Brochure

Mtd. Ball
Bearings
G-245
®
Mounted Ball Bearing Engineering Section
The Concentric
Locking System
Sealmaster Skwezloc
®
and Browning BOA
concentric locking system for ball bearings
has an inner ring extension which is slit into
6 tangs. The split concentric collar is tight-
ened over the inner ring extension, gripping
the bearing to the shaft. The concentric
design friction grips to the shaft with 360° of holding.
• Centers the shaft in the bore of the bearing, reducing
vibration and shaft runout.
• Maintains manufactured ball path roundness reducing
vibration and enhances bearing life.
• Excellent for high speed applications
• Does not mark the shaft like set screw or eccentric
lock.
• Is easy to install, requiring tightening only one Torx
head capscrew.
Concentric is often specied in air handling, HVAC, fan and
blower applications where noise and vibration reduction is
essential. High speed applications such as saws and routers
or high speed spindles are common applications for concen-
tric locking. Coating roll and sanding applications are also
good applications for the concentric where runout control of
the rotating system is essential. Concentric is recommended
for stainless steel or hardened shafting. In vertical shaft or
high thrust load applications, a thrust collar or axial locating
device is required to insure safety of the friction grip lock.
Note: Premium locking systems are not intended to be a x
for worn, damaged or undersized shafting or poor mounting
practices. Consult Installation Instructions for proper instal-
lation.
Lock Types continued
Shaft Lock Comparison
Characteristic Single Lock Double Lock Concentric Eccentric
High Speeds
3 3 3 3 3 3 3 3 3 3 3
Heavy Loads
3 3 3 3 3 3 3 3 3 3 3
Radial Loads
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
Thrust Loads
3 3 3 3 3 3 3 3 3 W 3 W
Fretting Control
3 3 3 3 3 3 3 3 3 3 3
Run out Control
3 3 3 3 3 3 3 3 3 3
Reliability of Lock
3 3 3 3 3 3 3 3 3 3 3 3 3
Vertical Shaft
3 3 3 3 3 3 3 3 3 W 3 W
Eccentric Loads
3 3 3 3 3 3 3 3 3 3
Hardened/Stainless
Shafts
3 3 3 3 3 3 3 3 3 3 3 3
Legend: Excellent 3 3 3 3, Good 3 3 3, Fair 3 3, Poor 3
W Review use of thrust device.
90
000
180
270
Typical Roundness of
Manufactured Bearing
Typical Roundness
of 90° Competitor
Setscrew
90
000180
270
Roundness of
65° Competitor
Setscrews
90
000
180
270
Roundness of
45° Competitor
Setscrews
90
000180
270
Typical Roundness
of Sealmaster and
Browning 120°
Setscrew
000
180
270
90
Roundness of Skwezloc
®
Concentric Lock
Collar and Browning
BOA Bearing with 360°
Locking
270
90
000180