Sizes of O-Rings and Material
O-rings are perhaps the most common
component used in sealing applications. From
the design of machineries to production, its
use is extensively found in household
appliances, hydraulic and pneumatic
cylinders, heavy equipment, mining and
agricultural, pharmaceuticals and drugs as
well as oil and gas and aerospace
The cross sectional area diameter along with
its internal diameter define the size of an
o-ring. Accuracy is important in the choice
of an o-ring, and upon installation, the
o-ring should fit within close tolerance
inside the groove of the mounting. The
contact area between the mounting and the
o-ring should facilitate an even
distribution of pressure throughout, and for
that to happen, it is critical for the
contact surface of the mounting to be even.
The fluid pressure that is contained should
not exceed the pressure along the contact
surface between the o-ring and the surface
of the mounting under compression. This is
necessary for the prevention of fluid
leakage and maintaining the integrity of the
seal. The design criteria of the seal should
take into consideration the size and shape
of the mounting along with an accurate size
selection for the o-ring. An o-ring size
that is incompatible with the mounting will
compromise the integrity of the seal.
O-rings and seals are designed to perform
within expectations under harsh conditions
such as temperature extremes and aggressive
chemical media. Production downtime, cost to
the environment as well as factory safety
are some of the results of design failure.
Rubber Industrial Co., Ltd.
No. 15, Kung Yeh East 4th Rd., Lukang, Chang Hua 505, Taiwan, R.O.C.
Mao Rubber Industrial Co., Ltd. All rights reserved.