Screwdrivers are basic tools for assembling/disassembling various technical mechanisms and devices. They are used to turn screws with special grooves various types on the heads (twisting and unscrewing) . The screwdriver increases and transmits the rotational movements of the hand to a small, specially sharpened working part (slot), which is inserted into the head of the screw. Typically, a screwdriver consists of two parts: a handle on one side and a slot on the other. Instead of a handle, a similar function can be performed by a rotating mechanism with electric drive to make the task easier for the person working with the tool. Electric screwdrivers have become one of the popular types of power tools.
The most important thing when using screwdrivers is to choose the correct type and size of tip to match the screw head. Never use screwdrivers that are not designed to handle the specific type of screw.
There are a great many different types of screws, and in addition to using traditional type slots, new types and screwdrivers for them are periodically invented. Most common types of screwdrivers, such as flathead and Phillips, have an extremely wide range of applications. At the same time, less typical types are often used in certain areas. Some screwdrivers are designed for service mobile devices(phones, smartphones, MP3 players, etc.). Often manufacturers electronic devices Currently, special star-shaped screws are used, patented under the names Torx and Pentalobe.
We'll take a closer look at the most commonly used types of screws and the appropriate screwdrivers for them.
Spline types
Flat
The original and most commonly used type of screw is one that has a single slot in the head. However, this type of fastening is losing popularity because it is the least reliable - the screwdriver often slips out of the slot and the chances of damaging the screw or screwdriver are very high.
Standard marking: SL.
Cross Phillips
Another extremely popular type of spline is the Phillips spline. Phillips slot sizes (different from screw sizes) are designated 0000, 000, 00, 0, 1, 2, 3, and 4 (in ascending order of size).
Standard marking: PH.
Cross-shaped Pozidriv ®
The pattern is similar to a Phillips cross, but has 4 additional guides. Type of screws popular in Europe. Pozidriv sizes are similar to Phillips sizes.
Standard marking: PZ.
Star Torx
A six-point screw with a head hole in the form of a six-pointed star with rounded ends. A popular type of mount in electronics, automotive systems and other applications. Torx screw sizes are designated T1, T2 (or T01, T02) ... T55.
Standard marking: T.
Star-shaped Torx with anti-vandal protection
Anti-vandal Torx screw with additional protection Anti-tamper designed for applications where user intervention is not desired. Screwdrivers and wrenches for Tamper-proof Torx screws can also be used to work with regular Torx screws.
Standard marking: TxH, where x is the size.
Hex Hex
A screw with a hexagon-shaped hole that can be removed with a hex wrench or screwdriver.
Standard marking: H.
Also known as a triangular slot, it is a screw with three flat “wings” and a small triangular hole in the center. There is no specific use for Tri-wing bindings. They were once used in Nintendo products. Today, they are commonly used in electronic equipment. Tri-wing sizes are designated TRI000, TRI00, TRI0, TRI1, TRI2, TRI3, etc.
Standard marking: TRI.
Two-pin (spanner)
Screw with two round holes opposite each other is designed to avoid unauthorized access. Mainly used in electronics, in in public places: restrooms, elevators, train cars, etc.
Standard marking: SP.
External types
There are also several external types screws for box screwdrivers - female screwdriver and male screw: square, pentagon, hexagon.
The most popular type of union connections is the hexagon. You can work with it using an adjustable wrench.
Below is a table with the most commonly used screwdrivers. All screwdrivers in this series are made of Ni-Cr-Mo alloy with an oxide tip.
