R Type RTJ Gaskets
The R-Type ring gasket are found in two shapes, Oval or Octagonal. Both shapes have the same pitch diameter as the flange groove they communicate to. These gaskets are used in pressures up to 10,000 PSI. The octagonal type has a higher sealing co-efficient than the oval, therefore it is the most wanted shape. The oval type is the only gasket that will fit a bottom radiused groove. Both the Gaskets can be used in Flanges with flat bottom v-grooves. OVL and OCT is used as abbreviation for Oval and Octagonal shapes respectively 
Combo R type RTJ Gaskets
These rings are non API rings which is produced based on End User’s requirement.
RX Type RTJ Gaskets
RX gaskets are designed for pressures up to 15,000 PSI. These gaskets are compatible to R Type Oval or R type Octagonal rings used on API 6B flanges. Thickness or the height of the these RX type of gaskets are more than R type gaskets, hence the weight of one ring is also more than R type gaskets, therefore it is expensive when compared to R type gaskets. Hence it doesn’t sell in huge volumes. RX type gaskets are best one which can be used in the areas where R type gaskets are used with high pressure flow like on shore under Sea applications.
BX Type RTJ Gaskets
BX gaskets are designed for pressures up to 15,000 PSI. These gaskets are compatible to R Type Oval or R type Octagonal rings used on API 6B flanges. Thickness or the height of the these BX type of gaskets are more than R type gaskets, hence the weight of one ring is also more than R type gaskets, therefore it is expensive when compared to R type gaskets. Hence it doesn’t sell in huge volumes. BX type gaskets are best one which can be used in the areas where R type gaskets are used with high pressure flow like on shore under Sea applications.
SRX and SBX RTJ Gaskets
The API has standardized the submarine consumption of ring gaskets with the SRX and the SBX series rings.
For API approved SRX and SBX Ring Numbers and its respective sizes please click on the respective categories.
There are no dimensional difference between the standard RX and SRX or the BX and SBX. The "S" prefix identifies a gasket as having intersecting vent holes, allowing a pressure less metal-to-metal initial contact between the gasket and flange groove, while made up underwater.
Specialty RTJ Gaskets
AX, CX, DX, and VX Gaskets is generally called the Specialty Gaskets. It is produced based on the drawings given by the end user.