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143 PTFE SOLID BACKUP RING FDA

PTFE Back-Up Ring, 2.425 in ID x 0.103 CS, 55D, White, -65 to 500°F

Picture of 143 PTFE SOLID BACKUP RING FDA
Status
Available
Est. Ship Date
31 Oct 2026
Material
PTFE (Polytetrafluoroethylene)
Dash Size
143
Durometer
55 Shore D
Cross Section Type
Round
Color
White
Minimum Temperature
-65°F (-53.9°C)
Maximum Temperature
500°F (260°C)
Nominal Cross Section
3/32 inch
Nominal Inside Diameter
2 7/16 inch
Nominal Outside Diameter
2 5/8 inch
Unit of Measure
EA
SKU:
TST143SO
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Product Specification

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The TST143SO is an AS568-143 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 2.425 in (61.6 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.631 in (66.83 mm). This back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

It resists oxidizing media, nearly all industrial chemicals, and steam. PTFE (Teflon) offers one of the lowest coefficients of friction of any solid and a very wide continuous service temperature range. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C).

Maintenance and OEM teams specify it across aggressive-media pipelines, food and beverage, and chemical processing.

This item is sold individually under part number TST143SO. Nominal inside diameter is listed as 2 7/16 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Item
TST143SO
Description
143 PTFE SOLID BACKUP RING FDA
Actual Cross Section
0.103 inch (2.62 mm)
Actual Inside Diameter
2.425 inch (61.6 mm)
Actual Outside Diameter
2.631 inch (66.83 mm)
FDA Compliant
No
Measurement System
Imperial
Metal Detectable
No
NSF Certified
No
Product Code
6002
Product Category
O-Rings - Backup Rings