Have a good time everyone. In this article we will talk about such a tool as a pin driver. Many have encountered such a task as unscrewing a hairpin. Usually, many people do this with two nuts, but it also happens that the threads on the studs are broken, and in such cases there is also a way out, for example, you can weld the nut. But all this takes time, and with the help of such a tool it is done much easier and faster. So the hero of our article decided to make himself such an instrument. And to do this, he took a piece of round timber and first processed it into lathe before required sizes(Diameter 30 mm, length 40 mm.)

Then he will make holes in these places. And since the holes should not be in the center, the author will make substrates on one side for the workpiece.

After one hole was made, the author decided to make two more holes. One is 10 mm, the second is 8 mm.

I also made the substrates and started processing.

The result is a blank for the second part.

I connected it to the first part, and turning the second part in the first, I made a mark. According to which in the future he will make a groove for the first part in this way.

Everyone Thanks a lot! And see you again.

Production video:

In specialized auto repair shops, in production, in construction - wherever you often have to work with studs, a stud driver is used. For experienced craftsmen who know their business, there is no need to explain its purpose. And the name speaks for itself. However, many may not be clear about the design features of the instrument, its appearance how it works and approximately how much it costs.

Design features of the pin driver, principle of operation

The most famous design of this tool consists of a housing in which three rollers are located. Thanks to the complex inner surface When rotating the housing, the rollers firmly clamp the stud, ensuring its turning out even in difficult cases (fastening automobile manifolds, muffler elements and other places where the thread of the studs “sticks” to the hole of the part into which they are screwed). WITH reverse side the body usually has square hole for standard size ratchets (drivers), as well as hexagonal shape outer surface, to hold wrench.

In addition, there are designs whose fundamental structure is similar to the usual three-jaw (collet) chuck. When rotating, the chuck jaws also ensure reliable retention of the pin, which makes it possible to unscrew or tighten it with minimal effort. This tool is more versatile, since it is supposed to be able to work with studs of different diameters. Some designs based on the principle of clamping using a rotary eccentric also have a certain versatility (the scope of application is expanded due to the fact that the same tool can be used with different fastener diameters).

Many designs have been invented by those who like to make equipment and auxiliary mechanisms with their own hands - from several nuts compressed together on the free thread of a stud, to relatively complex devices where wedges or eccentrics are used to fix the stud.

If the use will be frequent, then it makes sense to purchase not just one pin driver, but a set for various diameters hairpins Rotation can be carried out either manually or using various power tools - screwdrivers, pneumatic impact wrenches or drills. After the pin is safely unscrewed, the pin driver, turning in the opposite direction, is removed from it. To be fair, it should be noted that after using this device, the thread of the stud must be restored using a die (the thread turns out to be somewhat dented), especially if the fastener is intended to be reused.

The advantage of using pin drivers

Enough a large number of People today face difficulties when dismantling threaded fasteners (studs or bolts). If we talk about car service, this is most often associated with the repair of old cars, where some connection elements have not been unscrewed for decades. Application benefits special device the following:

• with its help, in the vast majority of cases, it is possible to unscrew a bolt with a broken head without damaging the threads in the part;
• the pin itself remains practically undamaged; after running with a die, it is suitable for reuse;
• minimum time spent on work;
• Made from high-quality steel, the tool is durable and durable;
• V hard to reach places It is often more convenient to use a pin driver rather than improvised means.

Simply put, the tool makes work easier and faster. It's no secret that a broken, rusty bolt in the absence of special equipment can paralyze all car repair work. A poorly turned pin can cause the repair time to triple. Therefore, if the pin suddenly does not want to turn out of a place where its breakage could cause serious problems, it is better to use tools specially designed for this.

Price for stud drivers

For household use A universal pin driver can be quite convenient, which allows you to work with different diameters threaded parts. For car services or service stations, the most functional may be special set, including up to a dozen heads of the most common diameters. Moreover, finding and buying a hairpin driver today is not particularly difficult - these devices are sold both in regular stores and on various online sites. The prices are quite affordable - for a universal eccentric mechanism it ranges from 400 to 1000 rubles. Hairpin heads with three rollers are sold from 300 to 600 rubles apiece, if we consider the most common sizes. Sets can be purchased from 1.5 to 8 thousand rubles, depending on the configuration, quality and manufacturer. In the case of professional use, it is better not to skimp on the manufacturer, especially since the difference in price is not too great.

In the practice of repairing automobile and tractor equipment, there is a need to screw in and unscrew studs - fasteners without turnkey surfaces. For these purposes, a special tool is used - a hairpin driver or a key for hairpins. Read about stud guns, their types, operation and choice in this article.

What is a stud gun?

Hairpin wrench (key for hairpins) - specialized tool for screwing in and out of threaded rods.

Hairpin - fastener in the form of a rod with threads at both ends. The stud is screwed into the product in one part, and a nut is screwed onto the second part. The design of the stud does not provide special surfaces for the barb (such as the heads of bolts or the faces of nuts) or other tools, which significantly complicates the procedure for screwing it in and out. As a result, you have to use special tools, which are called stud wrenches or simply stud wrenches.

