S70MD389 is an AS568-389 red Silicone 70 Shore A O-Ring measuring an inside diameter of 19.953 in (506.81 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 20.373 in (517.47 mm). In service, this o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.
Silicone is specified here for exceptionally wide service temperature range and very good compression set resistance across its range. It resists many oxidizing chemicals, weathering, and extreme heat and cold. Continuous operating temperature is published at -80°F (-62.2°C) to 450°F (232.2°C).
This o-ring is metal detectable for HACCP and foreign-body control programs. Maintenance and OEM teams specify it across ovens and heated equipment, sanitary process lines, and medical devices.
Order part number S70MD389, sold individually. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description -389 RED SILICONE 70D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 19.953 inch (506.81 mm)
Actual Outside Diameter 20.373 inch (517.47 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable