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A type of fastener consisting of a head and a screw (cylindrical body with external threads), which needs to be matched with a nut and used to tighten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, it can separate these two parts, so bolt connection is a detachable connection.
1. Bolt:
A type of fastener consisting of a head and a screw (cylindrical body with external threads), which needs to be matched with a nut and used to tighten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, it can separate these two parts, so bolt connection is a detachable connection.
2. Screw:
A type of fastener consisting of a head and a screw, which can be divided into three categories according to its purpose – machine screws, set screws, and special purpose screws. Machine screws are mainly used for fastening a part with an internal threaded hole to a part with a through-hole, without the need for a nut to fit (this type of connection is called a screw connection, which is also a detachable connection; it can also be used with a nut to tighten the connection between two parts with through-holes. Tightening screws are mainly used to fix the relative position between two parts. Special purpose screws include lifting eye screws for lifting parts.
316 corrosion-resistant stainless steel is the best material, followed by 304. Next is carbon steel, which is also the most commonly used material.
3. What are the standards and uses of hexagonal nuts
As a standard component, nuts and pop rivets have their own standards. Used for distinguishing and connecting and their purposes.
For hexagonal nuts, commonly used standards include:
GB41 Type I Hexagon Nut – Grade C
GB6170 Type I Hexagon Nut – Grade A and B
GB6171 Type I Hexagon Nut – Fine Teeth – Grades A and B
GB6172 Hexagon thin nuts – grades A and B – chamfered
GB6173 Hexagon thin nuts – Fine thread – Grade A and B
GB6174 hexagonal thin nuts – Grade B – without chamfer
GB6175 Type II Hexagon Nut – Grade A and B
GB6176 Type II Hexagon Nut – Fine Teeth – Grade A and B
GB6177 Hexagon flange nuts – Grade A
GB55 hexagonal thick nut
GB56 hexagonal ultra thick nut
GB1229 large hexagonal nut (high-strength for steel structures)
1. Ordinary hexagonal nuts: widely used, characterized by a relatively large tightening force. The disadvantage is that there needs to be sufficient operating space during installation. Monkey wrenches, open end wrenches, or eyeglass wrenches can be used during installation, all of which require a large operating space.
2. Cylindrical head hex nut: It is the most widely used among all screws because it has a relatively large tightening force and can be operated with an hex wrench. It is easy to install and is almost used in various structures. The appearance is relatively beautiful and neat. The disadvantage is that the tightening force is slightly lower than the outer hexagon, and repeated use can easily damage the inner hexagon and make it impossible to disassemble.
4. Headless hexagon nut: It is necessary to use it on certain structures, such as top screw structures that require a large tightening force, or places where the cylindrical head needs to be hidden.
5. Countersunk hex nuts: mostly used in power machinery, their main function is the same as that of hex nuts.
6. Nylon locking nut: a structure with nylon rubber rings embedded in the hexagonal surface to prevent thread loosening, used in strong power machinery.
7. Flange nuts: mainly used to increase the contact surface with the workpiece, and are mostly used in pipelines, fasteners, as well as some stamped and cast parts.