# Dichtomatik ST442S PTFE Solid Backup Ring for High-Pressure Sealing - MROSupply.com

***Dichtomatik ST442S PTFE solid backup ring prevents O-ring extrusion in high-pressure static and dynamic sealing applications. PTFE backup rings offer excellent chemical resistance and a wide temperature range from -100°F to +500°F. Suitable for use in hydraulic and pneumatic systems where gap extrusion is a concern.***



## Product details:

- Catalog number: 75089678
- SKU: 2809585
- Price: ***$29.51*** Each
- Quantity: This vendor has a minimum order quantity of
2.Order minimum ($) may be applied.
Add desired QTY to cart and proceed to checkout to view minimum'

- Brand Minimum Order Quantity - 2
(This is the minimum order quantity if ordering this unit alone
from the vendor. Adding other products from the same vendor will reduce
the overall requirement. If adding multiple products from same vendor,
please add all products to cart to see total minimum.)
- Shipping: ***FREE SHIPPING***  ON ORDERS OVER $100
- Typically Ships in: 1 day
- Brand: [Dichtomatik](https://www.mrosupply.com/brands/dichtomatik/)
- Category: 
    - [Standard Flat Back-Up Rings](htts://www.mrosupply.com/seals/back-up-rings/standard-flat-back-up-rings/)
    - [Back-Up Rings](htts://www.mrosupply.com/seals/back-up-rings/)
    - [Seals](htts://www.mrosupply.com/seals/)
- Unit of measure: each
- Weight: 0.046 lb
- Technicall support: contact supplier for technical support on 800 328 2840


## Product images:
- https://static.mrosupply.com/images/noimage.webp


## Product attributes;

  
- Dash Number: 442
  

  
- Domestic/Import: Import
  

  
- I.D.: 7-1/4 in
  

  
- Material: PTFE
  

  
- O.D.: 7-3/4 in
  

  
- Temperature Rating: -65 to 500 deg F
  

  
- Thickness: 0.052 in
  

  
- Type: Solid
  

  
- Width: 0.239 in
  


## Product's reviews:
- Awesome - works grate
- Wiper - LOOK GOOD
- A+ - Perfect fit, my boat trailer back in the water.
- F150 a/c compressor get back o.d" - I Saved on the Cost of Parts & Labor by Redi-sleeving my I.D" of my A/C collar.
MRO has fair prices for redi-sleeve.