External diameter
Measure the outside diameter of shafts, pins and other cylindrical components between the anvil and spindle measuring faces.
Precision Gages · Mahr
Micrometers
Select Mahr outside micrometers for shaft diameters, component thickness and other accessible external dimensions. Compare mechanical, digital, data-output and wireless models by range and inspection workflow.
What can you measure?
Material thickness
Measure thickness between accessible opposing surfaces using the specified measuring force. Select the contact geometry to suit the material and feature.
Width between parallel faces
Measure external widths and shoulder thicknesses where the measuring faces can seat correctly. Choose the individual micrometer range that covers the dimension.
Explore the product family
Models and measurement options
| Model / option | Range or configuration | Selection notes |
|---|---|---|
| 40 A | 0–25 / 25–50 / 50–75 / 75–100 mm | Mechanical micrometer; 0.01 mm graduation. |
| 40 ER | 0–25 mm | Digital outside micrometer. |
| 40 EWR / 40 EWR-L | Four ranges covering 0–100 mm | EWR-L variants are listed with data output. |
| 40 EWRi | Four ranges covering 0–100 mm | Integrated Wireless variants. |
| 40 F | 0–25 / 25–50 mm | Dial micrometer. |
| 40 EWR-V / 40 EWRi-V | 0–25 mm | Special variants; EWRi-V is listed as a set with accessory kit. Select against the application. |
| MarTool 40 E / 40 EW | Four ranges covering 0–100 mm | 0.001 mm resolution; 40 E: IP40, 40 EW: IP65. Error limit 2 µm for 0–25/25–50 mm and 3 µm for 50–75/75–100 mm. |
Ranges refer to specific variants or sets. Confirm the exact model, configuration and accessories with your quotation. Display resolution is not a statement of measurement accuracy.
What to consider before choosing
Range
Select the individual 25 mm range required; 0–100 mm coverage uses multiple instruments.
Environment
The brochure distinguishes IP40 for MarTool 40 E and IP65 for 40 EW. Do not apply one model’s protection rating to the whole family.
Measuring contact
Check part shape, contact access and measuring force before selecting a standard or special variant.
Frequently asked questions
Which micrometer ranges do I need for components up to 100 mm?
The listed outside micrometers use separate 0–25, 25–50, 50–75 and 75–100 mm ranges. Select the ranges your parts actually require, or request a quotation covering all four. A single 0–25 mm micrometer does not cover the full 100 mm span.
What is the difference between MarTool 40 E and 40 EW?
The supplied brochure lists both with 0.001 mm resolution. The 40 E has IP40 protection and the 40 EW has IP65 protection. Choose against the workshop conditions and confirm the error limit for the required measuring range.
Can a standard outside micrometer measure threads or internal diameters?
Standard outside micrometers are intended for accessible external dimensions. Thread measurement needs suitable measuring contacts, while bores need an inside micrometer or bore-gauging arrangement. Send the feature drawing when the contact geometry is unusual.
Start with your component
Discuss micrometers
Minimum and maximum diameter or thickness, tolerance, contact geometry, quantity and data needs.
Model availability, accessories and lead time are confirmed with the quotation.
Range references: . Manufacturer-listed systems and options are subject to India availability and configuration confirmation.
Product photographs: Mahr. Images illustrate product families; supplied equipment and accessories depend on the selected configuration.