No. The 3.6m measurement is the supplied timber length, not a claimed unsupported structural span. Our product data makes no universal span or load claim for the 87 x 38mm MOT rail.
No. The 3.6m dimension on our 3.6m x 87 x 38mm MOT Rail describes the length of timber supplied. It should not be interpreted as approval for a 3.6m unsupported span.
The longer format is useful where a project benefits from fewer joins or where several shorter pieces can be marked and cut from one rail. The product specification explicitly states that no particular structural span or load is claimed simply from the 87 x 38mm section.
The rail therefore needs to be supported according to the completed fencing or framework design in which it is being used. Its stock length and its support spacing are separate considerations.
The same distinction matters when replacing existing timber. Match the 87 x 38mm section as well as the required length, and do not assume an MOT rail is interchangeable with a profiled cant rail or a 75 x 32mm fence-panel backrail.
Other rectangular timber sections can be compared under square rails.