Amphenol Sine Systems AHD & AT/ATP Series™ Connectors Amphenol SINE Systems AHD & AT/ATP Series™ Connectors were developed as a heavy duty, high-performance, cost-effective solution for use with Heavy Equipment, Agricultural, Automotive, Military, Alternate Energy, and other demanding interconnect architectures. The product line's AT Series™ is designed to be compatible with all other existing standard products industry-wide, and the AHD Series™ is intermateable to industry standard 6- and 9-pin connectors. Amphenol also offers end caps, contacts, and accessories designed specifically for use with AHD & AT/ATP Series™ Connectors. Learn More