TFE249 is an AS568-249 white PTFE (Teflon) 55 Shore D O-Ring measuring an inside diameter of 4.859 in (123.42 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.137 in (130.48 mm). In service, this o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.
It resists strong acids and bases, nearly all industrial chemicals, and steam. That behavior comes from the compound itself: PTFE (Teflon) is specified for one of the lowest coefficients of friction of any solid and near-universal chemical inertness. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Exposure to molten alkali metals or service requiring elastic recovery will shorten service life.
Maintenance and OEM teams specify it across chemical processing, aggressive-media pipelines, and semiconductor fabrication.
Order part number TFE249, sold individually. Nominal inside diameter is listed as 4 7/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description 568-249 PTFE ORINGS FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 4.859 inch (123.42 mm)
Actual Outside Diameter 5.137 inch (130.48 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Premium