John Crane Type 1 Replacement Mechanical Seal

The Industry Workhorse, Built for Everyday Reliability

The Type 1 has earned its reputation as an industry workhorse largely because it tolerates the kind of shaft misalignment and end play that trips up more precise seal designs — its drive band absorbs torque without slipping, while the bellows itself flexes to accommodate movement rather than depending on a separately compressed spring alignment. That same forgiving nature is why plants stock it across such a wide range of general pump duty, from water handling to light process fluids, without needing to chase exact tolerances during a routine changeout. Our equivalent reproduces this fit and behavior precisely, so existing spares, gland plates, and shaft sleeves already in service continue to work without adjustment. If you're setting up a fitting procedure for the first time, our blog covers the full torque sequence and bellows compression steps in detail.