# of
Flanges: Describes the number of flanges on a pulley. Most will
have two flanges, to keep the belt from slipping, but some operations work best
without any flanges. The rare product with only 1 flange is recommended for
Genuine OEM replacement only.
Back
Side Offset: The width from the center of the pulley to the backside edge
of the hub or bore adapter.
Bearing
ID: The
inside diameter of the bearing used in the pulley. This is useful for
determining if a bore adapter can be added, and if so, which sizes will fit.
Finish: The finishing
material used to prevent rusting in steel or cast iron products. Zinc Plating
and powder coat provide the best rust prevention.
Flange
Angle: The
angle of the flanges on flat idlers. Presented either as 90 degrees to
reference perpendicular flanges, or in degrees away from perpendicular.
Generally, wider angled flanges can decrease wear on your belt.
Flat
Diameter: The diameter from side to side of the circle of the pulley.
This is the diameter where your belt will ride.
Flat
Width: The
distance from side to side of the flat of the pulley. This is the width where
your belt will ride.
Frontside
Offset: The width from the center of the product to the front edge
of the hub, bearing, or bore adapter.
Inside
Diameter: The distance across the center hole, or bore, of the
product. This dimension should match the diameter of your shaft or bolt.
Material: Describes what the
product is made from. Plastic, aluminum, and diecast are softer, lighter, and
do not rust. Steel and cast iron are meant for heavy-duty applications, but can
rust in certain circumstances.
Material
Thickness: Refers to the thickness of steel products only. This helps
determine the overall sturdiness of the part. For Idler Pulleys, material
thickness greater than 0.07” is considered Heavy Duty. For Drive Pulleys,
thickness of 0.14” or greater is Heavy Duty.
Outside
Diameter: The distance across the circle of the product, from outside
edge to outside edge.
Stickout: The distance from
the edge of the pulley’s flange to the edge of the bore adapter or hub. This is
easiest to measure if the pulley is placed hub down on a flat surface. The
stickout will be the space between the surface and the outside edge of the
pulley. A negative stickout means that the pulley will lie flat on a surface
with no gap.
Throughbore: Length of the bore,
from one edge to the other. The Frontside Offset and Backside
offset together equal the length of the throughbore.
Width: The distance from
side to side of the pulley, across the area where the belt rides
For
information on how to best measure your pulley, see our How to
Measure Your Pulley page or contact us at [email protected]
