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Precision Coaxial Indicators for Fast, Accurate Centering
The Blake Coaxial Indicator provides a fast and reliable method for centering a workpiece or fixture on milling machines, lathes, EDM equipment, and other machine tools. Designed for both internal and external diameters, the Blake Co-Ax Indicator allows machinists to quickly locate true center while the spindle rotates under power.
With final manufacturing and assembly in the USA, Blake coaxial indicators are trusted throughout the machining industry for their durability, repeatability, and ease of use. Whether aligning bores, locating bosses, or setting up precision machining operations, the Blake Coaxial Indicator simplifies spindle alignment and reduces setup time.
Why Use a Blake Coaxial Indicator?
The Blake Co-Ax Indicator helps operators achieve accurate centering without complicated setups or time-consuming indicating procedures.
Key Benefits
The stationary dial face remains readable while the spindle rotates, allowing the operator to observe indicator movement and make coordinated machine table adjustments with both hands free.
Applications
Blake Coaxial Indicators are commonly used for:
How the Coaxial Indicator Works
The Blake Co-Ax Indicator operates as a centering device that measures offset from the spindle centerline. As the spindle rotates, the indicator hand movement decreases as alignment improves. When the indicator hand remains stationary, the workpiece is aligned with the spindle axis.
The indicator can be used with straight or curved feelers depending on internal or external diameter applications.
Built for Precision Machining
Blake Manufacturing has been producing precision centering instruments used in machine shops, tool rooms, and manufacturing facilities for decades. The Blake 801 Coaxial Indicator is recognized throughout the machining industry for dependable performance and long service life.
Learn More

The graduation increments changes based on the feeler length and workpiece diameter size as listed in above chart.
The Blake COAXIAL INDICATOR is a centering device. It requires a reading of both sides of the bore or boss in each axis, to arrive at the center. Its sole function is to find center. It is NEVER to be used as a measuring instrument.
You cannot certify the COAXIAL INDICATOR on a surface plate. It must be put in a spindle of a machine that it would normally be used in and indicate a precision ring or plug. Then remove it and use a .0001 indicator to check that your are on center.
The CO-AX INDICATOR is made to be used under power. When checking the CO-AX position with a test indicator, the spindle should be rotated manually for both indicators due to the fact that spindle torque under power on some machines will give a different reading for center.
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