EWIKON L2X, Руководство по эксплуатации

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80 HPS-III-Heißkanalsystem_Anziehdrehmomente-Zylinderschrauben-Verteilerverschraubung-Halteschrauben_BA_V-2-0_EN
Tightening torques
9. Tightening torques
9.1 Tightening torques for socket head screws
• Tighten socket head screws with the matching torques according to the following chart. All values are non-binding stan-
dard values for socket head screws with internal hexagon and standard metric thread complying with DIN EN ISO 4762.
All values were determined in accordance with the guideline VDI 2230 sheet 1:2014-12 which is based on the most frequent-
ly used torque controlled tightening method with normally 90% utilisation of the minimum yield strength Rp0,2. The values
given are valid for socket head screws with property class 8.8, 10.9 and 12.9 with internal hexagon and standard metric
thread complying with DIN EN ISO 4762 (replacement for DIN 912).
• The values are valid for clearance holes with tolerance "medium" complying with DIN EN 20273.
• The values are to be understood as maximum permissible tightening torques (without safety factor).
• Only calibrated tightening tools must be used.
(When the tightening method/ the tightening tool shows a greater variation (approx. > ±5%) the required tightening torque
MA
must be appropriately reduced to avoid overstressing (control test required). It must be considered that different tigh
-
tening methods can show a different variation.)
• EWIKON generally recommends to use screws with property class 12.9 only.