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Ring Joint Gasket is machined from solid metal in a variety of shapes and designed for high pressure, high temperature or highly corrosive applications by selecting the most suitable material and shape. It is designed to withstand exceptionally high assembly loads over a small area, thus producing high seating stresses.
n 640 PL Plain type RJG
n 640 OV Oval type RJG
n 640 OC Octagonal type RJG
n 640 RX RX type RJG
n 640 BX BX type RJG
n 640 S Special type RJG
They seal by creating very high unit load, metal-to-metal line contact with special mating flanges. Metals are typically chosen such that the ring joint gasket is softer than the flange material in order to prevent damage to the flanges and thereby causing plastic flow of the gasket into the flange faces. The design of the gasket or cross section is chosen based on the existing flange configuration and designed maximum system pressure. Gasket and flange surface finishes and dimensional accuracy along with gasket hardness must be carefully controlled in order to obtain and maintain an effective seal.
Material | Code Sample | Hardness(HB) | Temperature(℃) |
Soft Iron | R23 SI | 90 | 530 |
Carbon Steel | R23 CS | 120 | 530 |
304(L), 321, 316(L) | R23 S304 | 160 | 750 |
5Cr1/2Mo | R23 F5 | 130 | 500 |
Copper for 640PL |
| 50 | 400 |
Aluminium for 640PL |
| 30 | 300 |
Standards For Ring Joints Gaskets Used With Flanges | ||
RJG Style | RJG Standard | Flange Standard |
R | ASME B 16.20 API 6A | ANSI B 16.5 ANSI B 16.47 Series A |
RX | ASME B 16.20 API 6A | API 6B |
BX | API 6A | API 6BX |
* Can be ordered according to the detailed drawing.


Hitex established in 2002, is a leading manufacturer and supplier of fiberglass products for the applications of transportation, chemical engineering, architectural engineering, heat insulation, sound absorption, etc. Hitex engages in the export of fiberglass yarn and roving, fiberglass chopped strand mats, fiberglass woven roving,fiberglass fabrics etc. We design, build, manufacture and quality control our own products allowing the strictest of specifications, which directly benefit from Hitex years of experience gained in the global Composite market. Hence, all of our production plants are certified with ISO9001/ISO14001.

If you have any inquiry, welcome to ask for quote and we will relpy you as soon as possible.
Q1.You are a trading company or manufacturer?
We are manufacturer with more than 10 years production experience, and we have our own factory in yuyao.
Q2.Can you send me a sample? Is it free?
Yes, the samples is free, but the courier charge should be on your side.
Q3.Mode of transportation?
By sea or by air.
Q4.How about the Delivery time?
Usually around 2-3 weeks after order confirmed.
Q5.Can you product the customized goods?
Surely, we can be customized according to your demanding.
Q6.What kinds of payment you accept?
We accept T/T, D/A, L/C,D/P,O/A.
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