Can I order bolts that have different Charpy test temperature requirements?

Yes, Charpy impact testing can be performed at specific test temperatures. Grades L7 and L43 require testing at -150 degrees Fahrenheit unless otherwise specified. Since passing this test can be a challenge, engineers will often allow for Charpy testing at a temperature that more closely resembles service temperatures for those fasteners. When Charpy testing at temperatures other than -150 degrees Fahrenheit is performed, the test temperature must be permanently stamped on the bolt heads or ends of studs.

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