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GPS Tolerance Calculator — ISO 14405-1
ISO 14405-1 GPS size tolerance reference. Enter nominal size and fit to see specification operators, limits, and interpretation per the GPS framework.
Results
ISO 14405-1 Specification Operators
| Symbol | Name | Description | Typical Use |
|---|---|---|---|
| LP | Two-point size | Distance between two opposing points (default) | Caliper/micrometer measurement |
| GG | Least-squares size | Gaussian (best-fit) diameter | CMM, roundness tester |
| GX | Max. inscribed size | Largest perfect cylinder that fits inside | Holes (functional gauge) |
| GN | Min. circumscribed size | Smallest perfect cylinder that fits around | Shafts (functional gauge) |
| CC | Circumference diameter | Diameter from circumference measurement | Tape measure |
| CA | Area diameter | Diameter from cross-sectional area | Optical measurement |
Default rule: If no specification operator is indicated, LP (two-point size) applies per ISO 14405-1. This is the traditional caliper/micrometer measurement.
Professional field instruments and software.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
