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Back-Up Ring Kit

Back-up rings kits are made with Buna 90, Viton or Teflon. Back-up rings are used to prevent the O-ring from entering the clearance gap. When high pressures are exerted on the O-ring, its soft rubber material can be forced into the clearance gap causing the O-ring to extrude. The hard Back-up ring material will keep the O-ring material from flowing into the gap which will prevent premature failure.



Image Model+ Item Name Stock Price Quantity Discounts
Back-up Rings Nitrile Duro 90 Kit 36-Sizes 293-Pieces K293X36B

Back-up Rings Nitrile Duro 90 Kit 36-Sizes 293-Pieces

Contoured Back-up Ring Kit Contoured back-up rings are anti-extrusion devices, generally recommended when systemic pressure exceeds 1500 psi. The...
0
$39.00

Add:

Quantity Discounts
1$39.00
2-9$35.10
10+$29.25
Back-up Rings Split PTFE Kit 36-Sizes 325-Pieces K325X36TBU

Back-up Rings Split PTFE Kit 36-Sizes 325-Pieces

Teflon PTFE Back-up Rings Kit Our Industrial Teflon Back-up Ring Kit is the industry standard. The kit contains a total of 325 back-up rings, in 36...
0
$120.00

Add:

Quantity Discounts
1$120.00
2-9$108.00
10+$90.00
Back-up Rings Solid PTFE Kit 36-Sizes 325-Pieces K325X36TBU-S

Back-up Rings Solid PTFE Kit 36-Sizes 325-Pieces

Teflon PTFE Solid Back-up Rings Kit Our Industrial Teflon Back-up Ring Kit is the industry standard. The kit contains a total of 325 back-up rings,...
2
$120.00

Add:

Quantity Discounts
1$120.00
2-9$108.00
10+$90.00
Back-Up Ring Kit - 510 Piece Kit 25 Sizes - 1/16" C/S MBOX1-K510X25BU90

Back-Up Ring Kit - 510 Piece Kit 25 Sizes - 1/16" C/S

510 Piece Deluxe Contoured Back-up Ring Kit Contoured back-up rings are anti-extrusion devices, generally recommended when systemic pressure exceeds...
0
$69.00

Add:

Quantity Discounts
1$69.00
2-9$62.10
10+$51.75
Back-Up Ring PTFE Kit - 510 Piece Kit 25 Sizes - 1/16" C/S MBOX1-K510X25TBU

Back-Up Ring PTFE Kit - 510 Piece Kit 25 Sizes - 1/16" C/S

510 Piece Deluxe Teflon PTFE Back-up Rings Kit The use of single turn PTFE back-up rings will help control O-ring extrusion in high pressure...
0
$200.00

Add:

Quantity Discounts
1$200.00
2-9$180.00
10+$150.00
Back-Up Ring Kit - 440 Piece Kit 24 Sizes - 3/32" C/S MBOX2-K440X24BU90

Back-Up Ring Kit - 440 Piece Kit 24 Sizes - 3/32" C/S

440 Piece Deluxe Contoured Back-up Ring Kit Contoured back-up rings are anti-extrusion devices, generally recommended when systemic pressure exceeds...
1
$83.50

Add:

Quantity Discounts
1$83.50
2-9$75.15
10+$62.63
Back-Up Ring Kit - 280 Piece Kit 19 Sizes - 1/8" C/S MBOX3-K280X19BU90

Back-Up Ring Kit - 280 Piece Kit 19 Sizes - 1/8" C/S

280 Piece Deluxe Contoured Back-up Ring Kit Contoured back-up rings are anti-extrusion devices, generally recommended when systemic pressure exceeds...
1
$84.00

Add:

Quantity Discounts
1$84.00
2-9$75.60
10+$63.00


What are the most common O-ring compounds?

We stock O-Rings in over 20 different compounds and durometers the following six are the standard rubber materials in a range of durometers (Shore A) hardness to satisfy practically any service condition:

Buna-N O-Rings / Nitrile O-Rings / NBR: Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-40°F to +257°F) and one of the best performance-to-cost values. It's an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F.
AS-568 Buna-N O-Rings | Metric Buna-N O-Rings

Viton® O-Rings / FKM: Fluorocarbon (Viton®) exhibits exceptional resistance to chemicals, oils, temperature extremes (-13°F to +446°F), low compression set, low gas permeability and excellent aging characteristics. Applications include: aircraft engines, automotive fuel handling systems, and chemical processing industries. FKM is also suitable for high vacuum applications. It is not recommended for exposure to ketones, alkalis, and Skydrol® fluids. Custom compounds are available with improved chemical and low temperature resistance.
AS-568 Viton® O-Rings | Metric Viton® O-Rings

Ethylene-Propylene / EPDM O-Rings: EPDM has outstanding resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (-40ºF to +275ºF); but it is not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments. This popular rubber compound is usually the first choice for low torque drive belt applications.
AS-568 EPDM O-Rings | Metric EPDM O-Rings

Silicone O-Rings / VMQ: In the Silicone family, you will find compounds which are superior as static seals in extreme temperature conditions. Standard compounds handle operating temperatures -85º to +400ºF. Silicone compounds are popular in food and medical applications because they are very clean and do not impart odor or taste. Special Phenyl silicones can be used down to -148°F.
AS-568 Silicone O-Rings | Metric Silicone O-Rings

Neoprene® O-Rings / CR: Neoprene (-40º to +250ºF) is reasonably priced and features good resistance to petroleum oils, ozone, sunlight and oxygen aging, relatively low compression set, good resilience and outstanding physical toughness. It is the preferred sealing material for the refrigeration industry because of its resistance to ammonia and Freon®.
AS-568 Neoprene® O-Rings