The Phas-Lok from Zero-Max simplifies changing the phase relationship of a drive component and the shaft. Designed to reduce system downtime, the devices eliminate the need to disconnect or remove drive components in order to reposition or re-synchronize the components. They provide an accurate, mechanical adjustment with a 24° range (±12°) and compensate for required timing changes in a power transmission system. 
When mounted in a system, the Phas-Lok acts as a dependable position control device. It’s ideal for fine tuning timing adjustments including adjusting for chain elongation and sprocket tooth wear.
The Phas-Lok locks tightly and will not slip or loosen during equipment start up and shut down. Phase adjustment can be made quickly on the machine with accuracy using ordinary hand tools. No system disassembly is needed to make the phasing change.
The Phas-Lok is available in three sizes with bores ranging from 0.5 in. to 2.5 in and also comes in metric bore sizes and with a variety of split taper bushings.
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