The STAUFF clamps in the twin  series in accordance with DIN 3015, Part 3 enable two cables to be fastened in parallel with just a single bolt. This saves space, reduces material usage and simplifies installation - especially in compact system layouts.

A particularly space-saving variant is the so-called surface-mounted installation, in which several layers of clamps are installed directly on top of each other. As a rule, STAUFF recommends a maximum of three layers to ensure stability and the required retaining forces, even at the upper levels. The stability of the structure must be checked individually by the user and evaluated in the overall context of the system and the expected mechanical loads!

Lowest layer:

Fastening with a STAUFF stacking bolt, which is firmly bolted into the substructure. This screw has an internal thread in the head.

Middle layer:

Another stacking bolt is bolted into the internal thread of the lower screw.

Top layer:

Complete the installation with a standard external or internal hexagon head bolt.

Locking plates are used between the individual layers to stabilise the connection and prevent the surface-mounted bolts from loosening automatically.

STAUFF offers two variants of locking plates for stacking assembly:

SI - Safety Locking Plate

• Interlocks with the respective clamp body underneath

• Secures the stacking bolt against self-loosening

• Also enables the upper clamp position to be rotated

• Cost-effective solution for flexible applications

SIV - Safety Locking Plate with Anti-Twist Feature

• Interlocks with the respective clamp body underneath and above

• Secures the stacking bolt against self-loosening and at the same time prevents the top layer from twisting

• Ensures a uniform appearance

• Ideal for applications with high visual or mechanical requirements

Until now, the SIV locking plate was available in two separate versions for size 1D (with M6 thread) and for sizes 2D and 3D (with M8 thread). Clamps of sizes 4D and 5D could not be secured against twisting for structural reasons.

This has now changed:

A structural adaptation of the SIV plate enables it to be used for sizes 2D to 5D. This means that, for the first time, larger twin clamps can also be used in surface-mounted installation without twisting.

New material designation:

The previous designation SIV-2-3D-... has been replaced by SIV-2-5D-....

Standard materials:

• Steel, zinc/nickel-coated (SIV-2-5D-W3)

• Stainless steel V4A (SIV-2-5D-W5)

• Other variants available on request

The new securing plate not only provides more stability, but also more flexibility:

• Standardised plate for all sizes from 2D to 5D

• Combination of different clamps possible (e.g. size 5D at the bottom, size 3D above, size 2D at the top)

• Ordered alignment of all layers

• Reduced storage costs thanks to universal components

• Improved appearance and installation quality

This innovation makes stacking assembly with STAUFF clamps even more versatile and efficient - especially in demanding applications.

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