Knobs

METU Knobs

Photo of the METU protected turning handles

Ergonomic and comfortable operation
Increased security as the screws are not protruding (only with standard access door versions)
Registered protected design no 000135611-0002

METU metal knobs
for operating temperatures above +80°C

We have redesigned our metal access door knobs. They will gradually replace the less ergonomic triangular ones. Their function and performance remain unchanged.

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.

Stainless steel version:
use a stainless steel lubricant
to prevent seizing.