Product Description
Products Description
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material available |
stainless steel, brass, copper, aluminum, carbon steel, alloy steel etc. |
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surface treatment |
polishing,plating,electrophoresis,anodizing or as your request |
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applications |
automotive, instrument, electrical equipment, household appliances, furniture, mechanical equipment, daily living equipment etc. |
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our features |
a company with industry and trade integration | ||
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tolerance |
± 0.01mm |
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quality control |
100% inspection before shipment |
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packaging |
polybag + carton box + pallet, or as per customers’ requirement |
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lead time |
3-7 days for sample, and 30 days for mass production generally. |
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testing equipment |
projecting apparatus, salt spray test, durometer, and coating thickness tester |
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our service |
1.Stamping parts |
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OEM ODM High Precision Aluminum Spindle Shaft, Driving Motor Shaft With Good Price
Company Profile
Our company was founded in October, 2000, specializing in the production of cnc milling auto lathe, stamping parts,
springs, shafts, screws, and other metal parts. Our main products modes are designing and proofing based on customers’
drawings or samples.
Product packaging
Certificate
Our Advantages
1.Provide OEM/ODM service and assembling service,since 2000
2.Social responsibility audit passed
3.One-stop purchasing service:Stamping parts,CNC milling parts,CNC turning parts,auto lathe parts,Springs,Shafts,fastener etc.
4.With professional engineers team can help you for projects research and development(R&D). Meanwhile we can suggest
the most suitable material and manufacturing progresses for your products to save the cost and ensure the quality and usage.
5.Product certification:RoHS,HE report available
6.Management certification:ISO/9001:2008 and TS16949 Passed
Recommend Products
FAQ
1.Q: Are you a manufacture or trading company?
A: We are a China Enterprises which has 16year-manufacturer in hardware products.
2.Q: Do you provide ODM/OEM service?
A: OEM / ODM is welcome, We got a professional and creative R&D team, and customized colors are optional. From the concept to finished goods, we do all ( design, prototype reviewing, tooling and production ) in the factory.
3.Q: Where is your factory located? How can I visit it?
A: Our factory is located in HangZhou, ZheJiang , HangZhou is the Closest city from HangZhou and HangZhou, hongkong. 1 hour from HangZhou and HangZhou by car. 1.5 hours flight from Hong Kong ( 1 hour by car+0.5 hour by boat ).
4.Q: Is it possible to know how are my products going on without visiting your company?
A: We will offer a detailed production schedule and send weekly reports with digital pictures and videos which show the machining progress.
5.Q: How can I get the sample? What’s the lead time?
A: Normally will be send in 7days. If need to open new Model, need another 10-15days more.
6.Q: What’s the lead time for mass production?
A: 20-25days after down payment confirmed, can be negotiable.
7.Q: If you make poor quality goods, will you refund our fund?
A: As a matter of fact, we wont take a chance to do poor quality products. Meanwhile, we manufacture goods quality products until your satisfaction.
8.Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock, or it is 15-30days if the goods are not in stock, it is according to quantity.
9.Q: Do you provide samples? is it free or extra?
A: Yes, we can provide samples, but need few samples charge, we need custom to do.
10.Q: What is your terms of payment?
A: Payment=1000 USD, 30% deposite, balance before delivery, 70% balance pay before delivery.
11.Q: How to order?
(1) You send us drawing or sample;
(2) We carry through project assessment;
(3) We give you a design;
(4) You think the design is ok;
(5) We make the sample and send it to you;
(6) You think the sample is good then place an order and pay us 30% deposite;
(7) We start to make the product;
(8) When the goods is done, we deliver it to HangZhou Xihu (West Lake) Dis.;
(9) You pay us the balance after you see the B/L Copy;
(10) The whole order is done, thank you!!!
How to contact us?
Send your inquiry Details in the Below, Click “Send” Now……
Screw Sizes and Their Uses
Screws have different sizes and features. This article will discuss screw sizes and their uses. There are 2 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 1 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 2 and 16 inches. A screw with a pointy tip has a smaller major diameter than 1 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 1 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 1 thread to the corresponding point on the next thread. Measurement is made from 1 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 1 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 2 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 2 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 2 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 2 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.
