Williams Comfort Products JHWISFXTM412 Flextension 3/8 in Drive 12MM

Product Description

The WILLIAMS COMFORT PRODUCTS JHWISFXTM412 is a 3/8 inch drive, 12 MM, 6-point Flextension — a one-piece integrated drive extension and socket designed for high-demand fastening work. Unlike standard ball-retained sockets, the JHWISFXTM412 features a TIG-welded retention pin that permanently joins the socket to the extension, eliminating the risk of socket dropout during continuous operation. The SUPERTORQUE lobular socket opening delivers greater turning force while reducing fastener deformation. Maximum working torque is rated at 160 ft-lbs (1,920 in-lbs / 217 Nm). This tool is built for hand and power tool use, including impulse and direct drive applications.

The JHWISFXTM412 Flextension is used extensively in engine assembly, heavy equipment manufacturing, and mechanical repair environments where consistent socket retention and reliable torque transfer are critical. The up-to-30-degree angle offset allows access to fasteners in tight or angled positions that a rigid extension cannot reach. The drive end features a 7/32 inch cross hole bevel for easier tool engagement. This tool is suited for production line technicians, assembly workers, and professional mechanics who require a dependable, no-slip extension-socket combination on the bench or in the field.

Key Features

• Integrated one-piece design permanently joins extension and socket — no socket dropout risk
• TIG-welded retention pin provides full rotational power transfer to the socket
• SUPERTORQUE lobular socket opening increases turning force without deforming fasteners
• Up to 30 degrees of angle offset for access in restricted spaces
• 7/32 inch cross hole bevel on drive end for easier engagement
• Black oxide finish for corrosion resistance and durability
• Made in the U.S.A.

Compatibility

Designed for use with hand tools and power tools including impulse and direct drive equipment. NOT FOR IMPACT TOOL USE. Compatible with standard 3/8 inch drive tool systems.

Installation Notes

This Flextension is intended for hand tool and power tool use only — do not use with impact drivers or impact wrenches. Verify the drive coupling is fully seated before applying torque. Do not exceed the maximum working torque of 160 ft-lbs. Inspect the TIG-welded retention pin and socket opening for wear or damage before each use.

Technical Specifications

• Drive Size: 3/8 inch
• Socket Size: 12 MM
• Point Count: 6-Point
• 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
• Country of Origin: USA
• Weight: 0.45 pounds

Standard Information

• Brand: WILLIAMS COMFORT PRODUCTS
• Manufacturer Part Number: JHWISFXTM412