The TST116SO is an AS568-116 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 0.737 in (18.72 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.943 in (23.95 mm). This back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
As a material, PTFE (Teflon) is specified for a very wide continuous service temperature range and excellent dielectric properties. It resists nearly all industrial chemicals, steam, and solvents. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C).
Maintenance and OEM teams specify it across chemical processing, aggressive-media pipelines, and food and beverage.
Order part number TST116SO, sold individually. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description *116 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 0.737 inch (18.72 mm)
Actual Outside Diameter 0.943 inch (23.95 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings