Williams Comfort Products JHWISFXT618 Flextension 3/8 Drive

Product Description

The WILLIAMS COMFORT PRODUCTS JHWISFXT618 is a Flextension — an integrated drive extension and socket assembly designed for high-demand fastening work in engine and heavy equipment manufacturing, assembly, and repair. The 3/8-inch drive unit accepts a fixed 9/16-inch socket that is permanently joined to the extension, eliminating the risk of the socket separating from the drive during continuous operation. The socket features SUPERTORQUE lobular openings that increase turning power while reducing fastener deformation. Maximum working torque is rated at 160 ft-lbs (1,920 in-lbs or 217 Nm). A TIG-welded retention pin transfers full rotational power to the socket reliably under sustained load.

This Flextension is built for professional technicians working in engine assembly lines, heavy equipment repair bays, and production environments where a socket dropping off the extension causes costly downtime. The up-to-30-degree angle offset allows access to fasteners in tight or awkward positions. The drive end includes a 7/32-inch cross-hole bevel for easier handling and engagement. Designed for use with hand tools and power tools running impulse or direct-drive operation. This tool is NOT rated for impact tool use.

Key Features

• Integrated non-removable socket design prevents disconnection during continuous work
• SUPERTORQUE lobular socket opening increases turning power without deforming fasteners
• TIG-welded socket retention pin delivers full rotational power transfer
• Up to 30-degree angle offset for access in confined spaces
• 7/32-inch cross-hole bevel at drive end for ease of engagement
• Durable black oxide finish for corrosion resistance
• Made in the U.S.A.

Compatibility

Designed for use with 3/8-inch drive hand tools and impulse or direct-drive power tools. Not compatible with impact tools. Other lengths and socket sizes are available by special order through Snap-on Industrial Brands representatives.

Installation Notes

This Flextension is a hand and power tool accessory installed by mechanics, assemblers, and equipment technicians. Before use, confirm the tool driving this extension is not an impact tool, as impact use is not permitted and may cause failure. Inspect the TIG-welded pin and socket joint before each use for signs of wear or damage. Do not exceed the rated maximum working torque of 160 ft-lbs.

Technical Specifications

• Drive Size: 3/8 inch
• Socket Size: 9/16 inch
• Maximum Working Torque: 160 ft-lbs / 1,920 in-lbs / 217 Nm
• Angle Offset: Up to 30 degrees
• Drive End Cross-Hole Bevel: 7/32 inch
• Finish: Black Oxide
• Weight: 0.55 pounds
• Country of Origin: U.S.A.

Standard Information

• Brand: WILLIAMS COMFORT PRODUCTS
• Manufacturer Part Number: JHWISFXT618