Choosing a quick-clamping nut for a grinder

Someone more often, someone less often uses an angle grinder (popularly a Bulgarian) during repair or construction work. And at the same time they use an ordinary nut for an angle grinder together with a key, risking injury when unscrewing it or simply ruining the circle. To prevent this from happening, we developed a quick-release (quick-release, self-locking, self-tightening) nut. Now there is no need to change the circle in the key. You just need to unscrew the nut by hand.

The angle grinder is a convenient, transportable and reliable tool designed for cutting and grinding stone, ceramic, metal and sometimes wood surfaces. Working with an angle grinder only looks relatively straightforward and straightforward from the outside; in practice, it requires certain abilities and knowledge. Using a grinder, a specialist must be as careful and focused as possible. If you do not adhere to the established safety rules and work technologies, then various injuries are provided to you. Failure to follow the required precautions can result in a worker being crippled for life.

Of course, developing any of the modifications of the grinders, the manufacturing companies strive to insure the user as much as possible when operating the tool, but one should also use the mechanism carefully and have an idea of ​​its certain properties. A very significant aspect when choosing an angle grinder is the type of clamping fastener supplied to it.

A specialized clamping nut is produced with each angle grinder. By means of it, a grinding or cutting wheel is fixed. The design characteristics of the nut are quite interesting. As the clamping fastener is pushed onto the shaft, one part of the fastener is pressed against the disc, and the other part rotates, forcing the bottom of the nut to grip the disc more and more. Actually, this nut is able to create an abundance of difficulties for the owner of an angle grinder.

The fact is that cutting and grinding discs, although they have different thicknesses from 0.8 millimeters to 3 millimeters, are fragile and thin under any conditions. Even slight body swaying contributes to the skewing of the cut-off wheel in the slot. As a result, it starts to wedge and may crack. A change is needed.

It turns out that in the course of long-term work with the tools, the clamping nut tightens spontaneously, after such tightening with your fingers, it can no longer be unscrewed. You will definitely need a special key with two horns, which is included in the set.If your unit has an ordinary clamping fastener, then you need to find a key, which, when needed, disappears somewhere (it is advisable to tie it with insulating tape to the cord), and then, after suffering, unscrew the fastener. There is also the worst option - to grind off the nut on emery. However, there is a way out of this situation, and not even one.

Certain manufacturers have taken the issue of the angle grinder's tightened fastener seriously and eliminated it. For example, the DeWALT sander has an improved mechanism and clamping fastener that can be unscrewed freely and quickly even after prolonged use of the attachment. Both the manufacturers of angle grinders and the creators of clamping nuts are also in constant search. The famous German company AEG has improved the clamping fastener.

As a result, using a fastener from this company, you can forget about discomfort, the fastener turns away quickly and without much effort, at any moment. And now you do not need to think about how to free the jammed circle or what is left of it. It's pretty simple: a special thrust bearing is mounted in the AEG quick-clamping nut, which will prevent the fastener from tightening spontaneously and jamming the circle.

In addition to AEG, there are a number of trade brands that manufacture and practice specialized quick-release fasteners. Such fasteners are classified into 2 types:

• which, under any conditions, must be turned off with a key, but now it is not so long and difficult;
• improved, which, even if the circle is jammed, will make it possible to unscrew them with your fingers.

In such a nut, the lower segment with the upper one are not dependent on each other, they rotate by themselves. It is used in angle grinders instead of a standard nut. The advantages of such a fastener are as follows:

• to unscrew it, it does not need a specialized wrench (a regular open-end or a simple cap will do);
• the circle is not pressed tightly, therefore, the clamping fastener can be unscrewed freely.

There is probably only one drawback - its cost is slightly higher than the typical one.

It is practiced in various instrument modifications. It is included in the package of cheap angle grinders. Fastener advantages:

• firmly presses the circle;
• low cost.

Disadvantages:

• a dedicated wrench is required for unscrewing;
• often spontaneously sticks to the circle, and special skill or equipment is needed to turn it off.

Specialized moving inner nut made by Makita. Advantages:

• makes it possible to freely remove the circle, no matter how tightly it is tightened in the process of work;
• increases user efficiency.

Minus - the cost is significantly higher than that of other fasteners for angle grinders.

Replaces the conventional clamp fastener. Advantages:

• no special wrench required for unscrewing;
• freely dismantled;
• high wear resistance;
• durable.

Disadvantages:

• quite expensive;
• can sometimes stick to the circle and in this case it should be turned off as usual.

The structure contains bearings inside the nut. In the process of operation, the bearings are dispersed inside to balance the vibration processes. Advantages:

• the grinding disc works 50% longer;
• there is no vibration;
• multiplies the tool life.

The disadvantage is the high cost.

Bosch is familiar to almost everyone, it produces a really good-quality tool and has repeatedly confirmed its own reliability in the course of improving the power tool. For example, their innovation is the SDS-clic quick-locking nut. She shocked everyone with her own perspective. The creators, in an effort to help reduce the time for changing grinding wheels, did not create new wheels at all, but made it possible to shorten the change time. Everything is done in one moment with your hands, without a key, both tightening the circle and unscrewing it.

Multifunctional quick-clamping fasteners for the angle grinder, which guarantee a reliable clamping of the wheel and no danger when using tools. They are used on the spindle, the most running thread M14. The use of equipment with a diameter of up to 150 millimeters is recommended, and ultimately users effectively use FixTec even on angle grinders with a circle diameter of 230 millimeters.

The pros are as follows.

1. Rapid change of equipment, less than 12 sec.
2. Circle jam protection.
3. Tightening and removal without a special key.
4. Turnkey holes for unexpected moments.
5. Multifunctionality of use on grinders of the overwhelming mass of manufacturers. It is used on the most popular types of circles with a diameter of up to 150 millimeters, a thickness of 0.6 - 6.0 millimeters.

Multifunctional quick-clamping nut for angle grinders. Through it, the employee is able to fix the circle smartly and without the use of auxiliary devices. This nut is compatible with discs of any size - from 115 to 230 millimeters. Typical thread (M14) makes it possible to install a self-tightening fastener on an angle grinder from different companies.

For a BOSCH quick-clamping nut for a grinder, see the following video.