+1 800-888-5223 Register Login

250 PTFE SOLID BACKUP RING FDA

PTFE Back-Up Ring, 4.984 in ID x 0.139 CS, 55D, White, -65 to 500°F

Picture of 250 PTFE SOLID BACKUP RING FDA
Status
Available
Est. Ship Date
31 Oct 2026
Material
PTFE (Polytetrafluoroethylene)
Dash Size
250
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
1/8 inch
Nominal Inside Diameter
5 inch
Nominal Outside Diameter
5 1/4 inch
Unit of Measure
EA
SKU:
TST250SO
Please login to see price and add to cart

Product Specification

-
The TST250SO is an AS568-250 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 4.984 in (126.59 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.262 in (133.65 mm). This back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

As a material, PTFE (Teflon) delivers excellent dielectric properties and near-universal chemical inertness. This material stands up to steam, strong acids and bases, and solvents. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C).

It sees regular use in laboratory equipment, semiconductor fabrication, and aggressive-media pipelines.

TST250SO ships individually. Check the compound against your process media, pressure and temperature before committing to a design.
Item
TST250SO
Description
250 PTFE SOLID BACKUP RING FDA
Actual Cross Section
0.139 inch (3.53 mm)
Actual Inside Diameter
4.984 inch (126.59 mm)
Actual Outside Diameter
5.262 inch (133.65 mm)
FDA Compliant
No
Measurement System
Imperial
Metal Detectable
No
NSF Certified
No
Product Code
6002
Product Category
O-Rings - Backup Rings