Technical Design Information

As Portland Bolt does not have any architects or engineers on staff, we are unable to provide technical assistance as to which timber connector should be used. Since no ASTM specification covers split rings, the best place to go is the American Wood Council, specifically the National Design Specification for Wood Construction. Appendix K of the NDS contains information regarding the size of flat washer to be used with the bolt and nut when used in conjunction with split rings.

ASTM Specifications Related to Split Rings

• A153 (Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware): Both 4” and 2-1/2” are available in plain finish and hot-dip galvanized.