A complete line of SmartRack accessories are available to customize your SmartRack to your application. Designed for easy installation and years of reliable service. SmartRack accessories from Tripp Lite are ideal complements to your SmartRack enclosure or open frame rack system. Fastener Type: 50 x 12 x 0.62 - Rack Screw 100 - Flat Washer. Threads Per Inch (TPI): 24.