Dayco Belt Size Gauge

Dayco Belt Size Gauges: Precision Measurement from a Belt-Drive Authority

When it comes to identifying the right replacement belt, guesswork is never an option. Dayco — a manufacturer with more than 120 years of engineering heritage — brings that same depth of expertise to its line of belt size gauges, giving technicians and DIYers a fast, reliable way to measure belts and cross-reference exact Dayco replacement part numbers on the spot.

The Factfinder® Gauge Series

Dayco's Factfinder® Gauges are designed to help users find exact Dayco replacement belts instantly. The lineup covers a wide spectrum of belt types and sizes, making it a go-to diagnostic toolkit in professional shop environments.

• Factfinder® Gauge II (SKU 93859): Measures belts up to 100" and shows the top width and length/part number of the corresponding Dayco FHP Utility V-Belt, GPL Premium Utility Belt, Industrial A and B Belts, plus 3VX and 5VX Dayco Gold Label® VX-Wedge Belts.
• Factfinder® Gauge III (SKU 93860): Measures all multi-ribbed belts, including competitive and OEM belts, for belts up to 115" in effective length for multi-rib belts and 100" for V-belt lengths, then indicates the corresponding Dayco replacement belt size.
• Factfinder® Gauge III Extension (SKU 93863): Extends measurement of V-belts up to 130" and multi-ribbed belt measurements up to 145", and easily attaches to the Dayco Factfinder® Gauge III for seamless coverage of larger industrial and heavy-duty applications.

Beyond Sizing: The aWEARness® Gauge

Dayco also addresses belt condition assessment, not just sizing. The aWEARness Gauge is designed to measure a belt's rib depth, rib profile, and cracks. By simply placing the notched area lengthwise over the ribbed section of the belt, this pocket-size device quickly and easily identifies the potential of serpentine belt failure. Together with the Factfinder® series, it forms a comprehensive belt diagnostic toolkit.

Shop-Ready Convenience

Mounting brackets allow the Dayco Factfinder® Gauge III to be mounted on a wall, counter, or convenient location of your choice, permitting both hands to be free for accurate measuring and easy size verification of conventional V-belts or multi-rib belts. This hands-free capability makes the gauge especially practical in busy service bays where efficiency is paramount.

Why Dayco's Gauges Stand Apart

Dayco is a global leader in the research, design, manufacture, and distribution of essential engine drive systems and aftermarket services for automotive, truck, construction, agriculture, and industrial applications. Because Dayco manufactures the belts and the gauges, every measurement maps directly back to a verified Dayco part number — eliminating the trial-and-error that can come with generic measuring tools. Whether you're servicing a passenger car, a piece of agricultural equipment, or a marine engine, Dayco's belt size gauge lineup is engineered to deliver confident, accurate results every time.

Explore the full Dayco brand catalog or browse all belt size gauges to find the right measurement solution for your application.