O-Ring, G, Fixing (Cylindrical Surface)
Caution
Product Description
A series of O-rings defined by JIS standards.
[Features]
·It has good sealing performance with self-sealing action despite its simple structure
·Stable sealing performance even under high pressure
·Compact installation space and easy installation
·Sealing is not directional and is possible from both sides
[Applications]
·A JIS standard series for various machines
·This product is for static applications and the material can be selected depending on usage conditions, making it suitable for a wide range of applications
Drawing
Drawing 1
Drawing 2
Product Specification
This synthetic rubber ring was made for the purpose of sealing liquid and gases in reciprocating motion or fixed areas
Specifications Table
unit: mm
| Nominal number | O-ring actual size | Groove section dimensions | Groove section dimensions | Reference | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shaft diameter d | Reference | Hole diameter D | Reference | G (0 to +0.25) | R | E | Squeeze | ||||||||||||||
| d2 | d1 | Fitting symbol equivalent to tolerances of d | Fitting symbol equivalent to tolerances of D | No backup ring | 1 pc. backup ring | 2 pcs. backup rings | Maximum | Maximum | mm | % | |||||||||||
| Maximum | Minimum | Maximum | Minimum | ||||||||||||||||||
| *G3 | 3.1 | +/- 0.10 | 2.4 | +/- 0.14 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| *G4 | 3.4 | +/- 0.14 | |||||||||||||||||||
| *G5 | 4.4 | +/- 0.15 | |||||||||||||||||||
| *G6 | 5.4 | +/- 0.15 | |||||||||||||||||||
| *G7 | 6.4 | +/- 0.16 | |||||||||||||||||||
| *G8 | 7.4 | +/- 0.16 | |||||||||||||||||||
| *G9 | 8.4 | +/- 0.17 | |||||||||||||||||||
| *G10 | 9.4 | +/- 0.17 | |||||||||||||||||||
| *G11 | 10.4 | +/- 0.18 | |||||||||||||||||||
| *G12 | 11.4 | +/- 0.18 | |||||||||||||||||||
| *G13 | 12.4 | +/- 0.19 | |||||||||||||||||||
| *G14 | 13.4 | +/- 0.19 | |||||||||||||||||||
| *G15 | 14.4 | +/- 0.20 | |||||||||||||||||||
* Mark indicates the outer dimension of the JIS standard.
Product Feature Details
- The sealing function is enabled by the stress generated when this product is installed to the groove and compressed moderately.
- This product is easier to install than any other packing, takes up less space, and can be done the same way by anyone, and its self-sealing action provides stable sealing performance even under high pressure using only an O-ring.
- It can be installed with a small amount of compression (squeeze) and has relatively low kinetic frictional resistance for higher efficiency.
- It does not cause overtightening of nuts when used for fixing.
Principle of action
Fig. 1: When an O-ring seals a fluid with no or low pressure, the seal is maintained by a squeeze equivalent to a percentage of the cross-sectional diameter of the O-ring.
Fig. 2: As shown in the figure, when the pressure of the fluid increases, the squeezed O-ring in the groove seals by self-sealing action, being pushed from the pressure side and leaning to one side.
Fig. 3: If the pressure increases further and exceeds 10 MPa, the softness of the rubber will cause the O-ring to be damaged by protruding into the clearance.
Fig. 4: To prevent this, leather or fluoropolymer backup rings are attached to both sides of the O-ring when the pressure is on the opposite side or both sides of the pressure direction.
Cautions and Prohibitions
Cautions
- The dynamic O-ring smooths the sliding metal surface finish. (It should be about 1.5S.) The inside of the groove should be about 3S.
- If the reciprocating sliding surface has holes, etc., take care to protect them.
- Do not use more than 2 O-rings in the same location.
- Pay attention to the groove design.
- If the O-ring breaks down, it will suddenly leak and cause an accident, so be sure to replace it at the end of its useful life for dynamic applications.
- Due to its rubbery nature, it will age in the air, so care must be taken when storing it.