The set 3-point internal micrometers is a solution designed for users who need to check internal diameters over several measuring ranges while keeping all instruments organised in the same case. The set provides a coordinated series of 3-point internal micrometers, already arranged and ready for use.
The practical advantage of the kit is the ability to cover a wide measuring range using several dedicated instruments, all contained in the same storage case. For example, in the 20–40 mm set, the kit includes the 20–25 mm, 25–30 mm and 30–40 mm micrometers. This makes work more organised and faster because all the measuring ranges remain immediately available.
From a functional point of view, each micrometer features a 3-point measuring head, a configuration particularly suitable for the direct inspection of bores, recesses and cylindrical seats. This measuring principle makes 3-point internal micrometers especially useful when continuity of contact, good repeatability and a direct mechanical reading of the internal diameter are required.
The availability of different kits allows users to choose the most suitable configuration according to the type of inspection to be carried out. The range includes versions such as 6–12 mm, 12–20 mm, 20–40 mm and 40–100 mm, each one composed of several individual measuring ranges that progressively cover the complete interval. In this way it is possible to set up a complete measuring solution according to the diameters most frequently checked in the workshop.
Each set is supplied with setting rings and extensions. The setting rings are used for the correct zero adjustment of each micrometer before measurement, while the extensions increase the measuring depth and make inspections easier in deeper internal areas. For the setting rings, an ACCREDIA calibration certificate or a calibration report can also be supplied on request.
From an organisational point of view, the set is an interesting choice because it provides a complete and consistent measuring kit. In many production environments this means working more efficiently, reducing the time required to search for the correct instrument and managing repetitive inspections on different diameters more effectively.
For machine shops, tooling departments and quality control areas, the 3-point internal micrometer set is therefore a practical solution when several internal dimensions must be covered with a simple logic: one case, several measuring ranges available, included accessories and a configuration suitable for the direct inspection of bores and internal diameters.
Applications
- Measurement of internal diameters across several measuring ranges
- Inspection of bores and cylindrical seats
- Dimensional inspections in workshops
- Repetitive internal inspections with several instruments in the same case
- Use in tooling departments, general mechanics and quality control
FAQ – Set 3-point internal micrometers
What is a set 3-point internal micrometers?
It is a kit composed of several 3-point internal micrometers collected in the same case, designed to cover a wide measuring range with dedicated instruments.
What is a set 3-point internal micrometers used for?
It is used to check internal diameters over several measuring ranges while keeping an organised and ready-to-use set for bores, holes and cylindrical seats.
Why choose a set instead of a single micrometer?
Because the set allows a wider measuring interval to be covered with coordinated instruments, avoiding the need for separate micrometers for every single range.
How are the sets composed?
Each set includes several micrometers that together cover the total measuring range indicated. For example, the 20–40 mm set includes the 20–25 mm, 25–30 mm and 30–40 mm ranges.
What is the advantage of having everything in one case?
It keeps all measuring ranges readily available, improving organisation and practicality during repetitive inspections.
How does a 3-point internal micrometer work?
It works through three measuring contacts positioned inside the bore, allowing direct internal diameter measurement according to the measuring range of the instrument.
Which applications are these sets suitable for?
They are suitable for inspections on bores, holes and cylindrical seats in workshops, tooling departments and quality control, especially when several close measuring ranges must be checked.
Are the setting rings included?
Yes, the sets are supplied with setting rings used for the correct zero adjustment of each micrometer before measurement.
What are the extensions used for?
The extensions increase the measuring depth, making inspections easier in deeper internal areas.
Is certification available for the setting rings?
Yes, an ACCREDIA calibration certificate or a calibration report can be supplied on request for the setting rings.
Which measuring ranges are available for the sets?
Versions such as 6–12 mm, 12–20 mm, 20–40 mm and 40–100 mm are available, with several individual ranges depending on the kit composition.
Who is this set recommended for?
It is recommended for machine shops, production departments, tooling departments and quality control areas that need to measure different internal diameters using a complete and organised kit.
What are the most common mistakes when using 3-point internal micrometers?
Common mistakes include incorrect zero adjustment, choosing the wrong measuring range, dirty internal surfaces and incorrect handling of the instrument inside the bore during inspection.
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| Product code | Range (mm) | Individual range (mm) | Setting rings (mm) | Extension rods (mm) |
| SAM770-KIT0612 | 6-12 | 6-8,8-10,10-12 | Ф 6,8,10 | 100 |
| SAM770-KIT1220 | 12-20 | 12-16,16-20 | Ф 16 | 150 |
| SAM770-KIT2040 | 20-40 | 20-25,25-30 30-40 | Ф 25,40 | 150 |
| SAM770-KIT40100 | 40-100 | 40-50,50-63,62-75 75-88,87-100 | Ф 40,62,87 | 150 |
