China manufacturer Linear Shaft Support Bearing Sk16 Sk20 Sk25 Sk30 Sh16sh20sh25sh30 with Great quality

Product Description

linear Shaft Support bearing SK16 SK20 SK25 SK30 SH16SH20SH25SH30

1.low cost 
2.linear motion system 
3.small load 
4.high-precision smooth movement
5.HS code:8483 3000

China Manufacturer Linear Bearing
1). Metal linear bearing and Plastic linear bearing  
2). Standard, Clearance SetUp Coordinate linear bearing,  Open mouth linear bearing ,The stretched linear bearing 
3). Flange linear bearing can be divided into: round flange type, method, elliptical flange, round flange type, guidance method orchid type, orientation ellipse flange type, extended type circular flange .
4). LM and LME series. Its code LM series used in Asia, southeast Asia, Japan, South Korea, China, etc. Metric size as standard, with the straight axis diameter tolerance is usually h7. LME series is much used in Europe, the United States, Germany, Italy and other regions. Inch size as standard and metric size, with the straight axis diameter tolerance is usually g6. Two big series structure features, in addition to the different size, diameter tolerance is different, its structure is roughly the same.  
5.)Plastic linear bearing can be divided into two major series with LIN -12 and LIN – 11 series Its code name LIN – 11 is the representative of a European standard plastic linear bearing, and LIN – 12 series is narrow type design, mainly in order to save installation space and design; Distinguishes between two major series, LIN – 11 series is using circlip limit installation, and LIN – 12 series is directly mounted with its diameter and installing seat hole tight fit. 

model shaft dimension(mm) weight(gf)
h A W H T E D C B S J
Sk8 Ф8 20 21 42 32.8 6 18 5 32 14 Ф3.5 M3 24
Sk10 Ф10 23 21 42 32.8 6 18 5 32 14 Ф3.5 M3 24
Sk10 20
Sk12 Ф12 23 21 42 38 6 20 5 32 14 Ф5.5 M4 30
Sk13 Ф13 23 21 42 38 6 20 5 32 14 Ф5.5 M4 30
Sk16 Ф16 27 24 48 44 8 25 5 38 16 Ф5.5 M4 40
Sk20 Ф20 31 30 60 51 10 30 7.5 45 20 Ф6.6 M5 70
Sk25 Ф25 35 35 70 60 12 38 7 56 24 Ф6.6 M6 130
Sk30 Ф30 42 42 84 70 12 44 10 64 28 Ф9 M6 180
Sk35 Ф35 50 49 98 85 15 50 12 74 32 Ф11 M8 270
Sk40 Ф40 60 57 114 96 15 60 12 90 36 Ф11 M8 420
Sk50 Ф50 70 63 126 120 18 74 14 100 40 Ф14 M12 750
Sk60 Ф60 80 74 148 136 18 90 14 120 45 Ф14 M12 1100

THK linear bearing / linear slide ball bearing HSR series dimension:

Model No.   Main dimensions Basic load rating  
Clear anceadjustable 
OpenType Ball rows Inscaibed 
bore diameter 
Length Dynamic 
        dr D L C C0  
        mm mm mm N N G
LM 20 LM20-RJ LM20-OP 5 20 32 42 863 1370 87

THK linear bearing / linear slide ball bearing main used:
THK linear bearings are used in conjunction with quenching. For the infinite linear motion system.
Load balls and hardened shaft because it is point contact, allowing smaller loads, but the straight line movement, minimal friction, high precision and fast motion. 

The linear bearing / linear slide ball bearing type we supply:

Normal Type Open Typer Flange Type LMF Flange Type LMK
LM 3 LM 12-OP LMF 6 LMK 6
LM 5 LM 16-OP LMF 8 LMK 8
LM 6 LM 20-OP LMF 10 LMK 10
LM 8S LM 25-OP LMF 12 LMK 12
LM 8 LM 30-OP LMF 13 LMK 13
LM 10 LM 35-OP LMF 16 LMK 16
LM 12 LM 40-OP LMF 20 LMK 20
LM 13 LM 50-OP LMF 25 LMK 25
LM 16 LM 60-OP LMF 30 LMK 30
LM 20 LM 12GR-OP LMF 35 LMK 35
LM 25 LM 13GR-OP LMF 40 LMK 40
LM 30 LM 16GR-OP LMF 50 LMK 50
LM 35 LM 20GR-OP LMF 60 LMK 60
LM 40 LM 25GR-OP    
LM 50 LM 30GR-OP    
LM 60      


