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Thread Inspection Specialist (TIS)


Course Description:

The ultimate goal is to provide machinists, inspectors and managers with a better overall understanding of threads, why they must be measured and how to properly measure them resulting in better threading practices and a better overall product for the industry. The Candidate is given a brief history of gauge use, a description of how the connections are used, definition and importance of each individual thread element, proper setting and measurement techniques on a variety of gauges across multiple manufacturers and the importance of proper gauging techniques followed by Instructor lead gauging of various threads in both passing and failing conditions.


$ 500.00 $ 379.00

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Certification Overview

The ultimate goal is to provide machinists, inspectors and managers with a better overall understanding of threads, why they must be measured and how to properly measure them resulting in better threading practices and a better overall product for the industry. The Candidate is given a brief history of gauge use, a description of how the connections are used, definition and importance of each individual thread element, proper setting and measurement techniques on a variety of gauges across multiple manufacturers and the importance of proper gauging techniques followed by Instructor lead gauging of various threads in both passing and failing conditions.

E-Course Duration: 45 to 50 hours

Exam Information

  • The exam comprises of 40 Multiple Choice Questions out of which the candidate needs to score 70% (28 out of 40 correct) to pass the exam.

Exams are online and proctored based, using a webcam and a reliable internet connection exams can be taken anywhere and anytime.

  • The total duration of the exam is 1 hour (60 Minutes).

  • No external sources of information may be accessed during the exam via ProctorU. Further details of the materials permitted are provided:
  • Identification Proof

  • If a Candidate does not pass the exam in the second (2nd) attempt, the candidate must wait for a period of at least fourteen (14) calendar days from the date of their attempt to retake the exam for third (3rd) time or any subsequent time.
  • The exam can be taken any number of times.

  • The TIS Certificate is valid for life.

  • N/A

  • N/A

  • Note: The TIS Certification has no pre-requisites.

Course Outline

Module 1 - Thread Length

    • Introduction to Thread Length
    • Thread Length Importance
    • Thread Length Measurement

Module 2 - Thread Height

    • Introduction to Thread Height
    • Thread Height Importance
    • Thread Height Spec Callouts
    • Thread Height vs Thread Addendum
    • Internal Thread Height Measurement Instruction
    • External Thread Height Measurement Instruction

Module 3 - Thread Addendum

    • Introduction to Thread Addendum
    • Thread Addendum Defined
    • Thread Addendum Importance
    • Thread Addendum Measurement
    • Thread Addendum Spec Callouts
    • Internal Thread Addendum Measurement Instruction
    • External Thread Addendum Measurement Instruction

Module 4 - Thread Lead

    • Introduction to Thread Lead
    • Thread Lead Defined
    • Thread Lead Importance
    • Thread Lead Measurement
    • Thread Lead vs Pitch
    • Thread Lead vs PD/Standoff
    • Internal Thread Lead Measurement Instruction
    • External Thread Lead Measurement Instruction

Module 5 - Thread Taper

    • Introduction to Thread Taper
    • Thread Taper Defined
    • Thread Taper Importance
    • Thread Taper Measurement
    • Thread Taper Spec Callouts
    • Thread Taper vs Standoff
    • Thread Taper Degree & Callouts
    • Internal Thread Lead Measurement Instruction
    • External Thread Lead Measurement Instruction

Module 6 - Thread Pitch Diameter

    • Introduction to Pitch Diameter
    • Pitch Diameter/Crest Diameter Defined
    • T&C Pitch Diameter Importance
    • T&C Pitch Diameter Measurement
    • Pitch Diameter Spec callouts
    • Internal Thread Lead Measurement Instruction
    • External Thread Lead Measurement Instruction

Target Audience

  •  This Certificaiton is intended for both new and experienced thread inspectors.
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