| Model | Type | Size | Working length | Image |
|---|---|---|---|---|
| Pro"sKit 9SD-201A | 3.0 | 75 mm |  |
|
| Pro"sKit 9SD-202A | 5.0 | 75 mm | ||
| Pro"sKit 9SD-205A | 3.0 | 100 mm | ||
| Pro"sKit 9SD-207A | 6.0 | 100 mm | ||
| Pro"sKit 9SD-210A | 5.0 | 100 mm | ||
| Pro"sKit 9SD-213A | 6.0 | 150 mm | ||
| Pro"sKit 9SD-214A | 6.0 | 200 mm | ||
| Pro"sKit 9SD-220A | 6.0 | 40 mm | ||
| Pro"sKit 9SD-222A | 8.0 | 150 mm | ||
| Pro"sKit 9SD-201B | #0 | 75 mm |  |
|
| Pro"sKit 9SD-202B | #1 | 75 mm | ||
| Pro"sKit 9SD-205B | #0 | 100 mm | ||
| Pro"sKit 9SD-207B | #2 | 100 mm | ||
| Pro"sKit 9SD-210B | #1 | 100 mm | ||
| Pro"sKit 9SD-213B | #2 | 150 mm | ||
| Pro"sKit 9SD-214B | #2 | 200 mm | ||
| Pro"sKit 9SD-216B | #1 | 150 mm | ||
| Pro"sKit 9SD-217B | #2 | 250 mm | ||
| Pro"sKit 9SD-220B | #2 | 40 mm | ||
| Pro"sKit 9SD-222B | #3 | 150 mm | ||
| Pro"sKit 9SD-200-T05H | T05H | 50 mm |  |
|
| Pro"sKit 9SD-200-T06H | T06H | 50 mm | ||
| Pro"sKit 9SD-200-T07H | T07H | 50 mm | ||
| Pro"sKit 9SD-200-T08H | T08H | 50 mm | ||
| Pro"sKit 9SD-200-T09H | T09H | 50 mm | ||
| Pro"sKit 9SD-200-T10H | T10H | 75 mm | ||
| Pro"sKit 9SD-200-T15H | T15H | 75 mm |
Precision screwdrivers
What is a precision screwdriver?Screwdrivers with highly precise tips, specially sharpened to precisely fit small and extra-small screw heads, are called precision screwdrivers. This type of screwdriver is used for assembling/disassembling components when repairing small devices and gadgets such as watches, Cell phones, cameras, laptops and tablets, players, video games and other electronics.
Traditionally, precision screwdrivers and sets of such screwdrivers are used by craftsmen, good set screwdrivers are also a must-have accessory for every workshop.
The range of precision screwdrivers always includes the most commonly used types and sizes: slotted, Phillips, torx, hex. For some precision work, we need screwdrivers for special screws: TriWing, Pozidriv, spanner, etc. Apple uses a special anti-vandal screw for its products, which can be unscrewed/tightened with a Pentalobe five-pointed star screwdriver.
Torx
Torx screws are quite popular for precision applications such as computer repair, mobile device repair, electronics repair, etc. Sizes: T1, T2 (or T01, T02) ... T55.
Standard marking: T.
“Five-point anti-vandal screws” is the name of the system used by Apple for its developments. Pentalobe screw sizes include TS1 (0.8mm, used in iPhone 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6S Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X), TS4 (1.2 mm, used in MacBook Air and MacBook Pro with Retina display), and TS5 (1.5 mm, used in the 2009 MacBook Pro battery).
Standard marking: TS.
Tri-Point screws are used in the manufacture of mobile devices, electronics, etc. They have begun to be used Apple company in smartphones that were released after the iPhone 6, as well as in the Apple Watch.
Standard marking: TP/Y.
Users often prefer to use screwdrivers from Pro"sKit, which has developed a whole series of precision screwdrivers. You can choose the perfect kit for your needs. The Pro"sKit SD-081 series contains the most commonly used screwdriver types, as well as some specific types for various specialized applications . You can view the products in this series at comparative table below.
