China 25A Spare Parts Screw Element and Shaft for Plastic Extruder set screw shaft coupling

Product Description

HangZhou Joiner Equipment Co.,Ltd set up in 2007 in ZheJiang , is a professional company of spare elements for twin screw extruder :Barrel &Screw phase &Shaft &Aspect feeder.

It occupies 12600 square meters with in excess of 120 staffs and sixty sets of advanced processing equipments in our plants.These kinds of as the CNC thread grinding machine, the CNC screw milling, the CNC lathe, the CNC surface grinder, the CNC cylindrical grinder, the CNC sawing device, the computerized deep hole grinding equipment, the CNC lathe, the CNC surface grinder, the CNC cylindrical grinder, the CNC sawing equipment, the laser marking machine, the vacuum quenching furnace, the vacuum tempering CZPT and so on.In the end,We became one-stop producer for all services and thus ensure the good quality by means of the inside management. There are also some advanced testing equipments, this sort of as the metallographic analyzer, the CZPT roughness meter, the Japanese Mitutoyo peak gauge, the CMM, the Rockwell hardness tester,Vickers hardness tester and some other innovative tests equipments. Which make certain the products 100% controllable. we have in excess of twenty many years of encounter in provide and refurbishment for dress in components.

Inspection of all the screw aspect, Barrels, Joiner will completely examine all parts for Dress in, Cracks, Imperfections, Straightness, and Concentricity. Joiner will restore broken barrels, and other factors.Inspections need to be carried out to decide the severity of injury and if reparation is an choice. All conclusions are documented in in depth reports with respective Suggestions.

  We manufacture screw and kneading segments for co-rotating twin screw extruders ranging from 15.6 mm to 350 mm and more than. Our production specializes in segmented screws for twin screw extruders and is optimized for versatile buy dealing with.

Co-rotating twin screw factors for 
-APV            -KOBE            -OMC
-Buhler            -Theysohn
-Buss               -Toshiba
-Clextral       -Labtech          -USEON     -Lantai          – others
-JSW          -Leistritz    
-Keya        -Maris

Sorts of the Screw Segments
* Express Screw Section
* Mixing Screw Segment
* Kneading Block & Disk
* Changeover Screw Element
* Deep groove transfer component
* Screw component for side feeder
* 1-flighted,2-flighted,3-flighted screw elements

We offer you a broader decision of resources:
For use application:
* Tool Metal : W6Mo5Cr4V2
* PM-HIP content : SAM10,SAM26,SAM39,CPM10V,CPM9V
For corrision software:
* Nitrided Steel: 38CrMoAI
* PM-HIP materials : SAM26,SAM39,CPM10V,CPM9V
For use and corrision application:
* PM-HIP material:SAM26,SAM39,CPM10V,CPM9V
Other resources:
Stainless Metal: 316L,C276 and so forth.
By operating closely with customers in choosing optional components,we can decrease put on and tear and related costs.

About our Company

Joiner Machinery Co.,Ltd has many several years knowledge in the manufacture and provide of new and refurbished put on components for all major can make of twin-screw extruders and the Industries included in plastics business, chemical business, powder coating, meals foodstuff business, wooden plastic and so on..
Through near operating interactions with our clients we have been CZPT to satisfy their requirements. Flexibility allows us to layout and manufacture normal and bespoke components for unique applications. 
By means of our hugely educated and knowledgeable personnel we are CZPT to provide complex assist and suggestions. 

Our strengths are based mostly on numerous years expertise providing the adhering to:
* Competitive fees per device of production 
* Fast turn spherical for collection and shipping on refurbished parts 
* Areas offered from stock for a wide range of extruder makes 
* Thorough inspection process on all components prior to dispatch 
* A time verified quality service 
* Newest production methods and metallurgy, making sure regular and trustworthy overall performance of parts 
* Customized solutions to fulfill distinct demands.

