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This website is owned and operated by Portland Bolt and Manufacturing Company. The intent of this site is to provide engineers, architects, contractors, steel fabricators, and fastener distributors with in-depth, technical information pertaining to Coupling Nuts Please contact us if you have questions, require additional information, need a price quote, or would like to place an order. For more information regarding Portland Bolt's manufacturing capabilities and full product line, visit www.portlandbolt.com.