Browse Learn C1733

Fundamentals of Threaded Fasteners C1733

Fastener experts believe that upwards of 95% of all fastener failures are the result of either the wrong fastener for the job or improper installation. Whether this shocking figure is accurate or not, it is irrefutable that threaded fasteners are poorly misunderstood by many in both the fastener and user communities. In October 1990 the USS Iwo Jima suffered a catastrophic steam valve accident minutes after leaving port following repairs to its steam plant. In one of the single most deadly events of Operation Desert Storm, ten of the eleven crewmen present in the engine compartment would lose their lives. It was later discovered that this accident was the result of improperly chosen fasteners.

Students in this course will explore the basics of threaded fasteners, what purpose specific product design features address, the importance of proper material choices, and the function of platings and coatings.  This course will introduce participants to basic fastener engineering principles and explain why tension is all-important in the bolted joint, the relationship between torque and tension, how screws can be used to form their own internal threads, and new technologies and practices being deployed by automotive manufacturers to achieve lighter weight products. This course will include a segment on joining technologies that enable automotive designers and manufacturers to succeed in their light weighting activities. Many of these technologies are relatively new and state-of-the art.

Learning Objectives
By attending this seminar, you will be able to:
  • Distinguish the different characteristics of threaded fasteners and in what situations/applications those characteristics should be deployed
  • Explain the relationship between torque and tension in a bolted joint
  • Differentiate various tightening strategies and assess the most appropriate for specific assembly operations
  • Distinguish between different material choices and how associated unique material properties lend the designer to use one material over another
  • Explain how high strength fasteners are achieved
  • Evaluate the many plating and coating options available for fasteners and make choices that provide the user the greatest amount of value and utility.
  • Explain the difference between a traditional bolted joint and a joint formed by a thread forming fastener. You will be able to distinguish fundamental differences between the fastener engineering that goes into thread forming in different materials
  • Evaluate difficult joining scenarios posed by new assembly challenges and assess and apply new joining technologies that will successfully provide a solution

Who Should Attend

This is a basic course and will best be received by those wishing to gain a broad and basic understanding of the topic. It would be very appropriate for both engineers and non-engineers that are in a technical or semi-technical role, who either use, design-in, or provide others with guidance related to fasteners.  It would be appropriate for individuals that are new to the industry, have recently moved to a role that requires basic knowledge of fasteners and fastener engineering, or have been in the industry for a while but have never received formal education on fasteners or wish to improve their knowledge of fasteners. This course is NOT for the engineer or designer expecting an in-depth education on designing or understanding the engineering parameters of a bolted joint.  While having some limited experience with fasteners and industry terminology will be helpful to the participant, it should not be a prerequisite or deterring factor that would prevent an individual from taking this course. However, if an individual has no knowledge of fasteners or fastener related terminology and struggles understanding basic mechanical concepts, there may be sections of this course that they find difficult to follow or understand.


This is a basic course well-suited for individuals just beginning to work in the area of threaded fasteners so no educational prerequisites are necessary. However, individuals with some prior experience with threaded fasteners and knowledge of fastener terminology will find this course easier.

Day 1

  • Introductions
    •  Subject Assessment
    • Discussion of specific participant requests/questions
  • Basics of Fastener Engineering
    •  Considerations when designing a threaded joint
    • Tension versus shear joints
    • The Bolted Joint
      •  As a spring member
      • Hard versus soft joints
      • Hooke"s Law
      • Pre-tension/Load
    • Torque Tension Relationship
      •  Is Torque important?
      • Effect of friction (head and thread)
      • T=kDP
      • Effects of lubrication and other surface related conditions
    • Tightening Strategies
      •  Torque Control
      • Turn of nut
      • Torque/Angle Control
      • Torque/Angle/Yield
      • Ultrasonic Technology
    • Loss of tension/Locking Fasteners
      •  Prevailing torque
      • Locking versus prevailing torque features
      • On externally threaded fasteners
      • On internally threaded fasteners
    • Thread Forming Screws
      •  Drive and failure torque behavior
      • Components of driving torque
      • Developing a Tightening Torque
      • Driver repeat accuracy
    • Special Considerations in Thread Forming
      •  Fastening into Plastics -- Stress sensitivity; Hoop Stress; Relaxation; Boss Design; Driving Speed
      • Fastening into Steel
      • Fastening into Aluminum
      • Fastening into Light Metals
    • Joining to Enable Lightweighting
      •  Challenges
      • Fastening Thin Sheets
      • Joining Aluminum
      • Joining Dissimilar Materials
      • Carbon Fiber Reinforced Plastics
      • Joining Technologies - Baseline/Traditional Technologies; Flow Drill Screwing; Friction Element Welding; Self-Piercing Rivets; Clinch Technologies
Day 2

    • Fastener Failure
      •  Installation
      • Corrosion
      • Hydrogen Embrittlement
      • Torque or Tension Overload
      • Fatigue
    • Manufacturing Flaws -- Surface discontinuities
  • Threaded Fastener Product Basics
    •  How Fasteners are made - Video
    • Fastener Design Basics -- Design discussion- what are you designing for?
    • Screws and Bolts
    • Threads
    • Nuts
    • Washers
    • Fastener Materials
    • Heat Treating Fasteners
    • Plating and Coatings
  • Wrap-up

Registration for the web seminar (live, online) is available on a per-person basis, similar to purchasing a seat in a classroom. The fee includes one connection to WebEx training center, using a PC with internet access and VoIP or a telephone,* and access to a secure course in the SAE Learning Center for presentations, supplemental materials, assignments, and learning assessment. To enjoy a more personalized experience, use of a webcam is encouraged.

*Global toll-free telephone numbers are provided for many countries outside the U.S., but are limited to those on the WebEx call-in toll-free number list. Check here to see if your country has a global call-in toll free telephone number for this web seminar. If your country is not listed, you may still connect using the US/Canada Call-in toll number or VoIP. 

Although WebEx will automatically launch when you join the web seminar, you are encouraged to test your setup in advance of the course start date. Click here, then follow the onscreen instructions.

Laurence Claus

Laurence Claus Laurence Claus is President of NNi Training and Consulting Inc., provides training and consulting services to the fastener and automotive supply industry. Prior to forming NNi, he was Vice President of Engineering for a Midwest automotive fastener manufacturer. Laurence has worked in the fastener industry since 1988. He holds a Bachelor of Science in Mechanical Engineering from the University of Illinois and is also a Certified Six Sigma Black Belt. Laurence is Chairman of the SAE Fastener Committee; Subcommittee Chairman of ASME B18.6 and ASTM F16.91; a member of ASME B18, ASTM F16, and ISO TC 2. He is the Director of Training with IFI and the author of numerous fastener journal articles and technical papers.


Hotel & Travel Information

Fees: $1415.00
SAE Members: $1274.00 - $1274.00

1.3 CEUs
You must complete all course contact hours and successfully pass the learning assessment to obtain CEUs.

If paying by a credit card, click the Register button above. If paying by any other method or for general inquiries, please contact SAE Customer Service 1-877-606-7323 (724-776-4970 outside the U.S. and Canada) or at

Duration: 2 Days
September 1-2, 2020 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan

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