Further assistance may be obtained by contacting Duggan Profiles on +353-56-7722485
The majority of connections in the Duggan Prosigma system are designed around the use of M12 bolts fitting through 14mm holes. In certain instances where M12 is not deemed adequate M16 bolts fitting through 18mm holes are used (The Eaves Beam Cleat connection to the mainframe is an example). Both 14 & 18mm holes are produced as standard and these may be punched at any position across the width of the blank strip, in other words punching is not limited to standard gauge lines. 
Slotted Holes
Standard horizontal slot lengths are 14 x 4 and 14 x 40 as shown below but any slot length may be achieved using multiple iterations of these punches.  

14mm vertical slots may be achieved by nibbling using a series of closely spaced 14mm holes. 18mm slots, both horizontal and vertical may also be produced by nibbling using 18mm round holes. Slots may be punched at any position across the width of the strip. 
Service Hole
A round 60mm diameter hole may be provided on the centreline of selected sections to accommodate the provision of services such as ducting, pipes, cabling etc. The sections in question include Sigma+ sections of 235 or greater and all Cee sections. Sigma+ sections less than 235mm do not have adequate web depth to accommodate the 60mm hole. Service holes are only available in 60mm round and can only be punched on the centreline of the strip. Please note that due to the considerable volume of material removal involved some degradation of the load carrying capacity of the section is inevitable if service holes are applied. This should be borne in mind when considering this option. 
Corner notching of sections is an automated facility designed to reduce on site modification of members by removing material that might otherwise clash with stanchions or other members. The facility is also used when end flanges are required. Whereas it is primarily intended for use at the ends members may also be notched mid length but consideration must be given to the effect of material removal on section performance. In this regard notching of members mid length is not recommended unless appropriate compensatory measures are taken to ensure section performance is preserved. This also applies to members notched at the ends. Notching involves the removal of rectangular portions of material while the material is still in flat form. The notch starts at the edge of the strip and extends inwards. The following points are applicable in the general case:  
Sigma, Cee and Eaves Beam profiles can be notched. 
Notched Section
The minimum length of notch is 60mm, in theory there is no maximum however controlling straightness and other characteristics of members with extended notches is difficult. The maximum depth that can be removed is half the section depth A member may be notched from either side or from both, if notching from both sides the depth may be different on either side. The notch must start at the edge of the strip i.e. it can’t form a square hole in the member. How to order notched members.
Before specifying notching it is advisable to contact us to discuss your requirements. This way a solution tailored to your specific needs may be devised and confusion or misunderstanding can hopefully be avoided. In the general case the location of notches should be indicated on a drawing of the member. Structural steel detailing systems can automatically define the requirements for notching where such facilities have been put in place.  
End Flange
In situations where loading and other factors permit End Flanges may be used instead of cleats/brackets as a cost effective jointing solution. An end flange is formed from the parent material of the member in question by notching the end and folding the remaining tab. The end flange may be punched to allow for a bolted connection or folded unpunched to act as an end closure. Please note end flanges are available on Cee sections only.
Some points to note:

End Flange direction: End Flanges may be formed inward or outward as indicated in the diagrams below. Flanges folded “IN” are the most commonly used type.  
End Flange Direction
End Flange length: The flange length can be varied to suit the application in question however it is generally less than the width of the section with 50mm being the most common length.  
End Flange Length
Punched or unpunched: End Flanges may be punched for bolting in which case the location of the holes must be indicated. Alternatively flanges may be applied without holes to act as closures at the ends of runs. 
How to order members with End Flanges:

It is advisable to discuss your requirements with the company before ordering, particularly if these have not been ordered previously. For orders being detailed manually drawings are required for members with end flanges. If structural steel detailing systems are being used these can automatically define the requirements for end flanging where such facilities have been put in place.  
Counterforminh Hole Counterforming fixing
Counterforming of either 14 or 18mm holes is a feature that may be specified where it is desirable for bolt heads to finish flush with the face of the member being bolted. This may be relevant in the case of door or window framing where protruding bolt heads could be obstructive. Countersunk head bolts must be used in conjunction with counterformed holes for the feature to be effective. During the process of counterforming the hole is punched to suit the bolt diameter as normal and a secondary process carried out to deform the metal to the desired form.  
Some points to note:

Counterforming is generally applicable to Cee sections only. Please contact Duggan Profiles before considering the use of counterformed holes on sections other than Cee’s as more complex section geometry can lead to complications during manufacture. The geometry of the counterform feature whether 14 or 18mm is such as to allow the head of a countersunk bolt of the relevant size to finish flush with the surface of the member. The overall depth of the counterform varies with material thickness and should be obtained from samples if critically important. Indicative dimensions are shown on the diagram below. Counterforms are formed towards the inside of the profile as standard but may on request be reversed subject to manufacturing capability. Please consult with us before considering this option.  
Tube Struts have recessed ends to allow these fit over counterforms without the need to shorten the strut. Tie Ropes may be fixed directly on top of counterforms. The VCR support rail must be shortened by 6mm if used with counterformed holes and a packer plate used to take up the balance.