China manufacturer Chooshin High Torque Involute Spline Twin Screw Extruder Shaft Customizable Screw Mandrel with Hot selling

Product Description

Product Description


1.According to different needs of customers: 

 Traditional spline milling mandrel
Cold rolling mandrel 

2. Processing range:
Length: within 15m
3. Spline type:
Single key slot
Hexagonal key
High torque rectangular key
Double keyway
Involute internal spline
Round keyway
Rectangular spline
Keyway designed according to customer requirements

4. Materials
Provide different materials to meet different needs of customers:
-Imported materials (imported from Japan & Germany)
-Domestic materials
-WR series materials

Advantages of cold rolling mandrel compared with traditional spline milling: 

It is a qualitative leap in spline machining process that the advanced cold extrusion process is used to replace the traditional mechanical cutting method. It not only improves the machining accuracy and surface finish, but also greatly improves the mechanical properties of parts.
The cold work hardening of metal after cold extrusion and the formation of reasonable fiber streamline distribution in the parts make the strength of spline much higher than that of mechanical cutting.
Through the test, the bearing torque of the mandrel processed by this process is increased by 25-30%, and the accuracy is improved by 2 levels, CZPT the international level 6 accuracy. In addition, the reasonable cold extrusion process can form compressive stress on the surface of the parts and improve the fatigue strength.

High toughness and strength
Strong comprehensive performance, CZPT to bear high torque, necessary for extruder
Fine processing, involute spline coaxiality ≤ 0.05mm

Cold rolling mandrel
Product introduction: 

     Designed for high-end users of twin-screw extruder: high torque, high strength and high precision extruder mandrel 

With the development of twin-screw extruder towards high speed and high torque, higher requirements are put forward for the strength (especially thermal strength) and accuracy of the mandrel of twin-screw extruder. Through extensive investigation and painstaking research, our company adopts pre hard alloy tool steel imported from Germany and cold rolling processing equipment imported from Europe for spline processing. After customer trial, our products fully meet the performance and quality requirements of similar high-end products imported from abroad.
Cold rolling mandrel production equipment

Comparison diagram of wear resistance and bearing maximum torque of different mandrel materials

2: Advantages of cold rolling mandrel compared with traditional cutting mandrel 

      Cold extrusion spline processing: 

Using advanced cold extrusion technology to replace the traditional mechanical cutting method to process splines is a qualitative leap in spline processing technology. It not only improves the machining accuracy and surface finish, but also greatly improves the mechanical properties of parts.

The cold work hardening of the metal after cold extrusion and the formation of reasonable fiber streamline distribution in the parts make the strength of the spline much higher than that processed by mechanical cutting.

Through the test, the bearing torque of the mandrel processed by this process is increased by 25 ~ 30%, and the accuracy is improved by 2 levels, CZPT the accuracy of grade 6 of the national standard. In addition, a reasonable cold extrusion process can form compressive stress on the surface of the parts and improve the fatigue strength.

Company Profile


ZheJiang Chooshin Industrial Co., LTD

Chooshin industrial co., ltd. is an international and specialized high-tech company engaged in the manufacture of polymer material processing equipment. Zeuxing is committed to the independent design and development of new technology and equipment related to polymer material processing equipment, equipment processing and manufacturing, and project complete set service business, and long-term focus on promoting the continuous development of high-end technology products and project complete set technology.

The company has rich talent reserve and technical experience in the field of polymer equipment manufacturing, and its technical development team has 20 years of experience in the development of complete sets of polymer blending and modification equipment. At the same time, it maintains in-depth cooperation with domestic universities and research institutes and advanced extruder companies abroad.

Company location


Assembly shop


Our Advantages


* With an experienced design and development team, the company has formed a very concentrated talent resource advantage in this field in China.

