• Technical Blogs
  • May 10, 2018

Are Self-tapping Screws Recognized in the Building Codes?

MTC Solutions

While self-tapping screws are not yet directly addressed in either NDS 2018 or CSA O86, ASSY carbon steel self-tapping screws have been awarded product approval reports for compliance to NDS 2018 (ICC ESR-3178, ICC ESR-3179) and CSA O86 (CCMC 13677-R). Included in these product approval reports are proprietary design values calibrated to each code. CCMC 13677-R was recognized in the recent edition of the CSA O86 commentary under Cl.12.6.5. The commentary notes that (due to extensive testing) ASSY carbon steel self-tapping screws are assigned a resistance factor Φ = 0.9 in CCMC 13677-R for withdrawal resistance, giving them an increase of approximately 50% over lag screws, which use a resistance factor Φ = 0.6.

Sign up for MTC Technical Blog

Sign Up

Register for a Technical Learning Session

NEWS LETTER

Sign up for MTC Newsletter and keep up to date with all our progress.