What are high strength bolts used for?
High strength bolts or structural bolts are made to be used with heavy hex nuts to connect structural members. To be considered a structural connection, it has to conform to specific ASTM standards; specifically, ASTM A563 or ASTM A194. Structural bolts are also categorized by grades.
What is a high strength bolt?
High Strength Bolts For Structural Bolting Bolts are fasteners with external threads designed for driving through holes in assembled parts. These fasteners are tightened or released through torqueing a nut. High strength bolts are made from high-strength carbon steel or from tempered alloy steel.
What is a bolt used for in construction?
In general, construction bolts are used to create joints between structural elements or to install them into a surface or material. In some cases, bolts are meant to be a permanent part of a structure, meaning that once they are installed they cannot be shifted and require no further maintenance or replacement.
How is a high strength bolt identified?
The higher the grade, the stronger the bolt. English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade. So, for example, a grade 5 bolt will only have 3 radial lines on its head.
What are the strongest bolts made of?
The strongest commercial-quality bolt is grade 8, marked by six raised dashes; its medium-carbon alloy steel has been quenched and tempered to achieve a tensile strength of 150,000 psi.
What is the difference between a common bolt and a high strength bolt?
Ordinary bolts are generally made of ordinary steel (Q235) and only need to be tightened. Ordinary bolts are generally 4.4, 4.8, 5.6 and 8.8 class. High-strength bolts are generally 8.8 and 10.9 class, of which 10.9 class are mostly. The screw holes of ordinary bolts are not necessarily larger than high-strength bolts.
What are high strength friction grip bolts?
High strength bolts: The bolts that are tightened to develop some initial tension are known as high strength friction grip bolts. The bolts are tightened until they have very high tensile stresses so that the connected parts are tightly clamped together between bolt head and nut.
Where are bolts used?
Bolts are typically used to hold materials or objects together, or to position objects. The chamfer at the opposite end of the head provides a slightly bevelled edge which helps with inserting the bolt into holes and nuts.
What is high strength friction grip bolts?
Introduction: High Strength Friction Grip Bolts (HSFG) bolts are high strength structural bolts. which have been tightened such as to induce tension in the bolt shank. Due to the tension in the. bolt, the interface between the plies (steel members in a joint) cannot move relative to each.
What is the strongest metal for bolts?
How do high strength friction grip bolts work?
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.