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The main gaskets include flat gaskets, spring gaskets, anti-loose gaskets, seal gaskets and special-shaped gaskets for other purposes.
1. Flat washer
Flat pads are thin pieces for reducing friction, protecting the connecting surface or dispersing pressure. Flat washer is mostly made of flat metal rings, and its application is mainly aimed at reducing friction, isolating and dispersing pressure. What are the common flat gaskets? Fasteners mostly involve flat gaskets, such as ordinary flat gaskets DIN 125A /ISO 7089/ GB 97.1, chamfered flat gaskets DIN 125B /ISO 7090/ GB 97.2, C-class flat gaskets DIN126/ ISO 7091/GB 95, large outer diameter washers DIN9021/ISO 7093/GB 96.1.
There are differences in hardness performance of flat pads of different standards (the following are mainly flat washers and large outer diameter washers). The performance of gaskets is slightly different in hardness. They can be selected according to the actual working conditions. The specific performance is subject to the relevant product standards.
2. Spring washer
After the connection pair is tightened, the spring washer relies on the reaction force released by itself to enhance the axial tension between the connection pairs and thus increase the friction and play a role in preventing loosening. Common spring washers mainly include heavy-duty spring washer DIN 127A/GB 7244, standard spring washer DIN 127B/GB 93, saddle spring washer DIN 128A/GB 7245, corrugated spring washer DIN 137A/GB 860 and DIN 137B/GB 955, conical elastic washer DIN6796/ISO 10670 and other product standards.
3. Anti-loose gasket
Anti-loose gasket As the name suggests, the gasket that locks the connection pair. Here we mainly introduce the stop washer mainly based on mechanical fixed type and the washer that can increase friction to achieve the locking function.
Stop washer: Relying on mechanically fixed stop washer, it can prevent relative movement between the thread and the connected part and the threaded connection pair to prevent loosening. There are many forms of stop washer, mainly including single-ear stop washer, double-ear stop washer, inner tongue stop washer, outer tongue stop washer, etc. Among them, take the application of a single-ear stop washer as an example: after passing the bolt through the single-ear stop washer, fold the "long tongue" of the washer tightly against the edge of the connecting part, and then stand up the round ears of the washer, so as to achieve the purpose of stopping.
Locking washer: This type of anti-loose gasket usually achieves the purpose of locking by increasing friction and other methods. Common ones include SK tooth surface self-locking washer and double-sided locking washer.
4. Other gaskets
In addition to the common gasket types mentioned above, there are more gaskets for other purposes, such as seal gaskets, spherical gaskets, etc. Sealing gasket: Sealing gaskets can be used in places with fluid to prevent leakage. It is more common in sealed connections between pipes and sealed connections between parts of machinery and equipment. The main materials of sealing gaskets include metal sealing gaskets, non-metal sealing gaskets, etc. Common metal materials include copper, aluminum, etc. Non-metallic materials include rubber, asbestos fiber, etc. Spherical washer: Spherical washer is used in a matching manner. When installed, it can automatically adjust the position to make the stress even, increase the friction force, and play a certain anti-loosening effect. It can be seen that there are various types of washer, and each type of washer is given its own responsibilities and roles.
Types of gaskets
It is specifically divided into: flat washer-C, large washer-A and C, extra-large washer-C, small washer-A, flat washer-A, flat washer-Class-A, flat washer-Chash-A-Class, high-strength washer for steel structures, spherical washer, tapered washer, square oblique washer for I-shaped steel, square oblique washer for channel steel, standard spring washer, light spring washer, heavy spring washer, internal tooth lock washer, internal serrated lock washer, external tooth lock washer, external tooth lock washer, external serrated lock washer, single ear stop washer, double ear stop washer, external tongue stop washer, and round nut stop washer.
washer
Different types of washers have different functions and functions. Flat pads are only used to increase the contact area and have no anti-loosening function, while the elastic pads can be anti-loosening. The stop washer has a raised fixing foot on the inner ring and 3 to 4 raised locking feet on the outer ring. It also has a fixed function on the basis of anti-loosening, making it more suitable for use in places with severe vibrations. The locking washer has a force to push back after being locked, which can also be very good for loosening.
The principle of the gasket
Washers are divided into plane washer and spring washer. After the screw is tightened, because the contact area with the base is small, adding a plane washer can increase the pressure bearing area of the base, so tightening will not cause damage to the base or slippery wire. The spring washer increases the stress of the turnbuckle, making the turnbuckle tighter.
Installation of gaskets
The washer is used in conjunction with the round nut. When used, the washer is installed on the side where the nut is slotted. After tightening, the inner and outer stop ears are bent into the groove. After the round nut is tightened, the inner and outer ears are respectively pulled in the axial direction, and stuck to the keyway on the shaft and the opening of the round nut, so that the round nut will not loosen due to the rotation of the shaft.
Note: When installing the round nut with a stop washer, the inner teeth bent toward the round nut or the back toward the round nut?
When the round nut is tightened into place, the inner teeth of the stop washer bend towards the round nut. One of the outer teeth of the stop washer is bent into the groove on the outer wall of the circular nut, and the inner teeth are stuck in the groove on the threaded rod, so that the stop washer does not move relative to the screw when the circular nut is screwed in.