* Nearly 20 years of co-direction twin screw research and development and rich practice closely combined with many polymer material technology, integrating mechanical manufacturing, electrometer design and development and polymer material technology as a whole;

* With CNC machining center as the core, the industry leading modern production and manufacturing platform has been realized. Formed a set of design, manufacturing and application of 3 key technologies in 1 of the comprehensive advantages;

* Based on the research and practice of the internal relationship and process law between the modern emerging polymer material technology and polymer equipment, relying on the increasingly perfect and domestic leading test research and development center, it can realize the integration and seamless connection of theory, test and engineering application technology.

* Relying on the above advantages of resource integration, the company has and will continue to strengthen the ability of independent innovation and extended technology development.





Q: Are you trading company or manufacturer?
A: We are factory.We have the technical production team,and the workers are all very experienced.

Q: Why choose you?
A:You can get a very fair price from us and our price can make you beat your competitors in the marke

Q: What kind of certification do you have?
A: Our products have obtained ISO9001 and CE certification,the quality can be guaranteed.


Screw Shaft Types and Uses

Various uses for the screw shaft are numerous. Its major diameter is the most significant characteristic, while other aspects include material and function are important. Let us explore these topics in more detail. There are many different types of screw shafts, which include bronze, brass, titanium, and stainless steel. Read on to learn about the most common types. Listed below are some of the most common uses for a screw shaft. These include: C-clamps, screw jacks, vises, and more.

Major diameter of a screw shaft

A screw’s major diameter is measured in fractions of an inch. This measurement is commonly found on the screw label. A screw with a major diameter less than 1/4″ is labeled #0 to #14; those with a larger diameter are labeled fractions of an inch in a corresponding decimal scale. The length of a screw, also known as the shaft, is another measure used for the screw.
The major diameter of a screw shaft is the greater of its 2 outer diameters. When determining the major diameter of a screw, use a caliper, micrometer, or steel rule to make an accurate measurement. Generally, the first number in the thread designation refers to the major diameter. Therefore, if a screw has a thread of 1/2-10 Acme, the major diameter of the thread is.500 inches. The major diameter of the screw shaft will be smaller or larger than the original diameter, so it’s a good idea to measure the section of the screw that’s least used.
Another important measurement is the pitch. This measures the distance between 1 thread’s tip and the next thread’s corresponding point. Pitch is an important measurement because it refers to the distance a screw will advance in 1 turn. While lead and pitch are 2 separate concepts, they are often used interchangeably. As such, it’s important to know how to use them properly. This will make it easier to understand how to select the correct screw.
There are 3 different types of threads. The UTS and ISO metric threads are similar, but their common values for Dmaj and Pmaj are different. A screw’s major diameter is the largest diameter, while the minor diameter is the lowest. A nut’s major diameter, or the minor diameter, is also called the nut’s inside diameter. A bolt’s major diameter and minor diameter are measured with go/no-go gauges or by using an optical comparator.
The British Association and American Society of Mechanical Engineers standardized screw threads in the 1840s. A standard named “British Standard Whitworth” became a common standard for screw threads in the United States through the 1860s. In 1864, William Sellers proposed a new standard that simplified the Whitworth thread and had a 55 degree angle at the tip. Both standards were widely accepted. The major diameter of a screw shaft can vary from 1 manufacturer to another, so it’s important to know what size screw you’re looking for.
In addition to the thread angle, a screw’s major diameter determines the features it has and how it should be used. A screw’s point, or “thread”, is usually spiky and used to drill into an object. A flat tipped screw, on the other hand, is flat and requires a pre-drilled hole for installation. Finally, the diameter of a screw bolt is determined by the major and minor diameters.