| Model | Type | Size | Working length | Image |
|---|---|---|---|---|
| Pro"sKit SD-081-S1 | 1.0 | 50 mm |  |
|
| Pro"sKit SD-081-S2 | 1.6 | 50 mm | ||
| Pro"sKit SD-081-S3 | 2.0 | 50 mm | ||
| Pro"sKit SD-081-S4 | 2.4 | 50 mm | ||
| Pro"sKit SD-081-S5 | 3.0 | 50 mm | ||
| Pro"sKit SD-081-S6 | 2.4 | 75 mm | ||
| Pro"sKit SD-081-S7 | 3.0 | 100 mm | ||
| Pro"sKit SD-081-S8 | 4.0 | 150 mm | ||
| Pro"sKit SD-081-P1 | #000 | 50 mm | ||
| Pro"sKit SD-081-P2 | #00 | 50 mm | ||
| Pro"sKit SD-081-P3 | #0 | 50 mm | ||
| Pro"sKit SD-081-P4 | #1 | 50 mm | ||
| Pro"sKit SD-081-P5 | #0 | 75 mm | ||
| Pro"sKit SD-081-P6 | #1 | 100 mm | ||
| Pro"sKit SD-081-P7 | #1 | 150 mm | ||
| Pro"sKit SD-081-T1 | T01 | 50 mm | ||
| Pro"sKit SD-081-T2 | T02 | 50 mm | ||
| Pro"sKit SD-081-T3 | T03 | 50 mm | ||
| Pro"sKit SD-081-T4 | T04 | 50 mm | ||
| Pro"sKit SD-081-T5 | T05 | 50 mm | ||
| Pro"sKit SD-081-T6 | T06 | 50 mm | ||
| Pro"sKit SD-081-T7 | T07 | 50 mm | ||
| Pro"sKit SD-081-T8 | T08 | 50 mm | ||
| Pro"sKit SD-081-T9 | T09 | 50 mm | ||
| Pro"sKit SD-081-T10 | T10 | 50 mm | ||
| Pro"sKit SD-081-T15 | T15 | 50 mm | ||
| Pro"sKit SD-081-T20 | T20 | 50 mm | ||
| Pro"sKit SD-081-T5H | T05H | 50 mm | ||
| Pro"sKit SD-081-T6H | T06H | 50 mm | ||
| Pro"sKit SD-081-T7H | T07H | 50 mm | ||
| Pro"sKit SD-081-T8H | T08H | 50 mm | ||
| Pro"sKit SD-081-T9H | T09H | 50 mm | ||
| Pro"sKit SD-081-T10H | T10H | 50 mm | ||
| Pro"sKit SD-081-T15H | T15H | 50 mm | ||
| Pro"sKit SD-081-T20H | T20H | 50 mm | ||
| Pro"sKit SD-081-H1 | H0.7 | 50 mm | ||
| Pro"sKit SD-081-H2 | H0.9 | 50 mm | ||
| Pro"sKit SD-081-H3 | H1.3 | 50 mm | ||
| Pro"sKit SD-081-H4 | H1.5 | 50 mm | ||
| Pro"sKit SD-081-H5 | H2.0 | 50 mm | ||
| Pro"sKit SD-081-H6 | H2.5 | 50 mm | ||
| Pro"sKit SD-081-H7 | H3.0 | 50 mm | ||
| Pro"sKit SD-081-M3 | M3.0 | 72 mm | ||
| Pro"sKit SD-081-M3.5 | M3.5 | 72 mm | ||
| Pro"sKit SD-081-M4 | M4.0 | 72 mm | ||
| Pro"sKit SD-081-M4.5 | M4.5 | 72 mm | ||
| Pro"sKit SD-081-M5 | M5.0 | 72 mm | ||
Pulled from Wikipedia, let it hang here, it won’t hurt anyone, I’m actually writing because I need to somehow collect all the information on the slots in one place and put it on shelves. Additions, arguments, etc. are welcome.
Everything is clear here.
SL indicating the width and (not always) thickness of the slot in millimeters.
Phillips slot (PHILLIPS and POZIDRIV)
Two types: Philips and Pozidrive
Phillips: early version.
Screwdrivers are marked with letters PH with slot number - 000 (1.5 mm), 00 (2 mm), 0, 1, 2, 3, 4.
Varieties:
PHILLIPS II
ACR RIBBED PHILLIPS
PHILLIPS SQUARE-DRIV
Pozidrive: a modern version.
Screwdrivers are marked with letters PZ with slot number - 0, 1, 2, 3, 4.
Varieties:
POZISQUARE DRIV
If you use screwdrivers in the wrong slot, you can tear off the slot itself.
The head of the fastener is usually cylindrical in shape with a hexagonal recess. To work with splines of this type, it is used hex key(inbus key)
There is also Hex Tamper Resistant as a variation:
INBUS is an acronym In nensechskantschraube B auer u nd S chaurte - Bauer & Schaurt hexagon socket head screw
Keys and screwdrivers are marked SW with the slot size in millimeters or fractions of an inch (distance between parallel edges):
Standard metric sizes are defined in ISO 2936:2001
0.7; 0.9; 1.0; 1.25; 1.3 and 1.5
from 2 to 6 in 0.5 mm increments
from 7 to 22 in 1 mm increments
24, 25, 27, 30, 32, 36, 42 and 46 mm.
