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Question: Are SAE Grade 2, 5, and 8 bolts available in diameters over 1½”?

Answer: No, SAE only covers bolts up to and including 1½” diameter. SAE J429 (1999), the specification that includes Grade 2, 5, and 8 fasteners, states, “This SAE standard covers the mechanical and material requirements for inch-series steel bolts, screws, studs, SEMS, and U-bolts used for automotive and related industries in sizes to 1½ in. inclusive.”

When diameters larger than 1½” are required, ASTM specifications should be considered since many cover fasteners larger than 1½” diameter. Generally speaking, for construction applications ASTM is the most appropriate standard. SAE is more commonly specified for automotive, equipment, or machinery applications.

SAE J429 Grade	Comparable ASTM Specification
Grade 2	A307 Grade A
Grade 5	A449
Grade 8	A354 Grade BD
This chart compares SAE and ASTM specifications that are similar but not identical in diameters through 1½”.

Posted on Thursday, October 13th, 2011 by Greg Lindsay. Filed under Technical. Comments may be followed using the RSS 2.0 feed.

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