Trilock Plug Gage Assemblies

Vermont’s Trilock Plug Gage Assemblies are engineered for robust, large-diameter hole inspection, featuring a dual-ended reversible design that significantly extends gage life. Each assembly is built with hardened tool steel (60–65 Rc), micro-finished to 4 µin for Class X and 10 µin for Class ZZ, and includes GO (plus tolerance) and NO‑GO (minus tolerance) plug members secured to a durable handle via mounting bolts—designed for quick reversal when one end shows wear. Available in diameters from 0.7600″ to 6.0100″, these assemblies support Class X tolerances (“perfect for shop floor and metrology labs”) and the more economical Class ZZ option (± 0.0002″), both sold with one line of custom marking (up to 25 characters) and backed by a Certificate of Accuracy, with ISO 17025–traceable calibration available.

Whether you choose Class X for tighter tolerance jobs or Class ZZ for cost-effective, general-purpose inspection, Vermont’s Trilock system balances precision, convenience, and longevity. The reversible plug design reduces replacement frequency, the custom handle marking ensures traceability, and the included certification supports rigorous quality standards. Ideal for operators seeking efficient GO/NO‑GO gauging across a wide size range, these assemblies are a smart, durable solution for ensuring hole diameter compliance.