The Wheeler F.A.T. Wrench® AutoTorque™ is a battery-powered electronic torque screwdriver engineered for precise firearms assembly and optics mounting. Featuring an integrated digital LCD screen adjustable in 0.1 in-lb increments, the tool delivers controlled torque from 10 to 65 in-lbs (approximately 1.13 to 7.34 Nm). An automatic torque limiter stops rotation the moment target torque is reached, preventing stripped threads, sheared fasteners, or damaged scope tubes. Powered by an internal rechargeable lithium-ion battery pack, it charges via low-voltage 5V DC USB power and delivers up to 2 hours of continuous run-time.

Key Features

• Digital Auto-Stop Limiter: Automatically stops bit rotation once the user-selected torque limit is reached between 10 and 65 in-lbs to prevent over-tightening.
• Variable Speed Motor: Low-speed motor operates at speeds up to 200 RPM for controlled fastening, complemented by a dedicated "Max" bypass mode for breaking loose stubborn fasteners.
• Standard Bit Interface: Compatible with standard 1/4-inch hex drive bits and includes a 15-piece black-phosphate-coated bit set for common firearms fasteners.
• Integrated Illumination: Features 4 forward-facing ultra-bright LEDs to illuminate scope rings, actions, and receiver work areas.
• USB Rechargeable: Internal lithium-ion battery recharges via standard USB connection and eliminates the need for 240V mains tethering during bench work.
• Storage Case: Ships in a latchable, stackable hard storage case.

Specifications

• Torque Range: 10 to 65 in-lbs (0.1 in-lb digital increments)
• Motor Speed: Variable up to 200 RPM
• Drive Compatibility: Standard 1/4-inch hex drive
• Battery: Internal rechargeable Lithium-Ion (USB-chargeable)
• Run-Time: Up to 2 hours continuous operation
• Work Lights: 4 integrated forward-facing LEDs
• Included Bit Set: 15 black-phosphate-coated 1/4-inch hex bits

Who is the Wheeler Fat Wrench Auto Torque for?

• Gunsmiths mounting rifle scopes — Requires repeatable fastening within a 10 to 65 in-lbs torque range to secure ring caps (typically 15–18 in-lbs) and base clamp bolts (45–55 in-lbs) using this electronic torque screwdriver without crushing optic tubes.
• Shooters installing red-dot plates and action screws — Relies on 1/4-inch hex drive bit compatibility, up to 2 hours continuous run-time, and precision digital auto-stop shutoff to torque optic mounting hardware and action fasteners to exact manufacturer specifications.

Less suitable for: Fasteners requiring less than 10 in-lbs of torque, which fall below the limiter threshold and require manual micro-torque drivers; or heavy-duty components exceeding 65 in-lbs (such as barrel nuts and receiver extensions), which require a 3/8-inch or 1/2-inch mechanical click-type torque wrench.