What does the term “B7” refer to?
This term is short for “ASTM Grade A193, B7”. “ASTM” stands for American Society for Testing Materials, an organization that writes and maintains industry standards for materials. Their standard A193 covers bolting materials used primarily in high temperature applications. ACME screws can be made to this specification but at a high premium (See Question 10 above). Sometimes users specify this material believing that it guarantees a better product than standard materials. The product will be different but not necessarily better. For a review of your specifications to see if they fit your needs, contact Roton Application Engineering.
