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No drilling, no milling! This guarantees quick and easy assembly. Robotunits unique Fastening Technology plays a decisive role here. It offers strength comparable to welding technology, with an impressive tensile force of up to 4 tons – all achieved with just a single connection. In short: maximum strength at an attractive price. Robotunits Fastening Technology is also characterized by its low overall height and enables unlimited reusability.

With Robotunits, you can connect aluminum extrusions without drilling or milling – using simple standard screws and space-saving, fully load-bearing fasteners on both sides. Thanks to the unique Robotunits Fastening Technology, a single component is sufficient for double-sided fastening. This allows you to position and install quickly, flexibly, and precisely.

Fastening Technology 40mm Series Features

Worldwide unique form-fitting and play-free centrally aligned Fastening Technology
Connect without drilling and milling
Two-sided connection with only one fastener
Outstanding process reliability and 100 % repeatability
Short design and assembly time easy, post-assembly repositioning
Strength comparable to a welded connection

Fastening Technology 40mm Series Applications

Robotunits Workbenches
Cobot Station
Pick-up station for AGVs

Fastening Technology 40mm Series Products

Fastener 16x40

Application: 90° fastener for extrusion PIL 1640.

Fastener 40x40

Application: 90° fastener on 40mm series for extrusions PIL 4040 and PIL 4080 transverse.

Fastener 40x80

Application: 90° fastener for extrusions 40×80 and 80×80

Surface Fastener 40x40

Application: Used for connection to non-Robotunits surfaces on 40mm series for extrusion PIL 4040.

End-to-End Fastener 40x40

Application: For end-to-end connections of the 40mm series for extrusion PIL 4040.

Angle Fastener 45°

Application: for rigid 45° bracing, e.g., guardings, frames

Elbow Joint 40

Application: for variable angle connections, e.g., guardings, frames, swing arms

Q&A Section with Expand/Collapse Icons

Extrusion Technology 40mm Series Q & A

+ What profiles and slot sizes is this fastening hardware compatible with?

The 40 mm series fastening components are designed to work with 40 × 40 (and other 40 mm-format) aluminum extrusions, typically those with T-slots sized for M8 or M10 fasteners (depending on the extrusion manufacturer). Always verify the T-slot width and slot depth of your extrusion system so that the head or nut of the fastening element can seat properly without interference.

+ What kind of loads (tensile, shear, moment) can the fastening system sustain?

Robotunits and similar suppliers often publish load ratings (axial pull-out, shear, bending moment) for each fastening component. As a rule of thumb, the capacity will depend on the contact area inside the extrusion slot, the grade of the fastener material (steel, stainless, etc.), and the friction/clamping force applied. For your application, choose a fastener that has a sufficient safety margin above your expected loads. (If load specs are not listed, request them from the supplier or ask for test certificate data.)

+ How easy is installation or adjustment in the field (after assembly)?

Many 40 mm series fastening products are designed for relatively easy installation — sliding into the slot before tightening, sometimes with captive nuts or drop-in T-nuts. Some allow adjustments (sliding the fastener before final tightening) so minor repositioning is possible. However, in tight or inaccessible locations, tool access might be constrained, so check whether the fastener head or nut requires special wrenches or clearances.

+ How does this fastening system interface with external components or accessories?

Fastening parts for 40 mm profiles often include threaded holes, pads, or brackets for attaching plates, panels, sensors, guards, or other equipment. Ensure the fastener’s exposed threads or mounting surfaces match your accessory hardware (e.g., matching thread size, orientation, or spacing). Some systems also offer modular brackets or adaptors that mate directly into the extrusion slots or fastening points.

+ What material and finish options are available, and how do they affect corrosion resistance or durability?

Fastening hardware is commonly available in carbon steel (e.g., zinc plated, black oxide), stainless steel (e.g. A2/A4), or sometimes aluminum. Zinc plating gives basic corrosion protection; stainless steel is preferable in harsher or outdoor environments (humidity, chemicals). Also check whether the fastener’s plating or coating is fully covering exposed surfaces or threads. If your application has high vibration, dynamic loads, or exposure to chemicals, choose more robust material options.

Robotunits Extrusion and Fastening Technology Catalog

Robotunits Fastener Loads Datasheet

Robotunits Extrusion Tolerances Datasheet

Call us today at (855) 737-4716 to learn more, or fill out our online form and someone will get back to you.