1. Flat washer
Flat pads are thin pieces for reducing friction, protecting the connecting surface or dispersing pressure. Flat washer is mostly made of flat metal rings, and its application is mainly aimed at reducing friction, isolating and dispersing pressure. What are the common flat gaskets? Fasteners mostly involve flat gaskets, such as ordinary flat gaskets DIN 125A /ISO 7089/ GB 97.1, chamfered flat gaskets DIN 125B /ISO 7090/ GB 97.2, C-class flat gaskets DIN126/ ISO 7091/GB 95, large outer diameter washers DIN9021/ISO 7093/GB 96.1.
There are differences in hardness performance of flat pads of different standards (the following are mainly flat washers and large outer diameter washers). The performance of gaskets is slightly different in hardness. They can be selected according to the actual working conditions. The specific performance is subject to the relevant product standards.
2. Spring washer
After the connection pair is tightened, the spring washer relies on the reaction force released by itself to enhance the axial tension between the connection pairs and thus increase the friction and play a role in preventing loosening. Common spring washers mainly include heavy-duty spring washer DIN 127A/GB 7244, standard spring washer DIN 127B/GB 93, saddle spring washer DIN 128A/GB 7245, corrugated spring washer DIN 137A/GB 860 and DIN 137B/GB 955, conical elastic washer DIN6796/ISO 10670 and other product standards.
3. Anti-loose gasket
Anti-loose gasket As the name suggests, the gasket that locks the connection pair. Here we mainly introduce the stop washer mainly based on mechanical fixed type and the washer that can increase friction to achieve the locking function.
Stop washer: Relying on mechanically fixed stop washer, it can prevent relative movement between the thread and the connected part and the threaded connection pair to prevent loosening. There are many forms of stop washer, mainly including single-ear stop washer, double-ear stop washer, inner tongue stop washer, outer tongue stop washer, etc. Among them, take the application of a single-ear stop washer as an example: after passing the bolt through the single-ear stop washer, fold the "long tongue" of the washer tightly against the edge of the connecting part, and then stand up the round ears of the washer, so as to achieve the purpose of stopping.
Locking washer: This type of anti-loose gasket usually achieves the purpose of locking by increasing friction and other methods. Common ones include SK tooth surface self-locking washer and double-sided locking washer.
4. Other gaskets
In addition to the common gasket types mentioned above, there are more gaskets for other purposes, such as seal gaskets, spherical gaskets, etc. Sealing gasket: Sealing gaskets can be used in places with fluid to prevent leakage. It is more common in sealed connections between pipes and sealed connections between parts of machinery and equipment. The main materials of sealing gaskets include metal sealing gaskets, non-metal sealing gaskets, etc. Common metal materials include copper, aluminum, etc. Non-metallic materials include rubber, asbestos fiber, etc. Spherical washer: Spherical washer is used in a matching manner. When installed, it can automatically adjust the position to make the stress even, increase the friction force, and play a certain anti-loosening effect. It can be seen that there are various types of washer, and each type of washer is given its own responsibilities and roles.
Types of gaskets
It is specifically divided into: flat washer-C, large washer-A and C, extra-large washer-C, small washer-A, flat washer-A, flat washer-Class-A, flat washer-Chash-A-Class, high-strength washer for steel structures, spherical washer, tapered washer, square oblique washer for I-shaped steel, square oblique washer for channel steel, standard spring washer, light spring washer, heavy spring washer, internal tooth lock washer, internal serrated lock washer, external tooth lock washer, external tooth lock washer, external serrated lock washer, single ear stop washer, double ear stop washer, external tongue stop washer, and round nut stop washer.
washer
Different types of washers have different functions and functions. Flat pads are only used to increase the contact area and have no anti-loosening function, while the elastic pads can be anti-loosening. The stop washer has a raised fixing foot on the inner ring and 3 to 4 raised locking feet on the outer ring. It also has a fixed function on the basis of anti-loosening, making it more suitable for use in places with severe vibrations. The locking washer has a force to push back after being locked, which can also be very good for loosening.
The principle of the gasket
Washers are divided into plane washer and spring washer. After the screw is tightened, because the contact area with the base is small, adding a plane washer can increase the pressure bearing area of the base, so tightening will not cause damage to the base or slippery wire. The spring washer increases the stress of the turnbuckle, making the turnbuckle tighter.
Installation of gaskets
The washer is used in conjunction with the round nut. When used, the washer is installed on the side where the nut is slotted. After tightening, the inner and outer stop ears are bent into the groove. After the round nut is tightened, the inner and outer ears are respectively pulled in the axial direction, and stuck to the keyway on the shaft and the opening of the round nut, so that the round nut will not loosen due to the rotation of the shaft.
Note: When installing the round nut with a stop washer, the inner teeth bent toward the round nut or the back toward the round nut?
When the round nut is tightened into place, the inner teeth of the stop washer bend towards the round nut. One of the outer teeth of the stop washer is bent into the groove on the outer wall of the circular nut, and the inner teeth are stuck in the groove on the threaded rod, so that the stop washer does not move relative to the screw when the circular nut is screwed in.