Part number S70MD251 is an AS568-251 red Silicone 70 Shore A O-Ring with an inside diameter of 5.109 in (129.77 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.387 in (136.83 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.
The compound resists weathering, ozone and UV exposure, and extreme heat and cold. That behavior comes from the compound itself: Silicone is widely chosen for an exceptionally wide service temperature range, physiological inertness and low toxicity. The material carries a published service range of -80°F (-62.2°C) to 450°F (232.2°C). Verify compatibility before use with concentrated acids or abrasive dynamic service.
The compound is metal detectable for HACCP and foreign-body control programs. Common environments for this compound include electronics and electrical enclosures, pharmaceutical manufacturing, and ovens and heated equipment.
Order part number S70MD251, sold individually. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description -251 RED SILICONE 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 5.109 inch (129.77 mm)
Actual Outside Diameter 5.387 inch (136.83 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable