Grayloc® Clamp Connectors
Field-proven, compact, and lightweight alternative to conventional flanges.
Our trusted Clamp Connector design provides a simple-to-install solution that saves both space and weight across your operations. Delivering unparalleled design quality and reliability since the 1950s, our connectors feature metal-to-metal bore seal technology to meet your critical service piping and vessel connection requirements. The connectors’ light weight, smaller diameter, and shorter length support the design of optimized systems.
Reduce installation time with quick and easy assembly
Eliminate fugitive emissions
Reduce maintenance costs and spare parts inventory
Grayloc® Clamp Connector Videos
How Does a Grayloc® Clamp Connector Work?
Learn how the Grayloc® Clamp Connector creates a reliable, metal-to-metal seal. See why it’s a trusted solution for high-pressure, high-performance environments.
Why are Grayloc Clamp Connectors Better than Flanges?
Discover the key performance advantages of Grayloc® Clamp Connectors over traditional flanges—including improved sealing integrity, lighter weight, and reduced installation time.
Grayloc® Clamp Connector Variations for Critical Applications
Explore the full range of Grayloc® Clamp Connector configurations, sizes, and materials engineered to meet diverse project needs.
Grayloc® Clamp Connector Installation and Operation
Master the steps to assemble, disassemble, maintain, and repair Grayloc® Clamp Connectors.
Technical Specifications
| Nominal pipe size | ½ to 64 in |
| Design pressure rating | From full vacuum up to 60,000 psig |
| Design temperature range | -423 to 1700°F / -253 to 927°C |
| Hub | Nickel alloys, carbon, low-alloy, stainless and duplex stainless steels |
| Seal Ring | Nickel alloys, low-alloy, stainless and duplex stainless steels |
| Bolting | Nickel alloys, low-alloy, stainless and duplex stainless steels |
| Clamp | Nickel alloys, carbon, low-alloy, stainless and duplex stainless steels |
| ASME B31.1, Power Piping |
| ASME B31.3, Process Piping |
| ASME B31.4, Pipeline Transportation Systems for Liquids and Slurries |
| ASME B31.8, Gas Transmission and Distribution Piping |
| ASME B31.12, Hydrogen Piping & Pipelines |
| ASME Section I |
| ASME Section VIII Div. 1 |
| ASME Section VIII Div. 2 |
| ASME Section VIII Div. 3 |
| API 6A: Specification for Wellhead and Christmas Tree Equipment |
Product Documents
Product Variations
- Clamps
- Hubs
- Seal Ring
Typical Applications
Real Impact. Real Savings.
Read our case studies featuring Grayloc Clamp Connectors.
Contact Us
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