Hardware, Oils and consumables

'O' RINGS

We carry a range of rubber 'O' rings other than those with specific TR applications (which can be ordered by original part number).As with nuts and bolts, our 'O' ring range is numbered to indicate the seal size as follows. The sequence is prefixed OR. The first number indicates the measuring system 1 = English, 2 = metric. The second number is the inside diameter in whole inches. The third and fourth numbers are the remainder of the inside diameter in 1/6ths of an inch (second, third and fourth numbers in mm for metric). The fifth, sixth and seventh numbers are the diameter of the cross section in thousands of an inch (0.1mm for metric). The last number is reserved for special applications.