one. Q: Are you a factory or trading company? 
 —-A: A factory
two. Q: Where is your factory located? How can I visit there? 
—–A: Our factory is located in HangZhou, ZheJiang  Province, China, 
one) You can fly to HangZhou Airport directly. We will pick you up when you get there in the airport 
All our clients, from domestic or abroad, are warmly welcome to visit us! 
three.Q: What makes you different with others?
—-A: 1) Our Excellent Service 
 For a quick, no hassle quote just send email to us
 We promise to reply with a price within 24 hours – sometimes even within the hour.
 If you need an advice, just call our export office at   571 87226313, we will answer your questions immediately.
two) Our quick manufacturing time
For Normal orders, we will promise to produce within 30 working days.
As a manufacturer, we can ensure the delivery time according to the formal contract.
 4.Q: How about the delivery time? 
—-A: This depends on the product. Typically standard products are delivered within 30 days. 

  1.  Q: What is the term of payment? 
    —-A: 1) T/T payment   2) LC  

6.Q: May I know the status of my order?
—-A: Yes .We will send you information and photos at different production stage of your order. You will get the latest information in time. 


US $5-20
/ Piece
10 Pieces

(Min. Order)


Transport Package: Wood
Trademark: JOINER
Origin: Sichuan


US$ 5/Piece
1 Piece(Min.Order)

Request Sample


US $5-20
/ Piece
10 Pieces

(Min. Order)


Transport Package: Wood
Trademark: JOINER
Origin: Sichuan


US$ 5/Piece
1 Piece(Min.Order)

Request Sample



Screw Sizes and Their Uses

Screws have different sizes and features. This article will discuss screw sizes and their uses. There are two main types: right-handed and left-handed screw shafts. Each screw features a point that drills into the object. Flat tipped screws, on the other hand, need a pre-drilled hole. These screw sizes are determined by the major and minor diameters. To determine which size of screw you need, measure the diameter of the hole and the screw bolt’s thread depth.

The major diameter of a screw shaft

The major diameter of a screw shaft is the distance from the outer edge of the thread on one side to the tip of the other. The minor diameter is the inner smooth part of the screw shaft. The major diameter of a screw is typically between two and sixteen inches. A screw with a pointy tip has a smaller major diameter than one without. In addition, a screw with a larger major diameter will have a wider head and drive.
The thread of a screw is usually characterized by its pitch and angle of engagement. The pitch is the angle formed by the helix of a thread, while the crest forms the surface of the thread corresponding to the major diameter of the screw. The pitch angle is the angle between the gear axis and the pitch surface. Screws without self-locking threads have multiple starts, or helical threads.
The pitch is a crucial component of a screw’s threading system. Pitch is the distance from a given thread point to the corresponding point of the next thread on the same shaft. The pitch line is one element of pitch diameter. The pitch line, or lead, is a crucial dimension for the thread of a screw, as it controls the amount of thread that will advance during a single turn.

The pitch diameter of a screw shaft

When choosing the appropriate screw, it is important to know its pitch diameter and pitch line. The pitch line designates the distance between adjacent thread sides. The pitch diameter is also known as the mean area of the screw shaft. Both of these dimensions are important when choosing the correct screw. A screw with a pitch of 1/8 will have a mechanical advantage of 6.3. For more information, consult an application engineer at Roton.
The pitch diameter of a screw shaft is measured as the distance between the crest and the root of the thread. Threads that are too long or too short will not fit together in an assembly. To measure pitch, use a measuring tool with a metric scale. If the pitch is too small, it will cause the screw to loosen or get stuck. Increasing the pitch will prevent this problem. As a result, screw diameter is critical.
The pitch diameter of a screw shaft is measured from the crest of one thread to the corresponding point on the next thread. Measurement is made from one thread to another, which is then measured using the pitch. Alternatively, the pitch diameter can be approximated by averaging the major and minor diameters. In most cases, the pitch diameter of a screw shaft is equal to the difference between the two.

