Archives: Hobbies and Projects

“Fastener Wars”: Metric and SAE Fasteners in the Auto Industry

We probably take fasteners—nuts and bolts—for granted until we reach into our toolbox for the right socket wrench for the engine bolt we want to remove. Do we need an SAE socket or a metric one? If we pick the wrong one, it may not work as expected. In fact, if we pick the wrong one, it may just slip around the nut or the bolt head without getting any traction at all. We also run the chance of using say an SAE bolt as a replacement with a metric-threaded nut or hole—or vice-versa.

Why is there a difference? Why have both SAE and metric nuts and bolts been used on American cars over the years? And what’s the situation now and in the future?

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Metric Property Classes vs. Imperial Grades

A fastener’s strength is determined by two primary factors: 1) the material it is made from, especially the percentage of hardening carbon in the steel, and 2) the process used to create it – usually heat treatments such as tempering, galvanizing, annealing, and quenching. Treating steel fasteners to harden them necessarily reduces their ductility. Bolts, nuts, and screws can be made to fulfill tasks that require specific strengths and ductility, and identifying these properties aids contractors and manufacturers in selectig the right fastener for the job.

Metric Property Classes vs. Imperial GradesGrades and Property Classes

Metric fasteners adhere to strength ratings, or Property Classes, mandated by the International Standards Organization (ISO). Imperial, or SAE fasteners’ ratings, or Grades, are assigned by the American Society for Testing Materials (ASTM). Grades and classes are denoted by markings on the heads of externally threaded hardware and the sides or faces of internally threaded parts: Continue reading

The Metric Fastener Supplier for 3D Printers

A Mr. Metric customer, Cody Schmidt used a variety of metric fasteners to modify and upkeep his Lulzbot Taz5 3D printer. When he found a modification plan online that he wanted to implement he realized the adjustments needed for the job required very specific bolt sizes that most providers did not offer as they are hard to find or extremely rare.

Cody was very pleased when he learned that Mr. Metric carries a large range of specialty sized bolts, including the exact ones he was looking for. Cody stated:

“The most awkward size bolt I have ever used was used here too. A lonely m3x60mm bolt. But what I learned most importantly was that when reordering some parts, the shipping speeds here help big time.” Continue reading

When Can Metric Fasteners Be Reused?

Depositphotos_7100718_s-2015When looking for ways to reduce waste, cost-conscious and environmentally aware manufacturers and consumers may consider reusing metric bolts and screws. But not all bolts and screws can be safely and effectively reinstalled after being removed from an assembly or component. In fact, an unequivocal “yes” is never the answer to the question of whether a fastener can be reused. Depending on the situation, the answer is always either “no” or “it depends.”

No

High-strength bolts that have been pre-tensioned into their proof load range – the point at which they permanently deform and do not “snap back” when relieved from their loads – should not be reused. This is the case in many applications, as structural and other bolts used in the manufacturing, construction, and automotive industries are commonly tightened to a torque value that creates a sufficient clamp force to prevent joint failure.

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Homemade D-Bot 3D Printer Kit Assembled with Hard to Find Metric Fasteners

D-Bot Printer with fasteners 2As the revolution in desktop 3D printing for professional and educational sectors continues to grow, the demand for these printers is spreading to the consumer for home use. Individuals operating with a tight budget tend to select 3D printer kits as an entry-level option. The kits require you to assemble the printer and purchase the necessary hardware.

When researching homemade digital 3D printer kits online, you will find all sorts of information posted on blog and forum sites, as well as “how-to” videos on YouTube.  In the Thingiverse community, you can learn how to construct your own D-Bot CoreXY 3D printer. The site provides step-by-step instructions, along with the list of components and hardware needed to assemble the printer. Continue reading

Understanding & Applying Proper Torque for Metric Fasteners

Torque Explained

Tightening a nut onto a bolt causes the bolt to stretch slightly. Much like a spring, the bolt resists this stretching, and its tendency to return to its natural state creates clamping action between, say a cylinder head and a manifold, or two pieces of sheet-metal housing.

It is critical to the component’s operation that the amount of tension created holds the parts together strongly enough to prevent their separation by outside forces such as the machine’s vibration, the load stress generated during operation, gasket creep, temperature fluctuations, and more. Too much torque, however, can stretch the fastener too much, to the point where it chips, breaks, or yields. Bolts and screws are rated by their “proof load” – how much tension they can withstand before they fail. As a rule of thumb, torque a “clamp load” (also known as “preload”) 75 percent to 90 percent of the proof load is optimal.

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Torque Relationship Chart

 

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Finding the Right Metric Nut is No Easy Task

With all of the nuts in the world, it can be hard to figure out which one is right for your assembly. To help you along with selecting the proper product for your project, here’s a brief rundown of some of the most common metric nuts and their applications.

  1. Metric All Metal Nuts
    alll metalThese general purpose nuts are commonly found on cars, farming machinery, and in metal working industries. They’re very tough, reusable, and provide a solid connection.

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Maintain Your Bike & Ride Smoothly with Metric Fasteners

bikeSpring is in the air, and that means a lot of people will be dusting off their bicycles and heading out for long rides. The question is, are those bikes ready for another season of two-wheel adventures? Worn or loose fasteners and bolts can turn a pleasant ride into a nightmare. Before hopping on your bike, make sure it’s up to the task.

A bicycle is made up of a surprising number of parts. All of those parts are held together by various metric bolts and washers. If any one of those metric fasteners are worn or incorrectly sized, parts can come loose and you may be at risk for injury. Here, we’ll take a look at some of the most important systems of a bicycle, and the most common metric fasteners used by those systems.

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The Different Metric Machine Screw Heads and Their Uses

metic machine screwWhen it comes to keeping things together, engineers, designers, and builders overwhelmingly choose metric machine screws. They’re in everything from kitchen cabinets to deep-space probes. Given the wide variety of things put together with metric machine screws, it’s no surprise that there is such a wide variety of metric screws to choose from. Learn about the different types of metric machine screws and when to use them.

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ISO 9001:2008 Certification: What it Means to You

The establishment of the International Organization for Standardization (ISO) is based on the need to facilitate international trade by promoting development of universal standards. Having been in place for over a decade now, the ISO 9001:2008 Certification is a universal method used by both customers and companies to control the quality of output.

ISO-Certified-Co-Logo-BlueIt is a framework of business management ensuring continued improvements in all aspects of the business. The external assessment on a regular basis ensures maintenance of these business practices.

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