Spi CMS160726112 Screw Thread Micrometer 3 to 4 Inches

Product Description

The SPI CMS160726112 is a mechanical screw thread micrometer designed for precision measurement of threaded workpieces in the 3.0000 to 4.0000 inch range. It features a ratchet stop thimble that delivers consistent measuring force and helps eliminate operator-induced error. Graduation is 0.001 inches with an accuracy of plus or minus 0.0002 inches, making it well suited for quality control and inspection work where tight tolerances are required. The micrometer ships NIST traceable with a short-form certificate of calibration included. A painted finish provides corrosion resistance in shop environments. Machinists, metrologists, and QC inspectors are the primary users of this instrument.

This micrometer is used in precision machining, thread inspection, and quality assurance applications where screw thread form and pitch diameter must be verified within close tolerances. The interchangeable anvil design allows the same frame to be configured for multiple thread forms and pitch ranges, increasing versatility across a tool crib or inspection department. It is appropriate for both production floor use and controlled metrology environments. The included case protects the instrument during storage and transport between job sites or inspection stations.

Key Features

• Measurement range: 3.0000 to 4.0000 inches
• Graduation of 0.001 inches with accuracy of plus or minus 0.0002 inches
• Ratchet stop thimble for repeatable, consistent measuring force
• Interchangeable anvils for flexibility across thread forms and pitches
• NIST traceable calibration with short-form certificate of calibration included
• Includes protective carrying case and standards

Compatibility

Designed as an OEM-style precision measuring instrument for mechanical screw thread inspection applications in the 3 to 4 inch range; verify anvil compatibility with the specific thread form and pitch before use.

Installation Notes

This instrument is a handheld precision measuring tool, not an installed component. Handle with clean, dry hands or cotton inspection gloves to prevent thermal expansion from body heat affecting readings. Store in the included case when not in use and keep away from magnetic fields, extreme temperatures, and abrasive environments. Calibration should be verified against known standards before use in a critical inspection process, consistent with ISO 9001 and similar quality system requirements.