Abstract: An improved industrial chair having a mechanism for adjusting the position of a support column in relation to a fixed platform, such as a chair base portion. The chair comprises a support column having an exterior surface with a plurality of engaging surfaces arranged along the length of the column for selectively engaging portions of a coupling. The coupling is shaped for selectively engaging the support column and positioning the support column relative to the fixed platform. The coupling has an inner surface shaped for contacting the support column engaging surfaces in a substantially matched shape friction fit, and the coupling further has an adjustable circumference structure for permitting selection between locking engagement and relative movement between the support column and the coupling. The chair further has structure suitable for operably retaining the coupling in fixed relation to the support platform.