Fel-Pro 935DAA Digital Angle Gauge with Angle Alert

The Fel-Pro 935DAA Digital Angle Gauge with Angle Alert is a precision measuring tool designed to simplify torque-to-yield (TTY) and angle-based fastener tightening procedures. Used in professional and DIY engine rebuilds and repairs, this gauge accurately measures the number of degrees a fastener has been rotated during the final tightening stage — a critical step when working with modern TTY head bolts, rod bolts, and other angle-spec fasteners.

Key Features:

• Digital readout provides precise angle measurements during fastener tightening
• Angle Alert feature audibly and/or visually signals when the target rotation angle has been reached, reducing the risk of over- or under-tightening
• Compatible with standard 3/8 in. drive ratchets and torque wrenches
• Zero-reset function allows quick setup between fasteners
• Compact, lightweight design fits into tight engine bay spaces
• Easy-to-read digital display for accurate real-time feedback
• Ideal for use with torque-to-yield (TTY) fasteners including head bolts, main cap bolts, and connecting rod bolts

The Fel-Pro 935DAA is an essential tool for any mechanic performing engine work that specifies angle-tightening procedures. Its Angle Alert functionality takes the guesswork out of critical assembly steps, ensuring every fastener is tightened to exact manufacturer specifications for reliable, long-lasting repairs.