Ring Joint Gaskets

Overview

Ring Joint Gaskets (RTJ) are precision-machined, metallic sealing rings used primarily with API 6A or ASME B16.5 flanged connections in high-pressure oilfield and petrochemical applications. Unlike typical soft gaskets, RTJs rely on metal-to-metal contact and plastic deformation for sealing.

When compressed between flanges with matching grooves, they create a reliable seal even under extreme service conditions (pressure, temperature, corrosive environments).

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Features & Benefits

Precision-machined metallic sealing rings
Metal-to-metal contact and plastic deformation for sealing
Temperature range up to 650°C (1200°F)
Precise machining tolerances: ±0.2 mm or tighter
Surface finish per ASME B16.20 guidelines
Hardness typically 10-30 Brinell points below flange hardness

Types of RTJ Gaskets

R-Type Ring Joint Gaskets

Octagonal or oval cross-section ring design
Conforms to API 6A or ASME B16.20
Pressure Range: 5,000 PSI to 10,000 PSI (Class 300 to Class 2500)
Available in Oval R-Type (older design) and Octagonal R-Type (better sealing)
Ideal for general oil & gas line connections, pipeline systems, pressure vessels

RX-Type Ring Joint Gaskets

Pressure-energized, octagonal cross-section with higher radial profile
Compatible with API 6B flanges
Pressure Range: Above 5,000 PSI
Self-energizing design – higher pressure creates tighter seal
Suitable for high-pressure wellhead, subsea equipment, refining units

BX-Type Ring Joint Gaskets

Special geometry designed for API 6BX flanges
Pressure Range: 10,000 PSI and above (Class 5,000 / 10,000 / 15,000 / 20,000)
Extremely tight tolerances and fully confined ring groove
Ideal for high-pressure wellhead and subsea applications

Materials & Specifications

Material	Applications	Features
Soft Iron / Low Carbon Steel	Standard service	Minimal corrosion requirements, used with carbon steel flanges
Stainless Steel (304, 316, 321)	Offshore/corrosive environments	Improved resistance to sour gas, H₂S, brine
Inconel® (625, 825)	Extreme conditions	High-temperature, sour gas, subsea operations
Monel® 400	Specific corrosive services	Ideal for brine or mild acid applications
Duplex / Super Duplex	Offshore/high-salinity	Excellent for chloride-rich, highly corrosive mediums

Design Standards

API 6A for oil & gas wellhead equipment
ASME B16.20 for dimensions and tolerances
ASME B16.5 / API 6B & 6BX for flange specifications