Material of a screw shaft

A screw shaft is a piece of machine equipment used to move raw materials. The screw shaft typically comprises a raw material w. For a particular screw to function correctly, the raw material must be sized properly. In general, screw shafts should have an axial-direction length L equal to the moving amount k per 1/2 rotation of the screw. The screw shaft must also have a proper contact angle ph1 in order to prevent raw material from penetrating the screw shaft.
The material used for the shaft depends on its application. A screw with a ball bearing will work better with a steel shaft than 1 made of aluminum. Aluminum screw shafts are the most commonly used for this application. Other materials include titanium. Some manufacturers also prefer stainless steel. However, if you want a screw with a more modern appearance, a titanium shaft is the way to go. In addition to that, screws with a chromium finish have better wear resistance.
The material of a screw shaft is important for a variety of applications. It needs to have high precision threads and ridges to perform its function. Manufacturers often use high-precision CNC machines and lathes to create screw shafts. Different screw shafts can have varying sizes and shapes, and each 1 will have different applications. Listed below are the different materials used for screw shafts. If you’re looking for a high-quality screw shaft, you should shop around.
A lead screw has an inverse relationship between contact surface pressure and sliding velocity. For heavier axial loads, a reduced rotation speed is needed. This curve will vary depending on the material used for the screw shaft and its lubrication conditions. Another important factor is end fixity. The material of a screw shaft can be either fixed or free, so make sure to consider this factor when choosing the material of your screw. The latter can also influence the critical speed and rigidity of the screw.
A screw shaft’s major diameter is the distance between the outer edge of the thread and the inner smooth part. Screw shafts are typically between 2 and 16 millimeters in diameter. They feature a cylindrical shape, a pointy tip, and a wider head and drive than the former. There are 2 basic types of screw heads: threaded and non-threaded. These have different properties and purposes.
Lead screws are a cost-effective alternative to ball screws, and are used for low power and light to medium-duty applications. They offer some advantages, but are not recommended for continuous power transmission. But lead screws are often quieter and smaller, which make them useful for many applications. Besides, they are often used in a kinematic pair with a nut object. They are also used to position objects.

Function of a screw shaft

When choosing a screw for a linear motion system, there are many factors that should be considered, such as the position of the actuator and the screw and nut selection. Other considerations include the overall length of travel, the fastest move profile, the duty cycle, and the repeatability of the system. As a result, screw technology plays a critical role in the overall performance of a system. Here are the key factors to consider when choosing a screw.
Screws are designed with an external threading that digs out material from a surface or object. Not all screw shafts have complete threading, however. These are known as partially threaded screws. Fully threaded screws feature complete external threading on the shaft and a pointed tip. In addition to their use as fasteners, they can be used to secure and tighten many different types of objects and appliances.
Another factor to consider is axial force. The higher the force, the bigger the screw needs to be. Moreover, screws are similar to columns that are subject to both tension and compression loads. During the compression load, bowing or deflection is not desirable, so the integrity of the screw is important. So, consider the design considerations of your screw shaft and choose accordingly. You can also increase the torque by using different shaft sizes.
Shaft collars are also an important consideration. These are used to secure and position components on the shaft. They also act as stroke limiters and to retain sprocket hubs, bearings, and shaft protectors. They are available in several different styles. In addition to single and double split shaft collars, they can be threaded or set screw. To ensure that a screw collar will fit tightly to the shaft, the cap must not be overtightened.
Screws can be cylindrical or conical and vary in length and diameter. They feature a thread that mates with a complementary helix in the material being screwed into. A self-tapping screw will create a complementary helix during driving, creating a complementary helix that allows the screw to work with the material. A screw head is also an essential part of a screw, providing gripping power and compression to the screw.
A screw’s pitch and lead are also important parameters to consider. The pitch of the screw is the distance between the crests of the threads, which increases mechanical advantage. If the pitch is too small, vibrations will occur. If the pitch is too small, the screw may cause excessive wear and tear on the machine and void its intended purpose. The screw will be useless if it can’t be adjusted. And if it can’t fit a shaft with the required diameter, then it isn’t a good choice.
Despite being the most common type, there are various types of screws that differ in their functions. For example, a machine screw has a round head, while a truss head has a lower-profile dome. An oval-its point screw is a good choice for situations where the screw needs to be adjusted frequently. Another type is a soft nylon tip, which looks like a Half-dog point. It is used to grip textured or curved surfaces.

China manufacturer Chooshin High Torque Involute Spline Twin Screw Extruder Shaft Customizable Screw Mandrel   with Hot sellingChina manufacturer Chooshin High Torque Involute Spline Twin Screw Extruder Shaft Customizable Screw Mandrel   with Hot selling