Grayloc® Connectors

Outperforming Conventional Flanges

The Grayloc® clamp connector is the recognized industry leader for connecting piping and vessel systems worldwide. The Grayloc connector with its metal-to-metal bore seal technology provides comparable strength and seal integrity of a welded joint with the added versatility of a mechanical joint.

Improved Performance
Lower Maintenance Costs
Weight & Space Savings
Installation Time Savings

The standard Grayloc® assembly has two hubs arranged for butt welding to pipe. However, a complete line of other piping components is available, including socket weld and threaded hubs. Heavy duty connectors for oilfield and other applications are also available.

Other equipment manufacturers (valves, pumps, compressors, vessel, etc.) are licensed to machine Grayloc hub profile/ seats integral to their products. A complete line of fittings is available in the Grayloc design for all nominal pipe sizes and service conditions.


The Grayloc connector was developed in 1954 as the standard for critical service piping and vessel connections in a wide range of industries, applications and environments


Typical products include:

  • Adapters (Crossovers)
  • Ball Joints
  • Clamp Connectors
  • Compact Flanges
  • Crosses, Elbows, Spools & Tees
  • Extreme Pressure Connectors
  • Insulated Connectors
  • Manways & Vessel Closures (Standard & Hinged)
  • Metal-to-Metal Seals
  • Non-Slam Nozzle Check Valves
  • Jacketed Connectors
  • Instrumentation including Orifice Connectors & Thermowells
  • Piping & Vessel Nozzles
  • ASME Code Pressure Vessels
  • Remotely Operated Connectors (includes Automated and Subsea)
  • Other Critical Service Connections including R-Con and E-Con product lines

pdficon_small Installation and Maintenance of the Grayloc® Connector

pdficon_small Grayloc Brochure

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