Optimisation of Rail Nuts

Rail Nuts Type SM

Rail nuts type SM from STAUFF allow pipe, tube, hose and cable clamps (e.g. as per DIN 3015) to be positioned on mounting rails type TS which are available in different heights. 

The main advantage of this mounting type is obvious: The positioning of the clamps along the mounting rail can easily be adapted before final tightening; clamps can be added or removed without problems, even subsequently. 

We completely changed the manufacturing process in 2014 already. Since then, rail nuts have been made from steel as cold extrusion parts and then coated with a high-quality zinc/nickel plating (material code W3), which is the supply standard for the majority of other products from the STAUFF Clamps range. This surface provides resistance to red rust/base metal corrosion in the salt spray chamber over at least 1,200 hours. This allows durable and permanently reliable connections to be established.

To meet the growing customer demand for simplified mounting and dismounting as well as increased strength, we recently optimised the rail nuts further and adapted their shape as follows:

The lower section was lightly chamfered on both ends, so that the rail nuts can now be screwed in further to create additional contact surface area with the mounting rail.

The grooves on the top promote a stronger attachment of the rail nuts in the mounting rail.

The interaction of chamfers and grooves ensures that the rail nuts remain temporarily in position even during temporary dismounting of clamps and no longer fall/slide out of the mounting rail as before.

The geometry of the rail nut in the upper section was adapted so that the plastic cap, which ensures secure seating of the clamp body for vertical and overhead installation, now no longer slides from the steel part and gets lost as easily.

The following individual components are affected by the changeover:

Article         Designation              Version
1120001932 SM-1-8/1D-M-W3/3     metric ISO thread M6
1120001933 SM-1-8/1D-U-W3/3     UNC thread 1/4–20 UNC

This also applies to clamp assemblies / complete clamps which are supplied with enclosed or pre-assembled rail nuts.

Both variants are available from the warehouse at STAUFF Germany and will replace the previous versions with immediate effect. The existing article numbers remain unchanged. The suffix “/3” was added to the designation. We have taken organisational measures to prevent mixed deliveries of both versions as much as possible.

The changeover does not result in any changes regarding handling, mounting and application of the components.


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