SHS 15C   SSR 15XW HSR 15A
SHS 15V   SSR 35XW HSR 35A
SHS 65V    

Our payment terms:
1.100% T/T in advance
2.100% Western Union or paypal in advance ,specially for small amount
3.30% T/T in advance, balance before shipment for large order or long delivery time orders
4.100% irrevocable L/C at sight

Screw Shaft Types

If you’re looking for a screw shaft, but aren’t sure which type to buy, you’re in luck. In this article, we’ll talk about the different types, including Threaded shank, Round head, and Machined. Once you’ve read it, you’ll know which type to buy. Then, you can decide whether you want a ball screw nut or a threaded shank.

Machined screw shafts

Besides the standard stainless steel shaft, manufacturers also provide a variety of other materials, such as titanium, bronze, and brass. In addition to stainless steel, manufacturers also provide a variety of top-coating options, including zinc, brass, and chromium. Aluminum screws are not particularly durable and are easily affected by weather. Most screw shafts feature self-locking mechanisms. They are especially useful in C-clamps, vises, and screw-top container lids.
For applications where accuracy is vital, a ball screw shaft needs to be annealed. A heat treatment can be performed on the ball screw shaft to ensure that both ends are heated evenly. In this process, the shaft will be more durable, while maintaining its high-precision properties. These screw shafts are a key component in computer-controlled motion-control systems, wire bonding, and other industries that require high-precision and high-quality performance.
Depending on the material used, screw shafts can be made of stainless steel or titanium. High-precision CNC machines and lathes are typically used to manufacture screw shafts. Various shapes and sizes are available, each with a specific application. Whether you need a small or large screw, you can find 1 to fit your needs. And since each size requires a different material, your choice of material is important as well.
In general, the materials used for machining screw shafts are steel, stainless steel, titanium, brass, bronze, and aluminum. Metals that resist corrosion are also commonly used. Other materials for screw shafts are Teflon, nylon, and nylon. You can also find threaded screw shafts in materials such as porcelain, glass, and ceramic. If you want to use your screws in a unique material, consider purchasing a customized one.

Ball screw nuts

If you have a screw shaft, the last thing you want to worry about is the ball nut slipping off. To prevent this, you can place a temporary stop in the shaft’s grooves to ensure that the ball nut does not slide off. When you remove the stop, you can then install the ball screw nut. But, before you can install the ball screw nut, you have to make sure that you have a good grip on the shaft.
When selecting ball screw nuts, it’s important to consider how much preload you need to apply to avoid excessive backlash. Preloading eliminates this problem by making the ball nut compact. It also prevents backlash, which is lost motion caused by clearance between the ball and nut. Backlash disrupts repeatability and accuracy. This is where spacer preloading comes in. You can insert a spacer between the 2 ball nuts to transmit the force to the nut. However, you should keep in mind that this method reduces the load capacity of the ball screw.
The critical speed of a screw is the maximum rotating speed before it whips. This critical speed is influenced by several factors, including the diameter of the screw shaft, the number of support elements, and the material. By adjusting these factors, you can reduce the number of components used and the amount of time it takes to assemble the screw shaft. In addition, you can also reduce the number of components and avoid stacking tolerances. However, the critical speed of plastic nuts is limited due to sliding friction.
The ball screw nut has several characteristics that make it unique. Its most prominent feature is the presence of ball bearings. These balls help reduce friction between the screw nut and the shaft. Without ball bearings, the friction would be too high to function properly. Another important characteristic is the groove profile of the nut and ball. These 2 features ensure that the ball and the nut meet at 2 points. You’ll be amazed by the results of the work of these ball screw nuts.