Torx (star)
Torx (Torx) - type of threaded slot fasteners in the shape of a six-pointed star.
Varieties:
Torx Plus, the same eggs, in profile and squarer.
Torx Tamper Resistant (anti-vandal) with pin, TR marking
Brigadier Pentahedron key set - five-beam (I couldn’t find any pictures)
TORXSTEM same shit with pictures
AudiTORX (Schkoda Zvezdochka)
Well, all sorts of exotic things:
Square (Robertson slot)
A square slot is a type of slot in threaded fasteners in the shape of a regular square. Well, actually, I won’t write about the fact that it is used for all sorts of technological holes in the automotive industry
Warm and lampy, damn the Soviet GOST
There is a possibility that you will come across a variety of Square Tamper Resistant with a pin.
Torq-Set and Tri-WingOne-way (slotted)
Anti-vandal, screw only.
Spanner
Double prong fork. Found in elevators
Used in Chevy and GMC
Two types:
A
Spline M-profile(twelve-rayed star)
As they say specifically for Shkodochka (Volkswagen)
Tri-groove
Actually, there are more of them, but I wrote about those that I actually met in real life.
UPD. I haven’t written anything yet, but there’s a chance I’ll come across:
Pentalobe
Oddly enough, everyone saw the lyubas.
Nothing more than a slot on the pieces of Ogryzk.
Star octahedron
UPD. To help takc
FOUND!
In short, what is common from above is standardized in one way or another: there is GOST, and DIN, and in general. But then the Scandinavians begin to become crazy, since the oval head is used in Nescafe (Nespresso) and Ikea.
It's called: oval-head screws
Sold on Amazon (for coffee makers)
From available means it is fixed as follows:
adjusting it to the desired form
Proof (careful French language)
Here's another version:
By turning a bat from an aluminum rod.
A plastic tube.
sic, it’s clear what’s going on here:
Well, just by gluing the tube to the bolt:
Who, maybe add more tags? Like: cognitive and fastening?
Srach, improvements, shit-throwing and other joys of life are welcome. Additions to the text and corrections by the author are MANDATORY!
The simplest option is a slot. In the absence of a tool, a screw with such a head, if it is not rusted, of course, can be unscrewed with a strip of metal, a knife blade, a coin, etc. The slots are marked according to the thickness and width of the tip. For example, 4x0.5: 4 mm is the width, and 0.5 mm is the thickness of the tip. Today the slot is not as popular as it used to be. There are many good reasons for this: there is no clear fixation of the head on the bolt head, the tool comes off, there is a risk of scratching the paint on the car body or getting injured. And with rusted screws, things are even worse: the head (screwdriver blade) comes out of engagement, damaging the splined part of the screw.
An additional slot on the screw head - and we have before us, perhaps, the no less popular cross (Phillips). It’s easier to understand the dimensions here, since each profile has its own conventional number from PH000 to PH4 (PH is short for Phillips). The main advantage of cross-shaped bits over spline bits is the increased contact area of the working surfaces, self-centering of the tool and the ability to work at a slight angle. Accordingly, you can tighten the screw with a greater torque than in the previous case without fear of damaging it.
Additional slots, but significantly smaller than the main grooves on the cross profile, distinguish the new screw head, called Pozidriv. Abbreviation PZ, in use conditional numbers from PZ0 to PZ4. Pozidriv, although it allows you to transmit a little more force, like Phillips, does not hold very tenaciously on the screw head, therefore, to assemble critical components and mechanisms, bolts with internal or external hexagon are used.
The range of external hexagons is very wide: from 1.5 to 80 mm. Small bolts are used to secure parts and boards in control units, and large bolts are used for the chassis.
When purchasing a tool set, a 12-point profile is preferable, since the car uses not only hexagon bolts, but also 12-point ones - for example, flywheel and cylinder head bolts on Mercedes engines.
