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  1. To determine the size of a square O-ring, follow these steps:
    1. Measure the inner diameter (ID) using a ruler.
    2. Look up the ID on a size chart to find the corresponding standard size.
    3. Note the 3-digit “dash” number, which represents the O-ring size1.
    4. The most common standard size is 0.070 inches (1/16" nominal) with a 1.78mm cross-section2.
    Learn more:
    If the CS is one of the standard AS568 sizes such as.070,.103,.139,.210, or.275 inches, then you probably have a standard-sized o-ring. Measure its ID, and look it up on a size chart. If the ID is listed on the chart (or within tolerance), you have a standard size. Look up the 3-digit “dash” # and that will be your o-ring size.
    www.globaloring.com/blog/how-to-properly-size-an …
    The most commonly found o’ring size standard, even in metric based machinery 0.070″ (1/16″ Nominal) 1.78mm Cross Section
    sealingaustralia.com.au/oring-sizing/
     
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    1. Product Image
      Square O-Ring (Id:18 Mm, Cs:2 Mm, Od:22 Mm) By Contractorsx
      eBay
      Free shipping
      $7.01
      Square O-Ring (Id:18 Mm, Cs:2 Mm, Od:22 Mm) By Contractorsx
      eBay
      Free shipping
      $7.01
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    2. Product Image
      Moroso Square O-Ring (Replacement For Part No 21597)
      VCM_Motorsports
      $28.99
      Moroso Square O-Ring (Replacement For Part No 21597)
      VCM_Motorsports
      $28.99
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    3. Product Image
      Square O-Ring (Id:6.5 Mm, Cs:1.5 Mm, Od:9.5 Mm) By Contractorsx
      eBay
      Free shipping
      $6.65
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      Square O-Ring (Id:6.5 Mm, Cs:1.5 Mm, Od:9.5 Mm) By Contractorsx
      eBay
      Free shipping
      $6.65
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    4. Product Image
      2X Square O-Rings 1-3/8"Id X 1-1/2"Od X 1/16"Cs Buna-N Oring Nitrile
      eBay
      $6.74
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      2X Square O-Rings 1-3/8"Id X 1-1/2"Od X 1/16"Cs Buna-N Oring Nitrile
      eBay
      $6.74
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    5. Product Image
      Square O-Ring (Id:20 Mm, Cs:2 Mm, Od:24 Mm) By Contractorsx
      eBay
      Free shipping
      $7.16
      Square O-Ring (Id:20 Mm, Cs:2 Mm, Od:24 Mm) By Contractorsx
      eBay
      Free shipping
      $7.16
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    6. Product Image
      Square Profile Viton O-Ring - Dash 212 - Pack Of 5
      Walmart
      $18.97
      Square Profile Viton O-Ring - Dash 212 - Pack Of 5
      Walmart
      $18.97
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    7. Product Image
      10X 013 Square O-Rings 7/16" Id X 9/16" Od X 1/16" Cs Buna-N Oring
      eBay
      $2.19
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      10X 013 Square O-Rings 7/16" Id X 9/16" Od X 1/16" Cs Buna-N Oring
      eBay
      $2.19
      See details
    8. Product Image
      Square O-Ring (Id:8 Mm, Cs:2 Mm, Od:12 Mm) By Contractorsx
      eBay
      $6.69
      Square O-Ring (Id:8 Mm, Cs:2 Mm, Od:12 Mm) By Contractorsx
      eBay
      $6.69
      See details
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  3. O-Ring Size Chart for U.S. & Metric Standard Sizes

    WEBO-ring size charts for U.S. and metric o-ring sizes. Find the right size o-rings, quad-rings, x-rings and square-rings for your application. Custom and non-standard o-ring sizes available with no tooling or setup fees.