Starrett 52507 Blade Micrometer 4 to 5 Inches

Product Description

The STARRETT 52507 is a mechanical blade micrometer designed for measuring in narrow slots, grooves, and recessed areas where a standard micrometer anvil cannot reach. It covers a measurement range of 4.0000 to 5.0000 inches with a graduation of 0.0010 inches, providing precise readings in tight-clearance applications. The speeder thimble allows for rapid spindle travel, reducing setup time during repetitive measurements. Both the anvil and spindle are constructed of rigid steel with a satin chrome finish for corrosion resistance and long service life. A wrench is included for lock nut adjustment. This tool is used by machinists, tool-and-die technicians, and precision measurement professionals.

The 52507 is suited for dimensional inspection tasks where blade-style contact geometry is required, such as measuring keyway widths, narrow grooves, and recessed shoulders on machined components. The blade thickness of 1/32 inches (0.79 mm) and blade depth of 5/16 inches (7.94 mm) allow access into confined geometry that standard outside micrometers cannot accommodate. The spindle diameter is 1/4 inches (6.35 mm). This micrometer is appropriate for both shop-floor use and quality control inspection in manufacturing and maintenance environments.

Key Features

• Measurement range of 4.0000 to 5.0000 inches with 0.0010-inch graduation
• Speeder thimble for rapid, easy spindle adjustment
• Blade thickness of 1/32 inches enables access into narrow slots and grooves
• Rigid steel anvil and spindle with satin chrome finish for durability
• Non-rotating spindle design maintains consistent blade orientation during measurement
• Includes wrench for lock nut adjustment

Compatibility

Designed as a standard outside blade micrometer for precision measurement applications requiring access to narrow or recessed features in the 4 to 5 inch range.

Installation Notes

Blade micrometers should be handled and stored carefully to protect the blade anvil geometry from damage. Before use, verify the zero calibration at the reference standard appropriate for the measurement range. Clean contact surfaces prior to measurement to prevent debris from affecting readings. Calibration and adjustment should be performed by a qualified metrologist or toolroom technician following the manufacturer's procedure.