These were previously referred to as "SMG". The new designation is now "SM".
Therefore, the ordering designations of rail nuts made from stainless steel 1.4301 / 1.4305 or AISI 304 / 303 (STAUFF material code W4) and stainless steel 1.4401 / 1.4571 or AISI 316 / 316 Ti (STAUFF material code W5) correspond to those for the products made from carbon steel.
In addition to the designations of individual parts, ordering designations of complete clamps / clamps assemblies, which include rail nuts made from stainless steel, have also been adapted correspondingly.
STAUFF Rail Nut SM-1-8/1D in a Mounting Rail
STAUFF Clamp with Rail Nuts SM-1-8/1D
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Rail Nuts SM made from Carbon Steel and Stainless Steel in the STAUFF Online Shop