: 6-Point
• Maximum Working Torque: 160 ft-lbs / 1,920 in-lbs / 217 Nm
• Maximum Angle Offset: 30 degrees
• Cross-Hole Bevel: 7/32 inch
• Finish: Black Oxide
• Weight: 0.45 pounds
• Country of Origin: U.S.A.

Standard Information

• Brand: WILLIAMS COMFORT PRODUCTS
• Manufacturer Part Number: JHWISFXT420