Fowler 52-225-110-0 Mechanical Depth Micrometer 4 in 4 Rod

Product Description

The FOWLER 52-225-110-0 is a mechanical depth micrometer built for precise depth measurement in machine shop, toolroom, and general metrology applications. It features a 4-inch maximum measurement range with 0.001-inch graduation and an accuracy of 0.0002 inches, making it suitable for high-tolerance work. The ratchet stop thimble provides consistent measuring force, reducing operator-to-operator variation. The 2.5-inch base length offers a stable reference surface that is hardened and ground for flat, repeatable contact. Four interchangeable rotating rods are included, allowing the tech to cover the full measurement range. The satin chrome finish minimizes glare under shop lighting. Total weight is 1.9 pounds.

This depth micrometer is used wherever accurate hole, slot, recess, or step depth must be verified or recorded. It is a standard instrument in precision machining, manufacturing quality control, and tooling setups. Licensed machinists, metrology technicians, and skilled trades professionals working to tight dimensional tolerances will find it appropriate for both production floor and inspection bench use. The included hardened case protects the instrument and rods during storage and transport between job sites or inspection stations.

Key Features

• 4-inch maximum measurement range with four interchangeable rotating rods
• 0.001-inch graduation for fine resolution on close-tolerance work
• Accuracy of 0.0002 inches for reliable, repeatable readings
• Ratchet stop thimble ensures consistent measuring force regardless of operator
• 2.5-inch base length hardened and ground for stable, flat reference contact
• Locking clamp holds the reading during transfer from the workpiece
• Satin chrome finish reduces glare and resists corrosion in shop environments

Compatibility

Designed as a standard mechanical depth micrometer suitable for general-purpose depth measurement tasks in machining, inspection, and toolroom environments. No specific equipment or system compatibility is required beyond a flat reference surface on the workpiece.

Installation Notes

Depth micrometers require no installation but should be zeroed and verified against a known reference standard before use. Store rods in the provided hardened case to prevent damage to the measuring faces. Clean the base and rod contact surfaces before each use to ensure accurate readings. Calibration should be performed at intervals appropriate to the frequency of use and the tolerances of the application.