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ASTM A320 Powered by Portland Bolt

What is the thread series for A320 bolts?

Unless otherwise specified, A320 bolts larger than 1” diameter will use 8UN thread series.

This entry was posted in FAQs on May 4, 2018 by PB Micro.

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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, contractors, fabricators, and original equipment manufacturers with in-depth, technical information pertaining to the ASTM A320 specification. 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.

Additional Resources

ASTM: If you are working with A320 heavy hex bolts and studs on a regular basis, we strongly recommend purchasing a copy of the ASTM A320 specification and ASTM A962 specification from ASTM international.

ASME: ASME B18.2.1 which covers heavy hex bolt dimensions, and ASME B1.1 which provides dimensional criteria for both UNC and 8UN threads can be purchase from Techstreet.

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