XZN heads are designed for bolts with an internal 12-point head. They secure the starter, seat slides, cylinder heads, and auxiliary unit pulleys. The marking of these heads is not the usual metric, but conventional, with the letter M in front of the profile number. Range - from M4 to M18. There are also variants of this profile with a pin in the center (for example, the oil drain plug from transmission units on Volkswagen Group cars). Some craftsmen successfully “remove the protection” by breaking out the pin.
The choice of internal hexagons is not so wide: from 1.3 to 27 mm. These bolts have a more compact head than external hex bolts. In this case, the tool head is smaller than the outer diameter of the bolt head, and problems with loosening hard to reach places ah occur much less frequently.
But the internal hexagons turned out to be not so reliable: the head often turned. The reason is not only the low quality, but also the profile features. Therefore, the capricious fasteners were replaced by the more durable and hardy Torx. Sizes - from T6 to T100; from the 6th to the 10th number they follow through one, then through five, and from the 60th to the hundredth through ten, although there are exceptions, for example T27. It is possible that intermediate sizes will be added.
With equal dimensions, the Torx profile can withstand greater loads compared to a hexagon, and the ability to turn is minimized. Such fasteners are widespread not only on foreign cars, but are already used on VAZ cars - for example, they hold the “jabot” and mating parts door locks at Kalina.
To protect components and assemblies from disassembly by unqualified (read: those without special tools) personnel, some manufacturers use a Torx with a pin in the center. It is designated Torx TR. Such a tool is used when replacing, for example, the Bosch mass air flow sensor measuring element on many cars.
In addition to the internal Torx profile, there is a similar external one. Its marking begins with the letter E, sizes from E4 to E24. There are also non-standard options, for example E11. This standard can be found in the mounting of the power unit support on the Kalina.
Not long ago, auto component manufacturers offered a profile similar to a Torx, but with five “edges” and a pin in the center. The first two letters in the marking are RT. Sizes so far range from RT10 to RT50. The range will most likely expand in the near future. The profile is also used in precision equipment, for example, massive air flow sensors - instead of the “Torx” with a pin, which has already been “mastered” by craftsmen.
We all use self-tapping screws when working with wood. And, of course, everyone has more than one type of them stored in a treasured box on their shelf. How could it be otherwise, because there are a great many of them on sale. Construction stores offer a wide range of self-tapping screws various forms, sizes and purposes. For an experienced master It’s not difficult to navigate even in such a variety: he selects the appropriate diameter and length to the weight and size of the parts being fastened. I buy a black self-tapping screw with a horn-shaped head for working on drywall, and a universal self-tapping screw for dowel fastening. Galvanized self-tapping screw will be used when internal works, and for external use, for example, for assembling a terrace - stainless steel, which will not leave brown traces of corrosion on the board. Everything here is clear and simple. However, there is one more parameter: the type of screw slot. And here questions may arise: why are there so many of them, how are they different, and which slot is better?
Let's take a look at the most popular splines.
A slot is a slot, a recess in the end surface of the screw head, designed to transmit pressure and torque from a screwdriver or power tool attachment to the body of the screw when screwing. Some craftsmen are accustomed to using the term “drive”.
Straight slot - Slotted (abbreviated as SL)
The first, back in the Middle Ages, to appear was the straight slot - Slotted. It is extremely inconvenient and a relic of the past. Judge for yourself: when tightening, it is very difficult to hold the bit or screwdriver on the straight slot coaxially with the body of the screw. As a result, the tool loses adhesion to the hardware and slips, while the equipment wears out, chips on the surface of the attached parts are common, and the master can be injured. An attempt to impart increased torque results in the straight spline breaking off.
Spline SL
Phillips slot (abbreviated PH)
The invention of the Phillips cross-head slot in the 1930s was a real breakthrough. It has become possible to position the tip of the tool strictly in the center of the slot, coaxially with the body of the hardware, so the tool now holds better and slips less often. The screwing speed has increased, and it has become possible to perform installation and disassembly without breaking the slot. The Phillips slot protects the thread from breaking due to the structure of the slots, which taper towards the bottom: when screwing is completed, when the maximum value of the twisting force is reached, the tool tip is pushed out of the slot. However, it is precisely this pushing effect that imparts additional load to the inclined walls inside the slot, contributing to their premature wear, and in order to increase the torque, it is necessary to expend significant forces pressing the tool against the screw.
