Starrett 64640 Caliper Depth Attachment Dial Caliper

Product Description

The STARRETT 64640 is a caliper depth attachment designed to extend the measurement capability of compatible Starrett dial calipers. The attachment mounts to the caliper jaw area and allows technicians to measure depth dimensions that standard caliper jaws cannot reach. Constructed from stainless steel with a satin chrome finish, the 64640 is built for shop floor durability and corrosion resistance. It ships as a single piece and includes the mounting screw required for installation. Machinists, tool-and-die makers, and precision measurement technicians working in manufacturing, fabrication, or maintenance environments are the primary users of this accessory.

This depth attachment is intended for use with 6 inch, 9 inch, and 150mm Starrett 120 and 120M Series dial calipers. It is part of the broader 798-799-797-120-1202 accessory series, making it a direct fit for those specific instrument families. Typical applications include measuring bore depths, slot depths, and step heights in metal, plastic, or composite workpieces where a standard depth micrometer is not practical and the existing dial caliper is already on hand.

Key Features

• Stainless steel construction with satin chrome finish for corrosion resistance and durability
• Compatible with 6 inch, 9 inch, and 150mm 120 and 120M Series Starrett dial calipers
• Includes mounting screw — no additional hardware required
• Single-piece accessory for straightforward installation and removal
• Part of the 798-799-797-120-1202 accessory series for verified instrument fitment

Compatibility

Designed for use with Starrett 6 inch, 9 inch, and 150mm 120 and 120M Series dial calipers within the 798-799-797-120-1202 accessory series.

Installation Notes

Installation is performed by machinists or calibration technicians familiar with precision measuring instruments. Before attaching or removing the depth attachment, ensure the caliper is clean and free of chips or debris that could affect seating. Use only the included screw and do not overtighten, as excess torque can distort the caliper beam or attachment body and compromise measurement accuracy. Follow the instrument manufacturer guidelines for any recalibration or zeroing procedure after the attachment is fitted.