SITRA released a "Pocket Book" in 2017 that is often confused with the 2019 norms. Always check the copyright page inside the PDF. It must explicitly state: "Sewing Data – Revised Edition 2019."
The 2019 PDF is famous for its updated "Personal, Fatigue, and Delay" (PFD) allowances: sitra norms 2019 pdf
New mobile app for real-time 40s UKG conversion calculations. SITRA released a "Pocket Book" in 2017 that
: The "best mills" are noted to achieve an adjusted UKG even lower than the standard, reaching below 3.8 . sitra norms 2019 pdf
The 2019 version updated the time values for: