Starrett 53050 Tubular Micrometer 8 Inch Range

Product Description

The STARRETT 53050 is a mechanical tubular micrometer designed for measuring large-diameter workpieces and deep bores beyond the reach of standard outside micrometers. It covers an 8-inch measurement range with a graduation of 0.001 inches and an accuracy of 0.0001 inches, making it a reliable choice for precision inspection work. The friction thimble provides consistent measuring force to protect the workpiece and ensure repeatable readings. Five extension rods with a 3/8-inch diameter are included, each adjustable for length and fitted with hardened and ground anvils. The satin chrome finish resists glare and corrosion in shop environments. Machinists, tool-and-die makers, and quality-control technicians use this instrument for setup and inspection tasks.

The STARRETT 53050 is suited for use in machine shops, manufacturing facilities, and quality-assurance environments where large-range measurements are required. It accommodates a 1/2-inch travel per rod setting, allowing incremental extension across the full 8-inch span. The adjustable rods enable measurement of stepped or varied-diameter features. This tool is appropriate for professional metrology applications where 0.0001-inch accuracy is required and is typically found in environments operating to ASME or ISO dimensional inspection standards.

Key Features

• 8-inch total measurement range for large-bore and large-diameter inspection work
• 0.001-inch graduation with 0.0001-inch accuracy for precise readings
• Friction thimble ensures consistent measuring force and repeatable results
• Five extension rods, each 3/8 inch in diameter, with 1/2-inch travel increments
• Hardened and ground anvils on rods are adjustable for length
• Satin chrome finish reduces glare and provides corrosion resistance

Compatibility

Designed as a standalone tubular micrometer for general precision measurement applications requiring an 8-inch range. Extension rods are 3/8 inch in diameter and intended for use with this instrument as a matched set.

Installation Notes

Tubular micrometers are precision instruments and should be handled and stored per the manufacturer recommendations to maintain calibration. Allow the instrument and workpiece to reach the same ambient temperature before measuring to avoid thermal expansion errors. Verify zero calibration before use and after assembling each rod extension. This instrument requires no power source and should be cleaned with a lint-free cloth; avoid solvents that may damage the finish or markings.