Better bonding fasteners
Our proprietary surface treatment dramatically increases bond strength. The process improves surface area, surface energy and wicking properties, giving you an unbeatable bond.
Spida bases have a 'castellated' circumference. This interlocks with the adhesive or binding polymer increasing torsional resistance where mechanical advantage is greatest.
Our metal engineers have crafted each component with such care and precision that their crystalline microstructure actually flows in the direction of the forces passing through them, effectively improving their strength-to-weight ratio.
Spida fixings come with an optional concave base that optimises the bond line required by most adhesives. It is this bond line that allows exothermic adhesives such as epoxy to fully cure. This unique shape also dissipates stress over the entire base helping to prevent fixing failure under high loads.
Our fastener heads are circumferentially welded to the rear of the base, vastly improving tensional strength. The base is the optimal thickness to withstand the high loads our fixings are designed for.
Our fasteners are precision engineered from heat treated high-tensile carbon steel (20MnB4/CR4) or marine grade stainless steel (316L). To top this off you can select from our premium range of passivation and plating options to ensure ultimate corrosion resistance.
How is Spida different from other bonded fasteners?
Spida fixings have been designed from the ground up to dissipate stress, bond better and withstand higher forces.
What makes our fixings unique is:
-Our AdMax surface finish for enhanced bond strength
-Their castellated edge for anti-torsion where mechanical advantage is greatest.
-The optional concave base for bond line depth control and stress dissipation.-The way our fasteners are welded to the rear of the base increasing performance.
How strong are Spida fixings?
Strong!... How strong? Well that depends on the model, it's installation, the substrate and the type of forces applied. For example if a Spida fixing with a large base is laminated into a composite structure and a high tensile load is applied, then the point of failure is likely to be the fastener itself (the thread or shank).
Compare that to a fastener that goes through the structure, such as a bolt, the point of failure will likely be the same (at the thread or shank) however in using a bolt you will have had to drill through the structure - reducing its structural integrity. A 5mm drill hole in a 1000 gsm sheet of carbon fibre will sever around 96,000 filaments. Structural integrity can be recovered by adding extra layers of lamination and additional fasteners but this adds weight, cost and time. A well installed Spida fixing achieves the same performance without the hole drilling.
Intuition dictates that drilling holes and bolting or riveting through structures should be the best way of securing them but maybe it's time to re-think this old notion. Our inspiration for a new way of designing with bonded fasteners comes from some of the most efficient structures on the planet; animals; ligaments and tendons do not go through bones; instead they are tightly bonded to them. Maybe future structures will not just work for us but also work like us.
Do you recommend an adhesive?
We work closely with several adhesive manufacturers who are the specialists in recommending an adhesive to match your requirements. Contact us if you require advice.
I need a size that isn't listed, can you make it?
We offer over 50,000 option combinations, however if you can't see what you're looking for then contact us for a quote.
Fixing or fastener?
These terms are often used interchangeably, however:
- -a fastener is the actual object that makes the connection between two structures;
- -a fixing is the complete system used for connecting the structures (including the base, adhesive and any lamination holding the fastener in place).
What materials can I use Spida fixings on?
- -Carbon fibre and glass fibre
Depending on the material and application they can be installed using a variety of methods including:
- -Bonding (works on any surface)
- -Welding (metal and plastic welding)
- -Press fit (into a pre moulded thermoplastic enclosure)
- -Molding - including...
- -Hand lay up,
- -Open mold,
- -Hot press,
- -Vacuum tooling,
- -Injection molding,
- -Concrete encapsulation.
See our installation guides for further information.