Knobs

 
METU Knobs

Advantages

Ergonomic and comfortable operation

Increased security as the screws are not protruding (only with standard access door versions)

Protected design

METU metal knobs
for operating temperatures above +80°C

 

Knob Torques

To determine the knobs' required torque, these have  been firmly tighten per hand before reading the achieved torque on a dynamometric wrench:

Access Doors Opening Sizes ≈ Knobs Torque ≈  
RD and RRD 18 180 × 80 mm M8 1000 to 1500 Nm  
RD and RRD 21 200 × 100 mm M8 1000 to 1500 Nm  
RD 315 300 × 150 mm M10 1200 to 1700 Nm  
RD and RRD 32 300 × 200 mm M10 1200 to 1700 Nm  
RD 42 400 × 200 mm M10 1200 to 1700 Nm  
RD and RRD 43 400 × 300 mm M10 1200 to 1700 Nm  
RD 53 500 × 300 mm M10 1200 to 1700 Nm  
RD and RRD 54 500 × 400 mm M12 2000 to 2000 Nm  
RD 64 600 × 400 mm M12 2000 to 3000 Nm  
RD 65 600 × 500 mm M12 2000 to 3000 Nm  
RD 75 700 × 500 mm M12 2000 to 3000 Nm  
         

When longer screws must be used, mostly for special or insulated access door, they will most probably protrude from the knob.