Plug Gauges for Bore and Internal Inspection | ULTRA Shop

Buy high-precision cylindrical plug gauges, flat plug gauges, and matching accessories for rapid go/no-go inspection of internal geometries online.

Plug gauges and hole gauges form the reliable foundation for rapid and dependable dimensional and form inspection of internal geometries directly within industrial series production and quality assurance. Strictly adhering to metrological principles, these measuring instruments separate the testing process flawlessly: the long "go" end inspects the minimum dimension of the bore as well as geometric form deviations (such as lack of roundness or cylindricity), while the short, red-marked "no-go" end exclusively checks the maximum dimension. This efficient gauging procedure minimizes inspection cycle times right on the shop floor or in the measuring room, ensuring seamless compliance with tight tolerance zones in toolmaking, mechanical engineering, and the automotive industry.

Our B2B portfolio covers all facets of modern internal inspection and is divided into three specialized areas:

• Cylindrical Plug Gauges (DIN 2245): The time-tested standard for cylindrical bores. Available for standard tolerances like H7 in the diameter range from Ø 1.0 mm to 100.0 mm. For maximum flexibility with intermediate sizes, you can configure your gauges down to 3 decimal places (steps of 0.001 mm) directly in the ULTRA online shop.
• Flat Plug Gauges (DIN 2246 / 2247): Specialized flat gauges for precise dimensional inspection of wide slots, keyways, or flat recesses where cylindrical plugs cannot be applied.
• Accessories for Plug Gauges: Ergonomic aluminum handles (hexagonal shape, anodized), durable collets, and hexagonal handles for secure, material-gentle mounting of your test bodies. Effectively protects the gauges from body heat and simplifies handling in demanding workshop environments.

Depending on the workpiece properties, you can choose flexibly from a material variety that is unique in the market: wear-resistant gauge steel, exceptionally durable tungsten carbide for high-frequency testing of abrasive materials, or high-strength ceramics for scratch-sensitive, anti-magnetic surfaces. All gauges and complete sets in protective wooden cases guarantee seamless, traceable calibration through optional factory or DAkkS certificates.