National Industrial Supply Co. (NIS). NIS is the national leader in providing quality on-site load testing inspection of lifting slings and associated hardware to ensure our customers maintain safety compliance. NIS is dedicated to providing innovative rigging equipment and services to allow our customers to track and manage all their compliance records online. NIS basis all of its inspection procedures on recognized established standards from OSHA, MIOSHA, ASME/ANSI and ASTM.By offering hosted, on-demand inspection records, NIS takes the hassle and liability away for our customers. NIS takes the worry of marinating and storing our customer's vital inspection and maintenance records so they can concentrate on their core business and maintain a safe, compliant and productive work environment.