DTI TECHNICAL DATA SHEET DTI SmartBolts® are tension indicating fasteners designed for use your most important bolted joints. SmartBolts® ensure proper preloading of these bolted joints with its Visual Indication System. The Visual Indication System also makes monitoring of in-service tension straightforward and eases maintenance of bolted joints. DTI Visual Indication System • The DTI Verification Guide - The Verification Guide is a calibrated color scale that enables accurate comparison and measurement of the indicator’s color during installation and inspection. • The DTI Visual Indicator - The indicator of the DTI SmartBolt measures actual fastener elongation and converts this deflection in to a distinct color change. The color of the indicator gives a continuous real-time signal to the observer.

DTI TECHNICAL DATA SHEET Engineering Design Process The SmartBolt engineering design process begins with the Product Request Form. This form is used to gather all of the specifications related to the bolt and bolted joint as well as expected customer demand. Industrial Indicators then analyzes the feasibility of the customer’s request and recommends a unique SmartBolt design to match the customer requirements. During the application analysis, information on design tension, bolt tensile and shear strength, installation requirements, and environmental considerations are gathered and recorded. The...

DTI TECHNICAL DATA SHEET • Finish – Describes the coating applied to base materials in order to provide enhanced properties, such as increased corrosion resistance. o Plain – Bare metal and may or may not have a coating of light oil to resist corrosion, generally provided with a cosmetic black oxide finish. o Clear Zinc – Electroplated Zinc with clear trivalent Chromate finish. Provides better corrosion protection than Plain. o Yellow Zinc – Electroplated Zinc with yellow hexavalent Chromate finish. Provides better corrosion protection than Clear Zinc but is not RoHS compliant. Thread Length...

DTI TECHNICAL DATA SHEET • Modified Ultimate Tensile Strength – The maximum tensile force after modification the SmartBolt can withstand before fracture. The ultimate tensile strength is usually the same as the original tensile strength except in cases of reduced strength (see question on strength under the FAQ section). DTI SmartBolts: Frequently Asked Questions Q) What range of indicating tensions are available? A) In general, customers are able to request indicating tensions from 30 – 90% of the fastener proof load in increments of 5%. Indicating tensions beyond this range are assessed on...