Flange Manufacturing Services

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At Signal Flange we have been manufacturing high-quality carbon plate flanges for more than 35 years. Offered in both standard and custom configurations, we manage the entire fabrication process in-house to provide fast turnaround and economical pricing. We are one of the nation's largest manufacturers of AWWA carbon steel flanges and have the ability to machine special flanges in all styles that measure up to 198" O.D.

Our extensive heavy-duty manufacturing capability combined with a large inventory of plate stock allows us to meet the most complex and challenging quality and delivery requirements. We leverage numerous fabrication methods, including plate burning, CNC and conventional machining, automated flange drilling, robotic welding with automatic positioning, and many other state-of-the-art technologies to produce flanges with precise tolerances and fine surface finishes. Our expertise spans all flange types, including blind and reducing flanges, spectacle and paddle blinds, O-rings and Victaulic rings, adapter rings, and many other custom flanges. We can provide thermal stress relief, die-stamp/etching identification markings, and apply protective coatings, all in-house.

As an ISO compliant manufacturing company, we perform both in-process and final inspections to ensure flange quality. In addition to traditional dimensional measurement equipment, we use high-end laser devices to verify tolerances. We offer non-destructive testing (NDT) on flanges for the most stringent applications to confirm they are defect-free. We provide material traceability and inspection reports to document that our products meet the highest standards of excellence.

Send us your drawing, and we will reply with a quote. We offer same day shipment for stock items and provide rush and emergency services when time is a factor or service is interrupted. For more detailed information about our standard and custom flange products, contact us today.

Group of Finished Flanges with 114" Flange

Signal Flanges Ready for Shipment

Signal Flange 66 Inch Flanges and 316 SS Bells Installed

Truckload of 96 Inch CLD Flanges

Flange Specifications

AWWA C207 Table 2 Class B Ring (86 psi) [Size 42.5 KB]
AWWA C207 Table 2 Class D Ring (175-150 psi) [Size 42.5 KB]
AWWA C207 Table 3 Class E Ring (275 psi) [Size 42.5 KB]
AWWA C207 Table 4 Class F Ring (300 psi) [Size 30.7 KB]
AWWA C207 Table 5 Blind Flange Thickness [Size 36.7 KB]
AWWA C207 Appendix B.1 Class D Hub (175-150 psi) [Size 44.8 KB]
AWWA C207 Appendix B.2 Class E Hub (275 psi) [Size 44.6 KB]

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Flange Manufacturing Capabilities

Additional Information