API 6A · ASME B16.20 · Manufacturer & exporter · Mumbai, IndiaRing Joint (RTJ) Gaskets
Solid metal rings machined to seal the highest pressures in oil, gas and refinery service. R oval, R octagonal, RX and BX, hardness tested and stamped on every ring.
Metal against metal. Nothing to blow out.
Bolt load drives the ring into the flange grooves. Because the ring is softer than the flange, it flows into the groove walls and makes a line seal that pressure only tightens.
3D renderOval R ring
The original ring style. Fits both round-bottom and flat-bottom grooves, so it suits older flanges.
Octagonal R ring
Flat faces give a higher sealing efficiency in modern flat-bottom grooves. The most specified style today.
RX & BX rings
Pressure-energised designs for API 6A wellheads and high-pressure equipment, up to 15,000 psi and beyond.
R, RX or BX. Matched to your groove.
Every ring is identified by its type and number, which tie it to the flange size, pressure class and standard.
Oval
Round-bottom or flat-bottom grooves to ASME B16.5 and API 6A.
Class 150-2500Octagonal
Flat-bottom grooves only. Better seal, the usual choice for new piping.
Most specifiedPressure energised
Taller outer face lets line pressure push the ring harder into the groove.
API 6A 6B flangesHigh pressure
Square section with a pressure-balance hole for API 6BX flanges.
Up to 20,000 psiAlways softer than your flange.
A ring must be softer than the flange groove so the ring yields, not the flange. Maximum hardness follows ASME B16.20, and every lot is hardness tested.
Ring material
Maximum hardness to ASME B16.20
Every ring carries
Permanent stamping for traceability
Zinc plated for the journey. Soft iron and low carbon steel rings are zinc plated against rust; stainless rings ship bright.
Machined, stamped, packed.
Real rings from our works, from small R rings to large diameters for ASME B16.47 flanges.
See all photos in our gasket gallery →
Big rings. Odd rings. Tomorrow.
Large diameters, exotic alloys and urgent shutdown orders.
Large diameter rings
Rings for ASME B16.47 Series A flanges and non-standard grooves, machined in one piece.
Bagged & labelled
Each ring bagged with its number, material and style, ready to go straight to site.
Soft iron & LCS
Zinc plated soft iron and low carbon steel rings for general refinery and pipeline duty.
Specifications
- Standards
- ASME B16.20, API 6A, or to drawing
- Flanges
- ASME B16.5, B16.47 Series A, API 6A 6B & 6BX
- Types
- R oval, R octagonal, RX, BX
- Materials
- Soft iron, LCS, F5, SS 304/316/321/347/410, Inconel, Incoloy, Monel
- Hardness
- To ASME B16.20 maximums, tested per lot
- Surface finish
- 63 µin Ra (R, RX), 32 µin Ra (BX)
- Marking
- Ring number, material, standard, JaySeal mark
- Coating
- Zinc plating on soft iron and carbon steel
- Inspection
- Third-party inspection by LR, BV, TÜV, SGS and others
Ring gasket materials & hardness.
From the JaySeal catalogue. Every ring is hardness-checked and stamped with its ring number and material code.
RTJ gasket materials, maximum hardness and marking
| Gasket material | Identification | Max. Brinell | Max. Rockwell B | Marking |
|---|---|---|---|---|
| Soft iron | D | 90 | 56 | R No. D |
| Low carbon steel | S | 120 | 68 | R No. S |
| 4-5 chrome ½ moly | F5 | 130 | 72 | R No. F5 |
| SS 410 | S410 | 170 | 86 | R No. S410 |
| SS 304 | S304 | 160 | 83 | R No. S304 |
| SS 316 | S316 | 160 | 83 | R No. S316 |
| SS 347 | S347 | 160 | 83 | R No. S347 |
The ring must be softer than the flange groove so that the ring, not the flange, deforms.
Ring types and pressure rating
| Type | Cross-section | Pressure (kg/cm²) | Standard |
|---|---|---|---|
| R oval | Oval | 700 | ASME B16.20 / API 6A |
| R octagonal | Octagonal | 700 | ASME B16.20 / API 6A |
| RX | Pressure-energised octagonal | 700 | ASME B16.20 / API 6A |
| BX | Pressure-energised, for 6BX flanges | 1500 | API 6A |
Dimensions and tolerances to ASME B16.20 tables 3 to 8. Sealing-surface finish 63 µin Ra for R and RX rings, 32 µin Ra for BX rings.
gasket vendor
Rings for refineries, wellheads and gas plants
Ring joint gaskets, answered.
What hardness should an RTJ gasket have?
The ring must be softer than the flange. Maximum hardness is 90 BHN for soft iron, 120 BHN for low carbon steel, 130 BHN for F5, 170 BHN for SS 410 and 160 BHN for SS 304, 316 and 347.
What is a ring joint (RTJ) gasket?
A solid metal ring that sits in machined grooves in two flanges. Bolt load presses the softer ring into the groove walls to form a metal-to-metal seal for high pressure and high temperature service.
What is the difference between oval and octagonal RTJ gaskets?
Oval rings fit both round-bottom and flat-bottom grooves. Octagonal rings fit flat-bottom grooves only but seal more efficiently, which is why most new flanges call for octagonal.
What is the difference between R, RX and BX rings?
R rings are standard oval or octagonal rings. RX rings are pressure energised, so line pressure helps the seal. BX rings are for API 6BX flanges at very high pressures and have a pressure-balance hole.
Why must the ring be softer than the flange?
So the ring deforms and the flange groove does not. ASME B16.20 sets a maximum hardness for each ring material, and we hardness test every lot.
What do you need to quote ring joint gaskets?
Ring type and number (for example R24 or BX156), or the flange size, class and standard, plus material and quantity. Tell us if you need third-party inspection.
Send your drawing.
Get a price.
Tell us the gasket type, size or drawing, material, pressure class, standard and quantity. Our engineers reply with price and delivery.
Quick enquiry
Replies go straight to our sales team.