Split PTFE Back-up Ring Kit

The use of single turn PTFE back-up rings will help control O-ring extrusion in high pressure applications. PTFE back-up rings are compatible with all hydraulic fluids, since they are virtually chemically inert, and can also be used in applications involving elevated operating temperature conditions.  In addition, PTFE back-up rings can greatly improve O-ring performance and extend service life, even if extrusion does not present a problem.

This 36 compartment kit contains a total of 325 single turn back-up rings in 36 different MS28774 sizes that fit AS568 O-Ring grooves.  This style features a 22° scarf cut to facilitate installation.  Included with each kit is a contents identification card which lists the size and actual dimensions of each ring.

Material: 55 durometer (Shore D) PTFE

Sizes and quantities include:

15 each of the following sizes: 005, 006, 007, 008, 009, 010, 011, 012,
10 each of the following sizes: 013, 014, 015, 016, 017, 018
10 each of the following sizes: 110, 111, 112, 113, 114, 115, 116
 5 each of the following sizes: 117, 118, 119, 120, 121
 5 each of the following sizes: 210, 211, 212, 213, 214, 215, 216, 217, 218, 219