Air Shafts • Air Chucks • Mechanical Shafts & Chucks • Air Roll Lock Differential Shafts *Delivered in just a few weeks* Since 1978 Convertech has provided the wide and narrow web industry with reliable, high-quality expanding shafts and chucks with the fastest lead-time in the industry. Our focus on customer service creates an environment of inspiration and innovation which we pass to our customers through superior and cost-effective product design.