News & insight
Does choosing PF or PC reduce the usable thread length?
15 May 2026
Yes – slightly, for a given nominal thread length (L).
All ISO 4753 end‑forms introduce a short length of incomplete thread (Lu) at the stud end, which reduces the usable thread length (Le).
PF and PC also increase the overall stud and overall bigHead fastener length due to the added pilot feature.
These dimensional effects are standardised by thread size, and do not affect load ratings or tightening torque values.