Castor Types
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INDUSTRIAL CASTORS In the main plate fitting. It is a rule of thumb (though exceptions do occur) that castors up to 125mm – so 80mm 100mm and 125mm will have rectangular top plates, 105 x 80 with 80 x 60 slotted bolt hole centres. 160mm, 200mm and occasionally 250mm will have 130 x 106mm top plates. Can differ slightly but bolt hole spacings are constant at 105 x 80 slotted bolt hole centres. Industrial castors are also available in bolt hole fitting. Again, generally M12 especially in 80mm, 100mm and 125mm. Also in 150/160mm but these are also available in M16 and M20. All industrial castors, plate and bolt hole come in swivel and swivel braked and in plate fixed but you can’t have fixed in bolt hole fitting.
INSTITUTIONAL CASTORS
Most institutional castors are 50mm, 75/80mm, 100mm and 125mm. Larger diameters available but are rare. In zinc or chrome finish. Available in bolt hole fitting. Generally M10 or M12. Also plate fitting but, whereas industrial have standard bolt holes, institutional don’t. They are generally smaller plates than industrial but can be all sizes. Bolt hole castors can have solid stems or expanding adaptors. These can be round or square, round being most popular. In 19mm and 22mm. Castors are available with combined swivel and wheel brakes (brakes the head of the castor as well as the wheel). Directional locks, which turns a swivel castor into a fixed castor.
MEDICAL CASTORS
Many of the medical castors cross over with institutional but are nearly always chrome. But the main medical castors are now with glass filled nylon forks, some with stainless steel parts and some not. Polyurethane tyred twin wheel castors fall into this category mainly for patient lifters. Brakes and locking systems more or less as institutional but with an added three way locking system. Used mainly on hospital beds.