O-Rings
Buna-N, Viton, silicone and EPDM O-rings by AS568 dash number.
Also searched as: o ringsas568viton o ringbuna nnitrile o ring
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O-RING
Dash Number: 014Durometer: 90
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O-Ring
Dash Number: 371Inside Diameter: 8-1/2 inchOutside Diameter: 8-7/8 inchThickness: 3/16 inch
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O-Ring
Dash Number: 110Inside Diameter: 0.3620 inchOutside Diameter: 0.5680 inchThickness: 0.1030 inch
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O-Ring
Dash Number: 006Inside Diameter: 0.1140 inchOutside Diameter: 0.2540 inchThickness: 0.0700 inch
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O-Ring
Dash Number: 246Inside Diameter: 4-1/2 "Outside Diameter: 4-3/4 "Thickness: 1/8 "
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O-Ring
Dash Number: 117Inside Diameter: 0.7990 "Maximum Working Temperature: 450.000 FMinimum Working Temperature: -15 FOutside Diameter: 1.0050 "
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O-Ring
Dash Number: 345Inside Diameter: 4 inchOutside Diameter: 4-3/8 inchThickness: 3/16 inch
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O-Ring
Dash Number: 132Thickness: 3/32 inch
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O-Ring Kit
AS568 Dash Numbers: 006-012, 110-116, 210-222, 325-327Number of Pieces: 382
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O-Ring Kit
Number of Pieces: 382
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O-Ring Kit
Maximum ID: 1.725 "Maximum Working Temperature: 212.000 FMinimum ID: 0.114 "Number of Pieces: 382
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O-Ring: 1/2" ID, 3/32" Thick, Dash 112
Dash Number: 112Inside Diameter: 1/2 inchThickness: 3/32 inch
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O-Ring: 1/2" OD, 3/8" ID, 1/16" Thick, Dash 012
Dash Number: 012Inside Diameter: 3/8 inchOutside Diameter: 1/2 inchThickness: 1/16 inch
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O-Ring: 10.50 mm OD, 8.50 mm ID, 1.00 mm Thick
Inside Diameter: 8.50 mmOutside Diameter: 10.50 mmThickness: 1.00 mm
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O-Ring: 2.6300" OD, 2.4400" ID, 0.0937" Thick, Dash 143
Dash Number: 143Inside Diameter: 2.4400 inchOutside Diameter: 2.6300 inchThickness: 0.0937 inch
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O-Ring: 21.00 mm OD, 16.00 mm ID, 2.50 mm Thick
Inside Diameter: 16.00 mmOutside Diameter: 21.00 mmThickness: 2.50 mm
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O-Ring: 3/8" OD, 1/4" ID, 1/16" Thick, Dash 010
Dash Number: 010Inside Diameter: 1/4 inchOutside Diameter: 3/8 inchThickness: 1/16 inch
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O-Ring: 33.00 mm OD, 27.00 mm ID, 3.00 mm Thick
Inside Diameter: 27.00 mmOutside Diameter: 33.00 mmThickness: 3.00 mm
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O-Ring: 72.00 mm OD, 62.00 mm ID, 5.00 mm Thick
Inside Diameter: 62.00 mmOutside Diameter: 72.00 mmThickness: 5.00 mm
About o-rings
O-rings are toroidal seals, typically circular in cross-section, designed to be seated in a groove and compressed during assembly to create a seal between two or more parts. They are critical components in static and dynamic sealing applications across various industries, preventing leakage of fluids or gases. Selection is primarily driven by the application's operating conditions, including temperature, pressure, and chemical compatibility. Standardized dimensions are defined by specifications such as AS568, which specifies inside diameter, cross-sectional diameter, and corresponding dash numbers. Common materials include Buna-N (nitrile) for general-purpose applications with good oil and solvent resistance, Viton (FKM) for high-temperature and aggressive chemical environments, silicone for extreme temperature flexibility and medical applications, and EPDM for excellent resistance to steam, hot water, and brake fluids. Material choice significantly impacts performance characteristics like durometer (hardness), tensile strength, and compression set. The correct O-ring ensures long-term sealing integrity and system reliability.
How to choose
Selecting an O-ring involves a sequential decision process. First, identify the chemical compatibility requirements based on the fluid or gas being sealed; this dictates the base polymer (e.g., Buna-N, Viton, EPDM, Silicone). Second, determine the operating temperature range to ensure the chosen material maintains its sealing properties without degradation or embrittlement. Third, consider the pressure differential across the seal; for high-pressure applications, consider backup rings or harder durometer O-rings to prevent extrusion. Fourth, specify the required dimensions, typically by AS568 dash number, which defines the inside diameter and cross-section. Finally, assess whether the application is static or dynamic, as dynamic seals require materials with lower friction and higher abrasion resistance.