PH slot
Phillips slot - Pozidriv (abbreviated as PZ)
In the 60s, a modified version of the cross-shaped slot appeared - Pozidriv (abbreviated PZ). It has 4 additional rays diverging from the center. Unlike the trapezoidal slots on the Phillips slot, the Pozidriv slots have rectangular slots, which reduces the ejection force of the bit and makes it possible to increase torque. But, again, you must remember to reduce the twisting speed at the end of installation so as not to tear off the slot.
Spline PZ
Torx slot (abbreviated as TX)
This problem is solved by modern Torx slot. It has the shape of a six-pointed star, which is why craftsmen are accustomed to calling it the Asterisk. IN Everyday life you can come across such concepts as an asterisk wrench, an asterisk screwdriver (or a torx wrench, a torx screwdriver). These are keys and screwdrivers with Torx slots. When using a Torx sprocket, there is no need to limit the torque at the end of screwing. When working in limited space and hard-to-reach places, through the use of a special Torx bit (screwdriver attachment) Torx-Ball - an asterisk with a ball-shaped tip, installation at an angle to the axis of the screw is possible. Unlike cross-shaped splines (PH and PZ), the torx sprocket is not clogged with paint and varnish after decorative and protective treatment of the wood surface. Torx allows you to unscrew the screw without any problems if necessary. The torx bit makes maximum contact with the surface of the head, slipping is eliminated. The Torx slot has the highest degree of torque transmission from the tool to the installed self-tapping screw. It is not surprising that it is the Torx slot that is located on the heads of structural screws (up to 600 mm long), which ensure reliable fixation of the most critical connections.
Torx size or Torx number varies depending on the diameter of the screws and screws.
Torx slot
Correspondence table between screw/screw size and Torx number
So, we have found out that the TORX slot is the most productive and trouble-free - and these are precisely the qualities that are valuable for any professional.
And one more fact: on the shelves of construction hypermarkets in our northern neighbor - Finland - the most popular fasteners are self-tapping screws and TORX screws . For example, popular self-tapping screws with a flange for thin metal sheets with a torx drive you can buy there for a long time. Torx keys, a Torx screwdriver, a set of Torx bits for any need - all this is also on sale.
We hope that, sooner or later, this trend will reach us.
Save your energy and time! Buy TORX- perfect solution. Choose the best from TsKI.
A slot is a slot on the head of a screw or screw (German: Schlitz - groove, slot), designed to transmit torque to this product from a tool (screwdriver or socket wrench).
Splines come in various shapes and sizes. In this article we will look at the most common types of holes and the bits intended for them.
Straight spline (SL) - the most popular and simplest form slot. It is a straight groove passing through the center of the head of the fastener. The head for fasteners with a straight slot is called a "spline" or colloquial speech: “flat”, “straight” or “minus”. The working end of the screwdriver is a wedge-shaped plate.
The disadvantage of this slot is that due to the lack of clear centering, the screwdriver often flies out of the groove, while the edges of the slot itself “break off,” which is especially typical for high protracted forces. For this reason, the flat spline is poorly suited for assembling mechanisms and precision products.
Phillips slot (PH) - a widespread type of hole in a fastener. The main varieties are the traditional Phillips and the more modern Pozidrive.
Phillips (not to be confused with the Philips brand of equipment) is the oldest and known species Phillips-head threaded fasteners and screwdrivers or bits for them.
This slot was patented and put into production by a certain Henry Phillips (H.F. Phillips), who, in turn, acquired the rights to the idea from the inventor J.P. Thompson.
In a cross-shaped slot, compared to a straight slot, the grip is strengthened, the moment of force on the axis is reduced, but still, with a “tight” entry into the material, additional efforts have to be made to hold the bit in the product.
Posidrive type slot (PZ) - is an improved version of Phillips, and is used in the production of screws and self-tapping screws for wood. In mechanical engineering and metalworking, posidrive is used much less frequently. Distinctive feature Splines are small additional recesses offset by 45 degrees relative to the main axes. They provide greater stability and protection against scrolling, although they do not completely solve it.
Posidrive screwdrivers are not pushed out of the slot when used - a more stable grip is formed, which reduces wear on the bit and the part itself.
