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Spool Flange
Belts that run on bare line-shafts usually “walk and wander”, i.e., screw down the shaft and snap back repeatedly. This causes high frequency vibrations that stretch and abrade belts, greatly reducing belt life. Spool flanges prevent walking and thereby increase belt life. Only one flange per belt is needed because belts walk in only one direction – the direction of conveying motion.
Belts vibrating on bare line shaft

Urethane Belt Urethane Spool Flanges are designed for use on powered rollers or other line-shafts that are 1.9” or larger in diameter. Our urethane’s supreme elasticity holds them firmly in place. They stick so tightly to the shaft that RAVE Ultra-Hold hair spray is necessary for installation, and when dry, it acts as a glue that gives added protection against dislodgement. If still more hold is desired, a drop of Loctite 480 will lock them in place, but this is hardly ever needed. Our spool flanges are tapered so that their outside edges do not rub against the belts, and they rotate with the belts so no abrasion occurs. They also provide a little extra drive. Mount them about 5/8” from a line perpendicular to the powered roller and through the driven roller’s axis as shown, or so the belt does not distort when touching the flange nor rub on the outside edge of the flange.
Powered Roller used as a line shaft
with Urethane Spool Flanges

Urethane Belt Split Spool Flanges are designed to fit both 1” and 25 mm line-shafts. They are easily installed without dropping the shafts. Currently awaiting orders large enough to justify the cost of mold tooling.
Split Spool Flanges
for 1" and 25 mm line shafts
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