Frequently asked caster
I ONLY NEED
ONE CASTER. WHY SHOULD I BUY A SET OF FOUR OR FIVE?
wear like tires and should be replaced for a safe and even ride. In addition,
there are slight differences to each caster made by other caster manufacturers.
This difference could also cause an unsafe, uneven ride if all casters are not
replaced at the same time.
HOW DO I KNOW WHAT
CASTER NUMBER TO ORDER? I HAVE A (manufacturers name) CHAIR - I DON'T KNOW STEM
SIZE. CAN YOU TELL ME WHAT TO ORDER? I DON'T HAVE MODEL OF CHAIR. HOW DO I KNOW
WHAT CASTER TO ORDER?
A. CHECK THE CHAIR BASE: Is it metal,
molded, plastic, wood, or a wood clad metal base?
1. If it is a metal or
wood clad base: Most chairs require a 7/16" diameter or 3/8" diameter stem.
These stems have grip rings attached, which hold the casters in place in the
chair base so no sockets are needed. After determining the correct diameter of
a stem, then measure the length. (A stem shorter than your original can always
be used.) CLICK HERE to learn how to measure to determine proper stem size.
2. If it is a wood chair base: All wood chair bases need the same stem caster
with a 5/16" diameter that is called a grip neck stem. A socket is required
with this type of stem to hold the caster in place in the chair base.
the stem is welded to the chair base: We can supply a caster to
accommodate this special situation in both hard and soft wheels. Stems welded
to the base must be 3/8" diameter with a maximum length of 1-5/16".
For a more
detailed answer to this question - Take our 3 step course on choosing the
proper caster - click here.
I JUST BOUGHT A
NEW CHAIR TO BE USED ON A CHAIRMAT AND IT HAS CASTERS WITH HARD WHEELS. I WAS
ADVISED TO CHANGE THE CASTERS TO SOFT WHEEL
Almost all new chairs are equipped with hard
wheel casters unsuitable for use on a chair mat or any hard floor surface.
These wheels should be replaced with soft wheels. Just as tires must have the
proper tread for safe driving on dry pavement as well as slick or snow covered
roadways, chair movement depends on wheels that provide appropriate traction on
hard or soft wheels. Hard wheels are made of nylon, hard rubber, vinyl or some
other hard plastic compound suitable only for carpeting considered a "soft"
floor surface. Soft wheels are soft rubber or soft compound such as urethane
which are resilient and "give" making them grip on hard surfaces such as hard
floors, tile, linoleum and chair mats providing a better and safer
WHAT WHEEL DO YOU USE ON CARPETING,
VINYL, TILE OR HARD FLOORS? WHICH IS THE BEST?
Use hard wheels
for carpeting - with the 60mm or 75mm being best choice for plush carpets.
However, with this variety of floor materials, you should use a soft wheel with
polyurethane tires. The polyurethane tires will work well on the hard floors
and be "slippery" enough not to grab the carpet fibers.
WHY IS WHEEL SELECTION SO IMPORTANT?
wheels that are incorrect for the floor surface can pose risk of serious
injury. Hard floor surfaces require soft wheel casters to prevent dangerously
rapid movement while user is seated or rolling away, when user rises, or when
user bumps empty chair causing it to move out from under user. Muscle strain
can also result due to the users effort to keep chair in place. Hard wheel
casters are necessary for carpeted surfaces as they allow the chair to glide
smoothly over carpeted surfaces. Soft wheel casters used on carpeting can also
cause muscle strain due to the increased difficulty in making the chair move.
WHEN HOLDING A CASTER IN YOUR HAND, HOW CAN
YOU TELL IF IT IS A HARD OR SOFT WHEEL?
You can't tell until you
try to put your fingernail into wheel and see if it "gives". If it does, even
just a little, then it is a soft wheel. A hard wheel will not have any
DOES A ROUND OR FLAT TOP STEM MAKE
No, some caster manufacturers use round tops, some
flat - makes no difference. Correct diameter is the determining factor for
WHAT IS THE PURPOSE OF A GRIP RING
ON METAL BASE CASTER STEMS?
Grip Rings expand when inserted in
chair bases and hold the caster in place inside the base.
POSITION OF GRIP RING OR WIDTH MAKE A DIFFERENCE?
Manufacturers stems vary. Size or placement of grip ring is not a factor. There
is no metal notch in chair leg for them to fit into. They expand once the stem
is securely inserted into the chair base.