O-rings used for sealing straight thread
tube fittings on a boss.
|The standard sizes for O-rings include 20 sizes
used to seal straight-thread tube fittings on a boss. A boss is cylindrical projection on a casting or forging. The end of that
projection is machined to provide a flat, smooth surface for sealing. Straight
threads used with an O-ring provide a better seal than tapered threads used alone.
The 900 series of dash
numbers identifies the 20 sizes of boss seals. Except for size -901, the digits
after the 9 identify the nominal tube size in 16ths of an inch. The tube size is its
outside diameter (OD). For example, size -903 is intended for use with 3/16-inch
tube. The one exception, size -901, is intended for use with 3/32-inch tube.
1/16-inch tube is not common in aircraft use.
| Material Selection Guide (Order Here) |
| O-Rings Explained | O-Rings Sizing
| Fluid Compalibility Guide | O-Ring Failure Analysis |
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