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High-Precision Plain Plug Gauges & Ring Gauges | Custom ISO/ANSI Standard Measuring Tools

  • Precision Grades: Available in Class XX, X, Y, Z to meet ultra-precise inspection requirements.
  • Premium Materials: Choice of Zirconia Ceramic, Tungsten Carbide, or Hardened Tool Steel (GCr15) for 5-10x longer service life.
  • Certified Quality: 100% full inspection in a $20^\circ$C constant temperature laboratory with traceable factory calibration reports.
  • Global Reliability: Trusted OEM partner for aerospace, medical, and automotive industries across Europe and North America.
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What is a plain gauge?

Mihe Precision manufactures high-precision Plain Gauges, including Plug Gauges and Ring Gauges. These are essential reference tools in mechanical machining used to verify whether hole and shaft dimensions meet “GO” and “NO-GO” tolerances.

We apply a sub-zero treatment process to ensure the dimensional stability of the material and prevent micron-level deformation during long-term use. Whether used for rapid inspection in mass production or as reference calibration in laboratories, Mihe gauges deliver sub-micron repeatability, ensuring that every finished product meets strict industry tolerance standards.

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Excellent Material Hardness and Wear Resistance

We offer options in zirconia ceramic (ZrO₂) and tungsten carbide. The ceramic material features rust-free performance, no need for anti-rust oil maintenance, and a coefficient of thermal expansion close to that of steel. Its service life is 5–10 times longer than that of standard tool steel gauges, significantly reducing long-term procurement costs.

20°C Constant-Temperature Machining and Ultra-Precision Grinding

Relying on inspection equipment from Feinmess Jena (Germany) and TESA (Switzerland), all plain gauges undergo final grinding in a constant-temperature environment. The surface roughness can reach Ra 0.05 μm or below, delivering a mirror-like finish. This ensures minimal insertion resistance when the gauge enters the hole, providing an exceptionally precise and smooth measuring feel.

Comprehensive Customization Services

In addition to ISO, DIN, JIS, and ANSI standard specifications, we specialize in custom non-standard dimensions based on customer drawings, such as special-length gauges, grooved plug gauges, and step gauges. We also provide a 1-year quality warranty and support third-party certification services.

Technical Specifications

(Parameter)

(Value)

Material Options

Zirconia Ceramic, Tungsten Carbide, GCr15 Bearing Steel

Type

Plain Plug Gauge (Go/No-Go), Plain Ring Gauge

Diameter Range

0.1mm – 300mm (Customizable >10mm)

Tolerance Class

Class XX, X, Y, Z (Follows ANSI/ASME B89.1.5)

Hardness

Ceramic (HV 1100-1300), Tungsten Carbide (HRA 90-92), Steel (HRC 58-65)

Surface Roughness

Ra 0.05μm – 0.2μm

Standard Compliance

ISO 1502, DIN 7150-2, GB/T 3934, ANSI B1.20.1

Applications

Aerospace For hole diameter verification of aircraft engine components and precision fasteners.
Medical Devices For precision fit and clearance inspection of orthopedic implants and surgical instruments.
Automotive For precision hole position measurement in engine blocks, transmission systems, and new energy battery modules.
Defense & Military Meeting the stringent requirements of the defense and military industry for extreme stability and full traceability of measuring instruments.
Mold & Die Calibration of fit accuracy for mold guide pillars and guide bushings.

Packaging & Shipping

  • Protective Packaging： Each gauge is individually vacuum-sealed in anti-static packaging and coated with high-grade anti-rust oil (steel models only), then housed in a custom shockproof wooden case or thickened plastic box.
  • Identification: Every box features a unique serial number and specification label, with an original factory inspection report included inside.
  • Logistics Support: Specialized in the European and American markets, we support DHL/FedEx express air freight to ensure goods arrive at global laboratories in pristine condition.

FAQ About Plain Gauges

Zirconia ceramic offers extremely high hardness and excellent chemical stability. It does not corrode from hand sweat and provides significantly superior wear resistance compared to steel. In high-frequency inspection applications, ceramic gauges maintain dimensional accuracy for a much longer period, reducing the risk of false inspection results caused by gauge wear.

All our gauges are calibrated using TESA length measuring instruments from Switzerland. Each product is delivered with a Factory Inspection Report, and our manufacturing process complies with ISO 9001 standards. The measurement results are fully traceable to international standards.

Yes. We are equipped with advanced grinding machines and precision lapping equipment, and specialize in bespoke custom precision gauges. Standard stocked items can be shipped within 24 hours, while customized products are typically delivered within 7–15 working days.

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