Mechanical Properties of Materials For Threaded Fasteners

Dec. 23, 2024

Mechanical Properties of Materials For Threaded Fasteners

Threaded fasteners are crucial in any design work. They&#;re used to hold components together. But getting quality fasteners can be a chore unless you pay attention to the mechanical properties of materials your fasteners possess.

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The mechanical properties of materials define how your threaded fasteners behave when they&#;re subjected to external forces known as loads. For joint designing, fasteners are covered by criteria and specifications that define the required mechanical properties of materials such as

Strength.
Toughness.
Hardness.

And studies show that the best-threaded fasteners should not only be able to hold devices down during operational loads but should also be able to withstand extreme loads, too.

We've put together this list to help you better understand what you should be looking for. It breaks down some of the most important mechanical properties of materials when designing threaded fasteners.

Important Mechanical Properties for Threaded Fasteners

1) Tensile Strength

Tensile strength vs yield strength. It's an age-old debate. But which stands out when it comes to threaded fasteners? Tensile strength is stress measured as force per unit area. It&#;s the maximum load that a material can support without fracture when under tension. Threaded fasteners are tested on tensile testing machines to validate tensile properties that meet the appropriate strength grade. When buying threaded fasteners, you want to check SAE J429 (imperial sizes) and ISO 898-1 (Metric sizes) to determine the required mechanical properties for your project.

2) Yield Strength

Materials are often deformed when some level of stress is applied to them. So, the best way to know how much a material can yield before it&#;s permanently deformed is to check its yield strength. A bolt&#;s yield strength is defined as the tensile force that causes a certain amount of permanent deformation within a fastening.

3) Proof Load

The proof load is the maximum tensile force applied to a bolt without causing plastic deformation. The optimal material proof load should be between 85% and 95% of its yield strength.

4) Hardness

The University of Southampton defines hardness as the resistance of a material to localized plastic deformation. Hardness varies from one material to another. Some of the hardest materials are diamonds and boron-carbide. On the other hand, plastic is considered a soft material.

5) Shear Strength

When looking for threaded fasteners, product designers should always be cautious. The ability of a material to resist forces that cause its internal structure to slide against itself is known as shear strength. For lifespan, the ideal ones should have a high shear strength.

Shear strength is often measured horizontally, in single or double shear. Two blades with centrally positioned transverse holes are used in a single shear test. One blade holds the fastener in position while the second blade shears the fastening in a parallel plane. In double shear testing, second stationary blade support is placed behind the shearing blade.

Threaded Fasteners |The Bottom Line

Fasteners for joint design are covered by standards that define required mechanical properties. Making the right choice of threaded fasteners can save you money in the long run because they will stand up to the pressure.

Big Bolt manufactures high-quality ISO and ASTM standard fasteners. If you&#;re looking to shop for some, we&#;ve got you covered. With experience in service industries like aerospace, agriculture, construction, industrial, and maritime, be sure to contact us if you have any questions about your next project.

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21 Nut Types Everyone Should Know

AlbanyCountyFasteners.com has been in the industry for a while. This means we&#;ve encountered countless customers seeking guidance on selecting the right nut for their projects. It&#;s not just about choosing any threaded fastener &#; each nut type serves a specific purpose. Understanding the 21 nut types everyone should know is crucial for both professional and personal projects. In this comprehensive guide, we&#;ll break down these essential nut varieties you might encounter in your work.

We&#;ve created a handy reference guide to help you visualize these different nut types. The image below showcases each of the 21 nut types everyone should know, along with a brief description. The guide is also available in a printable PDF. Feel free to save or print this guide for quick reference in your workshop or on job sites.

Fastener Nut Types Guide (PDF)

Now, let&#;s explore each of these nut types further, diving into their unique features and common applications.

Common Varieties

Hex Finish Nut: This standard six-sided nut is the most common type for general-purpose fastening. Its shape allows for easy tightening with a wrench.
Acorn (Cap) Nut: Also known as a cap nut, it features a domed top that adds a finished look while protecting the bolt threads from damage and exposure.
Flange Nut: This nut comes with a built-in washer flange, which distributes the load over a larger area and eliminates the need for a separate washer.

Specialized Types

Coupling Nut: Designed with internal threads, this long nut joins two male-threaded rods or bolts, allowing for extended length connections.
T-Nut: Featuring a pronged body, T-nuts embed into wood or soft materials, creating a strong threaded insert for receiving bolts or screws.
Wing Nut: Recognizable by its &#;wings,&#; this nut allows for easy hand-tightening, making it ideal for applications requiring frequent assembly and disassembly.

Security-Focused Nuts

Castle Nut: With slots cut into its top, this nut is designed to work with a cotter pin, preventing loosening in critical applications.
Nylon Insert Lock Nut: This nut contains a nylon insert that grips the bolt threads, effectively preventing loosening due to vibration.
Tri-Groove Nut: Featuring a tapered diameter with three grooves, this nut requires a special tool for installation, enhancing security in sensitive applications.

High-Strength Options

Heavy Hex Nut: Larger and thicker than a standard hex nut, this type is designed for high-strength applications where standard nuts may not suffice.
Structural Hex Nut: These extra-thick, high-strength nuts are specifically designed for use in critical steel-to-steel structural connections.

Space-Saving Solutions

Hex Jam Nut: Thinner than standard hex nuts, jam nuts are ideal for locking nuts in place or for use in applications with limited space.
Nylon Insert Jam Lock Nut: This low-profile nut combines the space-saving design of a jam nut with the locking capabilities of a nylon insert.

Efficiency-Enhancing Types

Keps (K-Lock) Nut: This nut comes with an attached, free-spinning lock washer, streamlining assembly processes by combining two components.
Knurled Thumb Nut: Featuring a textured edge, this nut is designed for easy hand-tightening in applications where tool use is impractical.

Industrial Varieties

Hex Machine Screw Nut: Smaller than standard hex nuts, these are specifically designed for use with machine screws under 1/4&#; diameter.
Weld Nut: As the name suggests, this nut is designed to be welded to a surface, creating a permanent threaded attachment point.
Prevailing Torque Lock Nut (Stover): This all-metal locking nut is suitable for high-temperature applications where nylon inserts would fail.

Unique Designs

Square Nut: They have four sides instead of six. Square nuts provide greater surface contact and resistance to loosening in certain applications.
Slotted Hex Nut: They are similar to castle nuts but with a lower profile. These nuts have slots for use with cotter pins in securing connections.
Break Away (Shear) Nut: Engineered to shear at a specific torque, these nuts provide tamper-resistance after installation.

At AlbanyCountyFasteners.com, we understand that selecting the appropriate nut is crucial for the integrity and safety of any fastening application. The right choice can mean the difference between a secure connection and potential failure.

We&#;ve been assisting professionals across various industries in finding the perfect fastener solutions for their projects. Whether you&#;re working on construction, manufacturing, or specialized applications, we have the expertise and inventory to meet your fastening needs.

If you find yourself unsure about which nut type best suits your project requirements, don&#;t hesitate to reach out. Our team at AlbanyCountyFasteners.com is always ready to provide expert advice and help you make informed decisions.

Remember, the right nut isn&#;t just about holding things together &#; it&#;s about ensuring safety, efficiency, and longevity in your work. Trust in our experience to guide you to the best fastening solutions for your projects.

Don&#;t forget to keep our visual guide handy! it&#;s a great quick reference when you&#;re in the field or discussing projects with colleagues. And of course, for any questions or specialized fastener needs, AlbanyCountyFasteners.com is just a click or call away.

If you are looking for more details, kindly visit Double Head Screw Nut.

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