Starrett 52505 Blade Micrometer 3 to 4 Inches

Product Description

The STARRETT 52505 is a mechanical blade micrometer designed for measuring in narrow slots, grooves, keyways, and other tight-clearance areas where a standard micrometer anvil cannot reach. The blade-style anvil and spindle measure a range of 3 to 4 inches with a graduation of 0.001 inches, giving technicians and machinists precise readings in confined geometry. The blade thickness is 1/32 inches and the blade depth is 5/16 inches, allowing access to features that would block a conventional instrument. The satin chrome finish reduces glare in shop environments. A speeder thimble enables quick spindle travel for faster setup during repetitive measurement tasks.

This micrometer is suited for precision metrology work in machine shops, toolrooms, and manufacturing environments. It is used by machinists, tool and die makers, and quality control technicians who need to verify dimensions in recessed or narrow features. The 3 to 4 inch range covers a common mid-size workpiece class. A wrench is included for lock nut adjustment. The rigid steel anvil and spindle maintain measurement integrity under normal shop conditions.

Key Features

• Blade thickness of 1/32 inches allows measurement in narrow slots and grooves
• Blade depth of 5/16 inches provides reach into recessed features
• Speeder thimble enables rapid spindle travel for faster measurements
• Graduation of 0.001 inches for precise mechanical readout
• Satin chrome finish reduces glare and resists corrosion in shop use
• Wrench included for lock nut and adjustment service

Compatibility

Designed as a direct-use precision measuring instrument for any application requiring a 3 to 4 inch blade micrometer with mechanical readout. No specific OEM replacement compatibility is stated for this item.

Installation Notes

This instrument requires no installation. Before use, clean the blade anvil and spindle faces with a lint-free cloth to ensure accurate contact. Calibrate against a known standard or gauge block before performing critical measurements. Store in the provided case when not in use to protect the blades from damage and maintain calibration integrity.