The small hole dial bore gauge is an instrument designed for checking internal diameters on small bores, where a traditional dial bore gauge is often too bulky or less suitable for the geometry being measured. It is a particularly useful solution when inspecting small bores and narrow internal diameters thanks to a compact configuration specifically developed for operation in restricted spaces.
This series is supplied without dial gauge, allowing the user to configure the instrument according to the required application. Depending on the inspection requirements, it can be fitted with analog or digital indicators, in either 0.01 mm or 0.001 mm resolution, making it possible to build a measuring system consistent with the required accuracy level and the instrumentation already available in the workshop.
One of the most interesting features of this dial bore gauge is the presence of interchangeable measuring heads, each fitted with spherical contacts. This configuration makes the instrument particularly suitable for small bores, since the spherical contact improves positioning inside the bore, while the possibility of replacing the measuring heads allows the diameter range to be adapted to the required measuring span. This makes the instrument more versatile and suitable for different inspection requirements within its operating range.
Another important feature is the manual retraction mechanism, designed to simplify insertion into the bore. In practice, the operator can retract the contact system during insertion, making access easier in small internal diameters and reducing the difficulty of measurements on particularly inaccessible bores. This represents a real operational advantage both in practical use and in improving measurement handling.
The operating principle remains that of a comparative internal dial bore gauge. After setting the instrument against a known reference, it is inserted into the bore and oscillated until the reversal point of the dial gauge is identified. At that point, the deviation from the preset reference value is read. This method allows not only the inspection of the internal diameter, but also the verification of possible differences between measurements taken in different orientations.
The series is available with either hardened steel contacts or carbide contacts, allowing better adaptation to the application type and inspection frequency. The carbide version is particularly advantageous where increased wear resistance is required during repetitive inspections.
From an operational standpoint, this small hole dial bore gauge is intended for machine shops, toolrooms and quality control departments that need to inspect reduced internal diameters using a dedicated instrument, more suitable than a standard dial bore gauge for small bore applications. It is an excellent solution whenever easier access, flexible configuration and reliable inspection on small internal diameters are required.
Applications
- Measurement of internal diameters on small bores
- Inspection of small internal holes
- Internal measurements in restricted-access areas
- Dimensional inspection in workshops
- Use in production and quality control
FAQ – Small hole dial bore gauge
What is a small hole dial bore gauge?
It is a comparative measuring instrument for reduced internal diameters, specifically designed for inspecting small bores and narrow internal holes with a more compact configuration than a standard dial bore gauge.
What is a small hole dial bore gauge used for?
It is used for inspecting internal diameters on small bores, especially where restricted spaces require a more compact dedicated instrument.
Why is this dial bore gauge suitable for small diameters?
Because it combines a compact structure for restricted spaces, interchangeable measuring heads with spherical contacts and a manual retraction mechanism that facilitates insertion into the bore.
What is the advantage of interchangeable measuring heads?
They allow the instrument configuration to be adapted to the required measuring range, making the dial bore gauge more versatile for inspecting small bores.
What is the purpose of the manual retraction mechanism?
It simplifies insertion of the instrument into the bore, making measurements easier in very small internal diameters.
Is this dial bore gauge supplied with a dial gauge?
No, this series is supplied without dial gauge, allowing the user to choose the most suitable indicator according to the application.
Which indicators can be fitted?
Analog or digital indicators can be used, in either 0.01 mm or 0.001 mm resolution, depending on the required accuracy level.
How does a small hole dial bore gauge work?
The instrument is set against a known reference, inserted into the bore and oscillated until the reversal point of the dial gauge is found. The deviation from the preset reference is then read.
Which measuring ranges are available?
The series is available in the ranges 5-10 mm and 10-20 mm.
What measuring depth is available?
The measuring depth is 70 mm.
Is it available with both steel and carbide contacts?
Yes, the series is available in both versions in order to better suit the application type.
What is the difference between steel contacts and carbide contacts?
Steel contacts are suitable for general-purpose use, while carbide contacts are particularly advantageous where higher wear resistance is required during repetitive inspections.
Who is this dial bore gauge intended for?
It is intended for machine shops, toolrooms and quality control departments that need to inspect small internal diameters using a dedicated and configurable instrument.
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Hardened stainless steel contancts
| Code | Range (mm) | Depth(mm) |
| SA7115 | 5 – 10 | 70 |
| SA7116 | 10 – 20 |
Carbide contacts
| Code | Range (mm) | Depth(mm) |
| SA7115H | 5 – 10 | 70 |
| SA7116H | 10 – 20 |
