Outside blade micrometer – SA109

The outside blade micrometer is a measuring instrument developed for dimensional inspections on special components featuring external grooves, slots and similar profiles where a standard outside micrometer is not suitable. It is a practical solution for mechanical workshops, tool rooms and quality control applications when specific dimensions must be measured on geometries requiring dedicated measuring contacts.

The key feature of this micrometer is the presence of the blade contacts, which make it suitable for measuring grooves and slotted shafts. In this type of inspection, not only the hundredths reading is important, but also the correct shape of the measuring surfaces, because this is what allows the instrument to work consistently on profiles requiring a different support geometry compared to a standard outside micrometer.

Another important aspect of this instrument is the non-rotating spindle. During groove and slot measurements this feature is fundamental because it prevents the spindle from rotating and interfering with the groove during advancement. In this way contact with the workpiece becomes more suitable for the inspection and measurements can be performed with better continuity compared to configurations with rotating spindles.

From a construction point of view, the instrument features a hardened and ground micrometer screw together with a steel frame. The 0.01 mm resolution makes it suitable for hundredths dimensional inspections commonly required in many mechanical applications, especially when functional dimensions on external grooves and slotted shafts must be checked with a dedicated instrument.

Compared to a standard outside micrometer, the advantage here is not generic versatility, but specialization. The blade contacts allow inspection on profiles where standard measuring contacts cannot work correctly. This makes the instrument particularly useful in groove and slot inspections, especially when measurements must be performed more consistently than with non-dedicated instruments.

The available range covers measuring fields from 0-25 mm up to 75-100 mm, with 25 mm measuring steps. This allows users to select the most suitable outside blade micrometer according to the dimension to be inspected, while maintaining the same operating concept throughout the series.

From an operational point of view, this instrument is intended for users looking for a specific micrometer for external grooves and slotted shafts, capable of working on profiles requiring different contact geometry compared to a standard outside micrometer. It is the right solution when inspections must be performed using a dedicated instrument designed specifically for this type of application.

Applications

• Measurement on external grooves
• Inspection on slotted shafts
• Dimensional inspections in workshops
• Inspection on components with slotted profiles
• Use in tool rooms and quality control departments
• Measurements on mechanical components with specific geometries
• Applications requiring blade contacts
• Inspections where the non-rotating spindle avoids groove interference

FAQ – Outside blade micrometer

What is an outside blade micrometer?
It is a measuring instrument designed for checking dimensions on external grooves and slotted shafts through dedicated blade-shaped measuring contacts.

What is an outside blade micrometer used for?
It is used for dimensional inspections on components with external grooves and slotted profiles where a standard outside micrometer cannot provide the same functionality.

Why does this micrometer use blade contacts?
The blade contacts allow the instrument to adapt more correctly to the geometry being measured. This is the feature that makes it suitable for grooves and slotted shafts.

Why is the non-rotating spindle important in this type of micrometer?
The non-rotating spindle prevents interference with the groove or slot during advancement. This makes the measurement more suitable for the geometry of the component.

What is the difference between this instrument and a standard outside micrometer?
The main difference is both the application and the geometry of the measuring surfaces. A standard outside micrometer is intended for generic external dimensions, while this model is designed specifically for grooves and slotted shafts.

Is this micrometer suitable for slotted shafts?
Yes, it is specifically designed for this type of application. The blade contacts and the non-rotating spindle make it suitable for dimensional inspections on slotted shafts and similar components.

Can it also be used for external grooves?
Yes, it is intended for measurements on external grooves and all applications where the workpiece geometry requires different measuring contacts compared to standard micrometers.

What resolution does this micrometer have?
This instrument has a 0.01 mm resolution and is therefore suitable for hundredths dimensional inspections in mechanical applications.

What is the purpose of the hardened and ground micrometer screw?
It is an important component because it contributes to smooth movement and measurement quality during inspections.

How is an outside blade micrometer used?
The micrometer is positioned on the area to be inspected, then the contacts are brought into correct contact with the workpiece and the measured value is read. Clean surfaces and correct positioning are important for reliable measurements.

Which measuring ranges are available?
The available range covers 0-25 mm up to 75-100 mm, with 25 mm measuring steps.

Who is this micrometer intended for?
It is intended for mechanical workshops, tool rooms, production departments and quality control applications working on components with external grooves and slotted shafts.

What are the most common mistakes when using an outside blade micrometer?
The most common mistakes are incorrect contact positioning, dirty surfaces, unsuitable measuring range selection and improper contact management during inspection.