Threaded shank

Wood screws are usually not fully threaded because the shank has an unthreaded portion at the top. This shoulder part forces the screw to compress 2 pieces of wood, which prevents the screw from overheating and compromising the materials strength. As the screw is threaded partially up, it is not as difficult to remove as a fully threaded screw. However, it is important to note that a wood screw will not hold as tightly as 1 with a fully threaded shank.
In addition to being universal, screw threads can be of different sizes. For example, a M8 screw has a thread pitch of 1.25 mm. To avoid confusion, screw thread pitches are commonly given with a multiplication sign. For example, M8x1 means that the screw is 8 mm in diameter but has a thread pitch of 1 mm per 360-degree rotation. Those who are not familiar with these dimensions may find it confusing.
The OD of the threaded portion of a bolt is generally smaller than the OD of the nut. If the shank is too deep for the nut to fit, the threads may bottom out. This is why it’s important to use a thread-cutting bit with a small thread diameter. You can use a micrometer or caliper to measure the thread diameter. This tool will also allow you to easily identify which screw size fits where and how well.
The metric system is the most widely used. Fasteners with DIN numbers are generally metric in size. This makes them very useful for industrial settings. You can find metric-sized screws anywhere, as long as you buy them from a reputable manufacturer. These fasteners also come with a dog point, which is used for safety wire. If the screw needs to be replaced, the shank can be drilled with a hole for a safety wire or for a dog-point.

Round head

A round head screw is the most common type used for machine screws. Other common types include truss head, flat head, and hexed head. Each has a different profile and are used for different purposes. A round head screw is typically wider than a flat or a hexed head, and has a slightly rounded surface. These screws are useful for projects involving sheet metal or sheet-metal parts. Round heads are usually slightly wider than a hex head screw, and they may also be used as a substitute for washers in certain applications. However, truss heads are not necessary for every project.
A wood screw has a smooth shank that protrudes above the surface of the material it is attaching. A metal screw has a threaded shaft that is fully threaded from head to point, and a fully threaded shaft provides more bite. Two common head styles are round head and pan head. If the task requires the screw to be flush or countersunk, the round head will be the best choice.
Another type is the Reed & Prince screw drive. These are similar to Phillips screws but have a 75-degree V shape. They are commonly used in marine hardware and are also known as BNAE NFL22-070. This type is also used for steel plate hangers. In addition to round head and pan head screws, there are a variety of other screw types. You can even get a head with a slotted head if you know where to look.
Screw diameters are specified according to the ISO 261 or ISO 262 standards. An M8 screw has a diameter of 8.25 mm. The M8 screw has a pitch of 1.25 mm, which is equivalent to 1 mm per 360 degrees. There are several other standard screw sizes and thread diameters available. You can find them all by consulting the relevant standards. But remember, the metric system is the most popular.

Self-locking mechanism

A self-locking mechanism for a screw shaft is a device that secures the screw to its supporting member in a failure position. The locking mechanism provides a positive connection between the screw shaft and the control surface during normal operation, and locks the screw to its supporting member when the screw fails. Previous attempts to solve this problem have typically used secondary nuts with free play on the screw, which were intentionally designed to jam when loaded. However, such a device can be unreliable, which is why the present invention offers a more robust and reliable locking mechanism.
The self-locking function of a screw depends on several factors, including its pitch angle and the coefficient of friction of the threads. The angle of friction must be less than the tangent of the material pairing to prevent untightening of the screw. Screws with self-locking mechanisms have an efficiency e lower than 50%, which is less than half. Self-locking screws also have the benefit of being less efficient than a standard screw.
Unlike a normal screw, a self-locking screw can be turned in either direction. The nut 22 rotates with the screw shaft, and the member 23 is translated in an axial direction. Regardless of the direction of the rotation of the screw, this axial translation will result in the opposite moment to that input moment. While screw self-locking mechanisms are typically less expensive, they are more reliable and durable.
Another important feature of self-locking screws is that they are not susceptible to independent loosening. The screw cannot rotate without a certain amount of torque. In addition, a self-locking screw shaft must have a small wedge with a smaller half-angle than the arctangent of the static friction. This means that the torque applied by the driver must be greater than the torque needed to overcome the friction.

China manufacturer Linear Shaft Support Bearing Sk16 Sk20 Sk25 Sk30 Sh16sh20sh25sh30   with Great qualityChina manufacturer Linear Shaft Support Bearing Sk16 Sk20 Sk25 Sk30 Sh16sh20sh25sh30   with Great quality