1 Updated: Isorex R310

If you buy one used and it won’t write:

This grid fits into slots machined into the hub flanges. When torque is applied, the grid flexes. This flexing action is not a weakness; it is the engineered mechanism that absorbs the energy spikes common in start-stop machinery. By dampening these shocks, the Isorex R310 1 protects expensive rotating equipment—such as electric motors, gearboxes, and pumps—from premature fatigue and bearing failure. isorex r310 1

The is a refillable technical drawing pen designed for precision drafting on paper or film. It belongs to the “R310” series, which was produced primarily in the 1980s–1990s. The “1” indicates the line width : 0.1 mm (or #0.10), making it an ultra-fine instrument for highly detailed work. If you buy one used and it won’t