Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Congratulations IDS on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Silicon Bronze Bolting Specifications

Thread starter jay165
Start date Sep 19, 2003

Status: Not open for further replies.

Sep 19, 2003

jay165

Mechanical

Our current specifications call for Si-Br nuts made out of ASTM Alloy 651 (UNS 65100) per ASTM F467. Per ASTM, the nuts must be cold formed and have a minimum hardness of 75 Rockwell B. We were told by our supplier and the leading manufacturer that we are the only entity that requires these type of nuts. We would like to revise our specifications to allow Alloy 655 (UNS C65500) hot formed nuts per ASTM F467 (the same material as the stud bolts). These nuts are approximately 1/3 to 1/10th the cost of the 651 nuts. We are about to purchase the bolting for a large repair job that involves thousands of bolt and nut sets.

Does anyone have any experience with using either type of material and whether the added expense is justified?