A, O-ring standard: The following is GB GB3452.1-92 the standard O-ring inner diameter size * diameter (1.78-133.07 * 1.78MM) O-ring inner diameter size * diameter (1.24-247.32 * 2.62MM) O-ring inner diameter size * diameter (4.34-456.06 * 3.53MM) O-ring inner diameter size * diameter (10.46-557.61 * 5.33MM) O-ring inner diameter size * diameter (113.67-557.66 * 6.99MM) O type * Size inner diameter circle diameter (24.4-144.4 * 3.1MM) O-ring inner diameter size * diameter (149.3-299.3 * 5.7MM) O-ring inner diameter size * diameter (149.5-399.5 * 8.4MM) O-ring Specifications inner diameter * diameter (0.8-500 * 0.5-1MM) O-ring inner diameter * diameter specifications (1-2000 * 1-15MM) two, O-ring performance: Dimensions: Diameter (without limitation) * diameter (Any ) * diameter (0.3-20mm) Shape: O type, O-shaped, round Color: is black, can also produce green, red and other colors, or color number according to custom Hardness: 30-90 Shore A three's, O-ring Specifications: O-ring specifications Model main UHSO ring size, UHPO ring size, UNO-ring specifications, DHO-ring specifications, rod O-ring specification, high temperature O-ring, high pressure O-ring, corrosion-resistant O-ring, wear-resistant O-ring. Four, O-ring standard: There GB GB 1235-76, GB GB3452.1-92; JIS P TYPE, G TYPE, S TYPE, SS / V TYPE, F TYPE; US standard AS568, British standard series; European standard series. Five, O-ring (O-type rubber seals) Installation Notes: 1. Install the O-ring (O-type rubber seals) requirements before installing O-ring (O-type rubber seals), check the following items : whether the introduction of angular drawings whether sharp edges chamfered or rounded; inner diameter of whether deburring surface pollution; whether seals and parts have been applied grease or lubricant fluid (to ensure media compatibility with elastomers recommended The seal liquid to lubricate); do not use greases containing solid additives such as molybdenum disulfide, zinc sulfide. 2. Manually install O-ring (O-type rubber seals): Use no sharp edges of tools; to ensure O-ring (O-type rubber seals) do not distort, stretch O-ring may not be excessive (O-type rubber seals) ; to make use of aids to install the O-ring (O-type rubber seals), and to ensure correct positioning; the adhesive sealing strip into the O-ring (O-type rubber seals) can not be stretched at the junction. 3. mounting screws, splines: When the O-ring when (O-type rubber seals) stretch, through screws, splines, keyways, you must use the installation mandrel. The mandrel may be relatively soft, smooth metal or plastic, without burrs or sharp edges. When you install the compression screw, tighten the screws should be symmetrical, in the direction of the order shall be tightened.