Square splineRobertson (S.Q.) - was first produced in 1908 by the Canadian Robertson, who introduced it into production instead of a straight spline. Subsequently, he was in demand by Ford in his automobile industry until Robertson refused to sell him a license to manufacture and sell the spline, after which the sales project in the United States completely failed.
Now the design of a slotted clamp with a working part square section, used for heads metalworking tools and in fasteners. Robertson spline designed for quick socket changes hand tools with high reliability.
Hexagon spline (HX) - type of slot of threaded fasteners in the form regular hexagon. The angle between the sides is 120 degrees. The head of the fastener is usually cylindrical in shape with a hexagonal recess; to work with hexagonal slots, a screwdriver or a hexagonal bit is used.
Hexagonal screws are used in the mechanical engineering, furniture, aviation and automotive industries.
Spline typeTorx (TX) - type of slot in the shape of a six-pointed star.
This spline is capable of transmitting high torque without deforming the bit or tool. Fasteners with TX slots are usually used in technology: cars, bicycles, brake systems, various prefabricated metal structures, computer hard drives, ATMs, consumer electronics and fuel equipment.
Thanks to the reduced radial load, tool and bit life is extended. This is achieved due to the fact that the angle between the edges is only 15 degrees. This geometry creates virtually no stress. Unlike cross profiles, TORX does not require any effort to drive the screws, and there is no slipping effect, which is common, for example, in a negative slot. Thus, the force transmitted through this spline will be much greater under normal application force.
Please note that there is a difference between a TORX and a TORX PLUS slot: in fact, it is possible to screw a TORX PLUS screw with a TORX screwdriver, but this will lead to rapid wear of both the screwdriver and the slot itself.
TORX Tamper Resistant (TXH) prevents unintentional screw removal. The only difference with regular TORX® is the hole in the center of the bit and the small pin in the center of the screw.
Spline type 3VING denotes a special “three-bladed” type of slot for threaded fasteners and screwdrivers for them. Keys and screwdrivers are marked 3 V or TW(Tri-Wing). The 3VING slot was originally used in the aerospace industry, particularly for the assembly of wide-body aircraft, but later became used in other types of production, for example in the manufacture of electronic devices. This type of slot is also used in chargers NOKIA company.
Spline typeTORQ- SET denotes a special “four-blade” type of slot for threaded fasteners and screwdrivers for them. Keys and screwdrivers are marked 4 V or T.S.. The 4V slot is used only in the aerospace industry, although 4V screwdrivers are commercially available.
Spline typeONE- WAY(CL) - denotes special type slot of threaded fasteners and screwdrivers for them, intended only for tightening. When you try to unscrew the slot, the bit cam immediately pops out of the groove. However, there is a socket that can unscrew the CL spline. If such a “stray” is not at hand, all that remains is to drill out a screw or, after drilling two holes in it, unscrew it with a 2P bat. Fasteners with ONE-WAY slot can be used in public places to protect structures from vandalism.
Secret slot type fork wrench (2P) - with two rectangular cams, also known as "snake eyes". The slot is not designed to transmit high tightening torque, and the force is transmitted here only through two pins, which does not allow overtightening the screw.
This type is used in elevator panels, in some waiting rooms, in the subway, and also for tightening spikes in some types of shoes.
There is also a variation of the bat - with three pins, which, for example, is used in clutches of bladed weapons and firearms.
Round head hex type Hexagon Balldrive (HB)- allows you to reach hard-to-reach places at an angle of up to 25 degrees. They are quickly and completely inserted into the recess and reduce the problem of “breaking” edges.
Spline typeSpline (SP) - slot in the form of a twelve-pointed star. The tightening force is evenly distributed across all rays of the star, providing the ability to transmit a high tightening torque.
That's why this type The spline is widely used for tightening cylinder heads and other engine connections.
A feature of the SP type is a tight fit and maximum coincidence of the contours of the bit and the product, therefore, if dirt and dust particles get inside the bolt, the bit deviates from the axis and can cut off the inner edges of the product and its teeth.
Triangular head slot (TR) - a type of security slot used by railways, fire services, and also in radio electronics.
The design is equilateral triangle. The spline is not designed to transmit high torque due to its small area.
