Where tolerances matter most
Tolerances are controlled throughout almost every stage of fabrication, but some areas are particularly important:
- Beam lengths and cutting accuracy
- Positioning of bolt holes and connection details
- Plate alignment and weld placement
- Column straightness and vertical alignment
- Base plate sizing and hole spacing
- Camber, twist, or deflection in longer sections
Even small variations in these areas can affect how steel fits together once it reaches site.
Why tolerances matter on site
Structural steel is rarely installed in isolation – it connects with other beams, columns, foundations, and existing building elements. Because of this, accuracy directly affects how smoothly installation progresses.
If tolerances fall outside acceptable limits, they can lead to:
- Bolt holes not lining up during assembly
- Difficult or delayed crane lifts
- Extra time spent adjusting or modifying steel on site
- Misalignment with slabs, walls, or existing structures
On residential projects in particular, where access is limited and installation time is tight, even small inaccuracies can have a noticeable impact on the construction programme.
Fabrication and quality control
Maintaining tolerances is not just about cutting steel accurately – it involves the entire fabrication process. From initial marking and cutting through to drilling, welding, and final inspection, every stage contributes to ensuring the finished steelwork meets specification.
Good fabrication practice also includes regular quality checks to verify that completed steelwork matches the original engineering drawings before it leaves the workshop.
At MAH Steel, every stage of the fabrication process is carefully managed to help ensure structural steel arrives on site ready for efficient installation, with minimal adjustments required.
Related reading:
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We fabricate at our Gravesend workshop and deliver with HIAB lorry crane delivery.