The thread depth of a screw shaft

Often referred to as the major diameter, the thread depth is the outermost diameter of the screw. To measure the thread depth of a screw, use a steel rule, micrometer, or caliper. In general, the first number in the thread designation indicates the major diameter of the thread. If a section of the screw is worn, the thread depth will be smaller, and vice versa. Therefore, it is good practice to measure the section of the screw that receives the least amount of use.
In screw manufacturing, the thread depth is measured from the crest of the screw to the root. The pitch diameter is halfway between the major and minor diameters. The lead diameter represents the amount of linear distance traveled in one revolution. As the lead increases, the load capacity decreases. This measurement is primarily used in the construction of screws. However, it should not be used for precision machines. The thread depth of a screw shaft is essential for achieving accurate screw installation.
To measure the thread depth of a screw shaft, the manufacturer must first determine how much material the thread is exposed to. If the thread is exposed to side loads, it can cause the nut to wedge. Because the nut will be side loaded, its thread flanks will contact the nut. The less clearance between the nut and the screw, the lower the clearance between the nut and the screw. However, if the thread is centralized, there is no risk of the nut wedgeing.

The lead of a screw shaft

Pitch and lead are two measurements of a screw’s linear distance per turn. They’re often used interchangeably, but their definitions are not the same. The difference between them lies in the axial distance between adjacent threads. For single-start screws, the pitch is equal to the lead, while the lead of a multi-start screw is greater than the pitch. This difference is often referred to as backlash.
There are two ways to calculate the pitch and lead of a screw. For single-start screws, the lead and pitch are equal. Multiple-start screws, on the other hand, have multiple starts. The pitch of a multiple-start screw is the same as its lead, but with two or more threads running the length of the screw shaft. A square-thread screw is a better choice in applications requiring high load-bearing capacity and minimal friction losses.
The PV curve defines the safe operating limits of lead screw assemblies. It describes the inverse relationship between contact surface pressure and sliding velocity. As the load increases, the lead screw assembly must slow down in order to prevent irreversible damage from frictional heat. Furthermore, a lead screw assembly with a polymer nut must reduce rpm as the load increases. The more speed, the lower the load capacity. But, the PV factor must be below the maximum allowed value of the material used to make the screw shaft.

The thread angle of a screw shaft

The angle between the axes of a thread and the helix of a thread is called the thread angle. A unified thread has a 60-degree angle in all directions. Screws can have either a tapped hole or a captive screw. The screw pitch is measured in millimeters (mm) and is usually equal to the screw major diameter. In most cases, the thread angle will be equal to 60-degrees.
Screws with different angles have various degrees of thread. Originally, this was a problem because of the inconsistency in the threading. However, Sellers’s thread was easier to manufacture and was soon adopted as a standard throughout the United States. The United States government began to adopt this thread standard in the mid-1800s, and several influential corporations in the railroad industry endorsed it. The resulting standard is called the United States Standard thread, and it became part of the ASA’s Vol. 1 publication.
There are two types of screw threads: coarse and fine. The latter is easier to tighten and achieves tension at lower torques. On the other hand, the coarse thread is deeper than the fine one, making it easier to apply torque to the screw. The thread angle of a screw shaft will vary from bolt to bolt, but they will both fit in the same screw. This makes it easier to select the correct screw.

The tapped hole (or nut) into which the screw fits

A screw can be re-threaded without having to replace it altogether. The process is different than that of a standard bolt, because it requires threading and tapping. The size of a screw is typically specified by its major and minor diameters, which is the inside distance between threads. The thread pitch, which is the distance between each thread, is also specified. Thread pitch is often expressed in threads per inch.
Screws and bolts have different thread pitches. A coarse thread has fewer threads per inch and a longer distance between threads. It is therefore larger in diameter and longer than the material it is screwed into. A coarse thread is often designated with an “A” or “B” letter. The latter is generally used in smaller-scale metalworking applications. The class of threading is called a “threaded hole” and is designated by a letter.
A tapped hole is often a complication. There is a wide range of variations between the sizes of threaded holes and nut threads, so the tapped hole is a critical dimension in many applications. However, even if you choose a threaded screw that meets the requisite tolerance, there may be a mismatch in the thread pitch. This can prevent the screw from freely rotating.

China 25A Spare Parts Screw Element and Shaft for Plastic Extruder     set screw shaft couplingChina 25A Spare Parts Screw Element and Shaft for Plastic Extruder     set screw shaft coupling
editor by czh 2022-12-19

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