Starrett 579D 1-1/4 to 2-1/8 in (32-54 mm) Telescoping Gage

The Starrett 579D is a telescoping gage with a stated range of 1-1/4 to 2-1/8 in (32-54 mm) and a 2-3/8 in (60 mm) handle. It is used to find the true size of holes, slots and recesses by transferring the dimension to a micrometer.

Per the manufacturer, the ends of both contacts are hardened and ground to a radius to give clearance in the smallest hole the gage will enter, and constant spring tension gives uniform contact pressure. Both plungers lock at any setting, and the handle is rigidly attached to the contact plungers and self-centering. The final hole size is taken by measuring over the contacts with a micrometer (not included). Sold as a single gage.

Features

• Range 1-1/4 to 2-1/8 in (32-54 mm), 2-3/8 in (60 mm) handle
• Two telescoping contacts
• Contact ends hardened and ground to a radius, per the manufacturer
• Precision ground radius on each contact gives two-point contact
• Constant spring tension for uniform contact pressure
• Both plungers lock at any desired setting
• Handle rigidly attached to the plungers and self-centering
• Final size read by measuring over the contacts with a micrometer (not included)

Specifications

Part numbers

Documents

• Manufacturer data sheet