The contract will see a mixture of one-, three-, six- and nine-tonne Terex dumpers delivered by the end of April 2015.
The order is nearly 10 times higher than any other placed for dump trucks in Northern Ireland over the past six years.
Sleator Plant general manager Jonathan Campbell said: “We’re absolutely thrilled to have won such a huge order, which delivers a massive year-on-year increase in volume for Terex in Northern Ireland. A sign of the recovering economy and the quality of the Terex product, this is a great story for the manufacturing and construction industries.”
CP Hire managing director Andrew Hutchinson said: “With a wide range of high-quality site dumper models available on short lead times, Terex was the obvious choice for us.”