The plain plug gauge GO/NO GO, often also called GO/NO GO plug gauge or plain limit plug gauge, is an instrument designed for the fast inspection of holes and smooth internal diameters. It is used whenever the purpose is not to read a numerical value as with a bore gauge or another measuring instrument, but simply to verify immediately whether the hole complies with the required dimensional limits.
The operating principle of the GO/NO GO plug gauge is simple yet extremely effective. The GO side must enter the hole correctly, while the NO GO side must not enter. This makes the inspection practical, fast and repeatable, which is why plain plug gauges are widely used in production inspection and repetitive dimensional control.
From an operational point of view, this type of inspection is particularly useful whenever many parts must be checked quickly. A plain limit plug gauge allows a functional inspection to be carried out immediately, reducing inspection time compared with a complete numerical measurement and also limiting subjective interpretation of the result. For this reason, GO/NO GO gauges are widely used in mechanical workshops, tooling departments and quality control environments.
The H7 GO/NO GO plain plug gauges are available from Ø 3 mm to Ø 100 mm. In addition to the standard range, we also manufacture special plug gauges on request, both for non-standard hole diameters and for special tolerances according to the required application.
From a manufacturing point of view, the GO/NO GO plug gauge is produced in hardened steel, a suitable choice to ensure good wear resistance during repetitive inspections. This characteristic is particularly important whenever the instrument is used frequently on production batches, where operational continuity and long-term inspection stability are essential.
With a plain GO/NO GO plug gauge, the purpose is not simply to obtain a measurement, but essentially to verify the functional conformity of the hole. It is therefore a highly practical solution whenever it is necessary to decide whether a component can be accepted or rejected without performing a complete dimensional reading each time.
From an application point of view, plain plug gauges are suitable for checking smooth cylindrical holes and internal diameters on mechanical components, serial production parts, tooling and machining applications where hole tolerance must be verified with a fast and reliable inspection method. The possibility of supplying special dimensions and tolerances on request also makes them suitable for less standardised applications.
Applications
- Fast inspection of holes and smooth internal diameters
- Functional inspection of holes in production
- Repetitive dimensional inspection on mechanical components
- Verification of internal diameters on machined parts
- Use in workshops, tooling departments and quality control
- Immediate inspection with GO/NO GO logic
- Fast inspections directly on the production floor
- Applications with special dimensions or tolerances on request
FAQ – Plain plug gauge GO/NO GO
What is a plain plug gauge GO/NO GO?
It is an instrument used for the fast inspection of holes and smooth internal diameters using a GO/NO GO system.
How does a GO/NO GO plug gauge work?
The GO side must enter the hole, while the NO GO side must not enter. If the inspection behaves this way, the hole complies with the required limits.
When are GO/NO GO plug gauges used?
They are mainly used in fast production inspections whenever many parts must be checked with a simple, immediate and repeatable method.
Why choose a plain plug gauge instead of a numerical measurement?
Because it allows a fast functional conformity inspection of the hole, particularly useful in repetitive production inspections and directly on the shop floor, while reducing subjective interpretation.
What is inspected with a plain GO/NO GO plug gauge?
It is used for inspection of holes and smooth internal diameters, verifying whether the machining result falls within the required tolerance.
Are plain plug gauges suitable for repetitive inspections?
Yes, they are particularly suitable for repetitive inspections because they allow fast and easily repeatable verification on large batches of identical components.
What dimensional range is available for the H7 series?
The standard range is available from 3 mm to 100 mm.
Are special executions available?
Yes, special executions are available on request.
What material are GO/NO GO plug gauges made from?
They are manufactured in hardened steel, a suitable solution for ensuring good wear resistance during repetitive inspections.
Who are GO/NO GO plug gauges intended for?
They are intended for mechanical workshops, tooling departments, inspection and quality control environments requiring fast verification of hole conformity.
What are the most common mistakes when using plain GO/NO GO plug gauges?
The most common mistakes are using the gauge on dirty or burred holes, forcing the NO GO side and interpreting the inspection as a numerical measurement rather than as a functional conformity check.
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