To properly purchase a stud gun, you need to understand existing types this tool, their features and advantages.

Types, design and principle of operation of the stud gun

The main problem of working with studs is to ensure reliable fixation of the cylindrical rod without damaging it and with the force necessary for screwing in or out. Several solutions to this problem have been proposed, and according to the method of clamping the studs, stud drivers are divided into several types:

• Roller;
• Eccentric;
• Collet (cam);
• With nut clamp and stop.

In this case, all types of tools can have one of two types:

• An independent tool that works without additional devices;
• Equipment for working with regular keys, cranks, ratchets and other devices.

The first type of tool is convenient and easy to use, it is always ready for work, however, as a rule, it has more complex design and high cost. The second type of tool can have hexagons or squares standard size(usually 1/4, 1/2 and 3/4 inches) for wrench, ratchet, etc. This tool is more versatile, compact and affordable.

Each of these tools has its own design features and operating principle.

One of the most simple in design and reliable tools. In general, it is a cylindrical body, inside of which there are three cylindrical rollers, between which spacer inserts can be additionally installed. The inner surface of the housing has a complex profile (triangular with rounded edges and corners, with ovoid elements, etc.), so the rollers, rolling inside the housing, can move closer and further from its central axis.

The roller pin driver works simply. The tool is put on a pin and turned using a wrench or wrench. When turning, the rollers roll over the pin and the inner surface of the body, which leads to jamming of the pin - now the force from the hand is transferred to it, which allows you to screw it in or out.

Keys for studs of this type are simple, reliable and convenient, but they have a significant drawback - each stud driver is made for a specific diameter of the stud. Only in this case is the necessary pressure of the rollers against the pin and its jamming when turning ensured. Therefore, to work with various studs, it is necessary to have a whole set of roller stud drivers.

Tool of this type is also very simple, while it is more versatile than a roller. Structurally, this eccentric pin driver is very simple: its basis is a body with one or two holes for pins, on which there is a hinged eccentric - a metal disk with a grooved edge and the possibility of supply to the holes. Also on the body there is a knob or square for installing a knob, ratchet or other device.

An eccentric pin driver works simply: the tool is put on a pin, the disk is brought to the pin, and the entire tool is turned - when turning, the eccentric rests on the pin, jams it and allows the force necessary for screwing in/out to be transferred to it.

Today, two types of eccentric stud drivers are produced:

• Universal - with one or two holes, allowing the tool to be used to work with studs of different diameters;
• True to size - with one hole for working with studs of the same diameter.

It should be noted that there are tools that combine the design features of eccentric and roller pin drivers. This tool has three small eccentrics covering the pin; when the tool is rotated, the eccentrics jam the pin at three points, providing maximum pressure and transmission of high force.

This universal tool, having a device similar to the collet chuck of a drill and other tools. The basis of this type of pin driver is a body, inside of which there are movable cams. When the body is rotated, the cams converge towards the center, clamping the pin and ensuring that force is transferred to it by hand.

Collet pin drivers are the most versatile, as they allow you to work with pins of various diameters, even non-standard ones. However, the cams do not always provide the necessary degree of fixation of the tool on the stud, so this type of stud driver often cannot cope with the fastener. This is an inexpensive amateur tool that is practically not used in auto repair shops.

Hairpin driver with nut clamp and stop

This tool is quite simple in design, so it is often made at home. The basis of the stud driver is a body with handles, in the lower part of which there is a nut, and in the upper part there is a thread for screwing in a wrench. In the body opposite the nut, a threaded hole is drilled for a bolt or screw, which secures the nut from turning.

This tool works simply. A nut is installed and fixed in the housing with a bolt. required size, the tool is screwed onto the stud with a nut, then a knob is screwed into the body, it rests against the end of the stud and gets jammed. Now the body is rotated counterclockwise, and the pin, secured with a nut and a knob, is turned out.

This tool is used correctly only for turning out studs. Despite the simplicity of its design, it requires a large number of operations to work with one pin, so it is not always convenient. Today, stud wrenches of this or a similar design are rarely used; they have been replaced by simpler and more convenient roller and eccentric stud drivers.

How to choose a stud driver

When choosing a stud gun, it is necessary to take into account the nature of the work that will be performed by this tool and its frequency.

For use in a garage where the studs only need to be removed from time to time, the best solution will become a universal eccentric-type pin driver. This tool will allow you to work with hairpins various sizes(with its help you can unscrew and screw in the studs of almost all engines - from two-stroke scooters to medium-duty trucks, you can also repair other units with studs), it is reliable and easy to operate, and has affordable price. You can also purchase a collet pin driver, but it does not always provide the required degree of fixation and cannot work with large diameter pins.

For professional use in auto repair shops best choice There will be sets of roller or eccentric type stud guns. Having a tool for a certain size of studs significantly increases the quality and speed of work, and the costs for it pay off in a short time. Although in this case it would not be amiss to have a universal eccentric tool - with its help you can quickly perform simple work.

At correct selection with a stud driver, you will provide yourself with a reliable tool that will help solve the most complex tasks for vehicle maintenance and repair.