Next Generation Skwezloc
Concentric Locking Clamp for Improved Lock Reliability
Originally designed and patented in 1966, Sealmaster® SKWEZLOC® the concentric lock has become the standard in concentric locking and has been redesigned* to accommodate “commercial” grade turned & polished (T&P) shaft tolerances. This new design also provides improved lock reliability on the turned ground & polished (T&P) shaft tolerances.
SKWEZLOC concentric locking collar clamp design results in near-perfect concentricity of the shaft-to-bearing bore and maintains near-perfect ball path roundness while reducing fretting corrosion. This design eliminates the shaft damage of setscrew locking and minimizes bearing induced vibration for smoother quieter operation. The collar has a TORX Plus® head cap screw that outlasts stripping 12 times longer than hex head cap screws.
Find the right parts for your application based on: dimension, power, speed, service factor as well as other environmental conditions.
New Design Features
- Innovative circumferential groove on the inner ring bore that improves shaft grip and reduces raceway distortion for quieter smoother operation allowing for improved lock reliability.
- Larger cap screw and collar for improved clamping force to the shaft.
- Designed for use on “commercial” T&P shafting**, potential user cost reduction on shafting by specifying “commercial” tolerances.
- Same simple single screw installation, no axial movement during installation or risk of preloading the bearing which is concerns when using an adapter lock design.
- Patent-pending design.
Notes:
* No change to part numbers; this will be rolling implementation.
** Maximum speed rating on commercial (T&P) shafting to setscrew locking; consul bearing catalog.
| SHAFT DIAMETER |
OLD TOLARANCE RANGE TURNED, GROUND & POLISHED (TG&P) |
NEW TOLARANCE RANGE** COMMERCIAL SHAFTING / TURNED & POLISHED (T&P) |
|---|---|---|
| 1/2" to 2" | +.0000 / -.0005" | +.000 / -.003" |
| 2 1/8" to 2 7/16" | +.0000 / -.0010" | +.000 / -.004" |
Notes: all values exceed the axial load capacity of the bearing
* In laboratory axial push off testing for 1 7/16”, the next-generation design resulted in:
- 85% holding force improvement on turned, ground & polish Shafting vs old design;
- 59% holding force improvement on turned, ground & polish Shafting vs leading competitor; and
- 113% holding force improvement on turned & polish shafting vs leading competitor.
- CIRCUMFERENTIAL GROOVE increases inner ring elasticity to improve grip (clamping force) on “undersized” commercial shafting without increasing deformation to inner ring ball path.
- LARGER COLLAR & SCREW increase grip and holding power.
- OPTIMIZED CHAMFER PROFILE reduces stress concentrations when the collar is tightened.
FEA Modeling of Installed Inner Ring
