What are high strength friction grip bolts?

Here at Steelo, we are always making use of different types of bolts for different situations. Most of the time we use standard hexagonal bolts but we also use counter sunk bolts, hollobolts and HSFG bolts.

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How they work

HSFG stands for High Strength Friction Grip and as the name suggests they make use of friction. Where a traditional bolt will stop the plates in a connection from moving apart by supporting the weight on the bolt shank in the form of shear stress, an HSFG supports the weight by clamping the plates so tightly together that they can't slip past each other.

In other words, the friction generated between the plates is equal to the force being put on the plate by the weight of the beam it supports.

To make sure that the plates don't slip past each other, the bolt needs to be carefully preloaded. The area around the bolt needs to be clean and unpainted (which we make sure of whenever we use HSFG bolts), and the bolt then needs to be tightened to a precise level.

In general, we include a DTI (Direct Tension Indicator) with the HSFG bolts that lets you know when the right tensions been reached. (The little bumps on the DTI will be compressed as the tension increases).

Why we use them

We don't use HSFG bolts often because they're expensive and in most cases, they aren't needed. There are a few cases when they should be used, most commonly for us here at Steelo, in splice connections. If it's important that there is no slip between plates in your splice connection then we can use HSFG bolts to achieve that.

HSFG bolts are also commonly used in structures that will be exposed to a lot of vibrations, or loadings that will reverse. Since the bolts are preloaded the tension in the bolt doesn't vary as much as in a standard bolt, so they don't fatigue as quickly. They also will prevent any slip between the plates, which means your fastener won't come loose.

In practice

If you find yourself in need of HSFG bolts we will be happy to order them for you. They are more expensive and the lead times are a bit longer but for some applications, it's worth having them. Just make sure they are carefully pretensioned according to manufacturer's instructions and only used once!

For more Friction Boltinformation, please contact us. We will provide professional answers.

If you want to ask any questions about HSFG bolts, we will be happy to advise!

Bolts are ubiquitous in construction and engineering, serving as crucial components in securing structures and machinery. Within this realm, high-strength friction grip bolts stand out as a specialized category of fasteners known for their exceptional durability and reliability. It is imperative to distinguish between high-strength friction grip bolts and ordinary bolts to ensure optimal usage in diverse applications. This article delves into the nuances that set high-strength friction grip bolts apart from ordinary bolts, shedding light on their material composition, strength characteristics, tightening methods, and application scenarios.

What are High-Strength Friction Grip Bolts and Ordinary Bolts

What are High-strength Friction Grip Bolts

High-strength friction grip bolts (HSFG bolts) are a type of bolt that is designed to provide a high-strength connection between two or more steel plates. HSFG bolts are made from high-strength steel and are tightened to a specific pre-tension load. This pre-tension load creates a clamping force between the plates, which prevents them from slipping past each other.

What are Ordinary Bolts

Ordinary bolts are a type of bolt that is used for general-purpose applications. Ordinary bolts are typically made from lower-strength steel than HSFG bolts and are not tightened to a specific pre-tension load.

Why is it Important to Understand the Differences Between High-strength Friction Grip Bolts and Ordinary Bolts?

It is important to understand the differences between high-strength bolts and ordinary bolts because they are designed for different applications. HSFG bolts are designed for high-strength applications, such as bridges, buildings, and heavy machinery. Ordinary bolts are designed for general-purpose applications, where high strength is not required.

Differences Between High-strength Friction Grip Bolts and Ordinary Bolts: A Comprehensive Comparison

High-strength friction grip (HSFG) bolts and ordinary bolts are two types of fasteners that are used in a wide variety of applications. HSFG bolts are designed for high-strength and reliability applications, while ordinary bolts are used for general applications where high strength is not required.

The following table summarizes the key differences between HSFG bolts and ordinary bolts:

CharacteristicHSFG boltsOrdinary boltsMaterialHigh-strength steel alloys (e.g., 45# steel, 20MnTiB steel, 35CrMoA steel)Lower-strength steel alloys (e.g., Q235 steel)StrengthTensile strength: MPa Shear strength: 730 MPaTensile strength: 480 MPa Shear strength: 320 MPaTightening methodMust be tightened to a specific pre-tension load using a torque wrenchCan be tightened using a wrench or socket wrenchApplicationsHigh-strength and reliability applications (e.g., bridges, buildings, heavy machinery, aircraft, ships)General applications where high strength is not required (e.g., furniture, appliances, electronic devices, general construction)

Detail Applications of HSFG Bolts and Ordinary Bolts

HSFG bolts are used in a wide range of applications where high strength and reliability are required. Some of the most common applications include:

• Bridges: HSFG bolts are used to connect the various structural members of bridges, such as the beams, girders, and trusses. The high strength of HSFG bolts is essential for ensuring that bridges can safely carry the heavy loads that they are subjected to.
• Buildings: HSFG bolts are used to connect the structural members of steel-framed buildings, such as the columns, beams, and floors. The high strength and reliability of HSFG bolts are essential for ensuring that buildings can safely withstand the loads imposed by wind, earthquakes, and other hazards.
• Heavy machinery: HSFG bolts are used to connect the various components of heavy machinery, such as cranes, excavators, and bulldozers. The high strength of HSFG bolts is essential for ensuring that heavy machinery can safely lift and move heavy objects.
• Aircraft: HSFG bolts are used to connect the various components of aircraft, such as the wings, fuselage, and engine. The high strength and reliability of HSFG bolts are essential for ensuring that aircraft can safely fly and carry passengers and cargo.
• Ships: HSFG bolts are used to connect the various structural members of ships, such as the hull, decks, and superstructure. The high strength of HSFG bolts is essential for ensuring that ships can safely withstand the forces of the ocean.

Ordinary bolts are used in a wide variety of general applications where high strength is not required. Some common applications include:

• Furniture: Ordinary bolts are used to assemble furniture, such as chairs, tables, and beds. The strength of ordinary bolts is sufficient for these applications, and they are also relatively inexpensive and easy to use.
• Appliances: Ordinary bolts are used to assemble appliances, such as refrigerators, washing machines, and dishwashers. The strength of ordinary bolts is sufficient for these applications, and they are also relatively inexpensive and easy to use.
• Electronic devices: Ordinary bolts are used to assemble electronic devices, such as computers, televisions, and smartphones. The strength of ordinary bolts is sufficient for these applications, and they are also relatively small and lightweight, which is important for electronic devices.
• General construction: Ordinary bolts are used in a wide variety of general construction applications, such as framing houses, building decks, and installing fences. The strength of ordinary bolts is sufficient for these applications, and they are also relatively inexpensive and easy to use.

Conclusion

In summary, high-strength friction grip bolts stand as exemplars of engineering precision and durability. Their composition of high-strength materials, superior strength characteristics, and precise tightening methods set them apart from ordinary bolts. This differentiation makes them indispensable in projects where structural reliability is of paramount importance. Understanding the nuances between high-strength friction grip bolts and ordinary bolts is crucial in ensuring the safety and longevity of structures and machinery. As we continue to push the boundaries of engineering, the reliance on specialized fasteners like high-strength friction grip bolts will undoubtedly become even more pronounced, further underscoring their significance in the world of construction and engineering.

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