Item Description
AT PRECAST,a producer of precast concrete accessories which includes the Lifting Systems , Anchoring techniques, Coil and Ferrule Inserts, with much more than thirteen several years expertise.
Fast Information
Packaging & Shipping
Expansion Anchor
ABOUT US:
As your one-end source, AT PRECAST,we style, company and distribute precast concrete equipment including the Lifting Systems and Anchoring programs Coil and Ferrule Inserts. for Concrete and Prefabricated area.
As a leader in creating concrete accent merchandise, our major goal is to make merchandise that are safer, more rapidly and more price effective.
With much more than completely 50 years functioning expertise, our whole personnel is focused to give you with the greatest buyer service and aggressive prices. Our sales pressure are CZPT to answer your inquiries rapidly and supply you complex assist .
Assurance,
100% quality manufacturing.
We guarantee that our products meet your supplied specifications
Extremely competitive pricing
Delivery to your port or front door
4 —- 8 week lead times
We handle all paperwork
Partial container orders
Flexible payment options
Unique tooling options
Full range of packaging options from bulk to retail ready
Complete testing services available
FAQs
1. Where is your spot?
We are found in HangZhou Metropolis of China and are shut to Airport. It normally takes 30minuts by vehicle from Liuting Airport our business.
2. How long has the organization been established?
AT Business was recognized in 2009. There is 6 many years exporting activities.
three. How many staff do you have?
Administration / sales 4
Engineering / design as our partner 8
Production as our associates 120
High quality assurance / inspection ten
four. Which international locations do you export to?
U.S.A, Germany, France, Italy, United kingdom, Brazil, Center east of Asia, Thailand,
five. What proportion of your goods are exported?
100% of our generation are exported to all above the globe.
six. How extended does it take to obtain samples?
a) Pattern:30-45days after order
b) Sample:30days right after sample ending.
c) The lead time is the general manufacturing interval and does not consist of the transportation time.
seven. New solution growth method
Acquired tooling purchase and sample get with 50% deposit—Hold a assembly with the relation dept. to make sure the creating plan—Style sample, fixture and gauge and making them in our residence—mould metal acquiring—Machining—Inspection—Ship out the sample with preliminary inspection report.
8. How prolonged is the production direct time?
Mass Production: 90days right after sample acceptance by yours.
The lead time is the basic generation period including the transportation time.
We could make some special production arrangement properly if customer has urgent need.
9. What basis can we acquire items?
We usually supply customers charges FOB& CIF (Carriage, Insurance & Freight). The CIF contains the freight price to your nominated sea port.
We do offer clearance of items which demands to be managed by a local freight forwarder.
All local fees and taxes are the duty of the consumer. We are happy to offer advisement on delivery if required.
ten. What are the payment conditions?
Payment conditions are negotiable and will enhance for prolonged expression clients.
For the duration of the preliminary levels, we ask for 50% of tooling price in advance with the equilibrium payable on acceptance of samples.
Creation orders can be negotiable. We favor fifty% deposit and the harmony by T/T before sails. But at times T/T thirty days soon after sails would also appropriate.
eleven. Which currency can we acquire in?
We can offer in USD / Euro forex / GBP.
twelve. How prolonged does it just take to ship goods from China by sea?
It takes about 5 weeks to European ports furthermore 1 week customs clearance, so you can get the container inside 6 to 7 months. It takes about 2 months to east coast and 3 weeks to west coastline US ports. All sea items are delivered from HangZhou Port.
thirteen. How extended does it get to ship products from China by air?
It requires about 7 days to all main places.
fourteen. Can we check out the manufacturing facility to perform an audit?
Sure, you are welcome to go to our associate manufacturing unit by prior settlement.
fifteen. How do we retain shopper confidentiality?
We are pleased to indicator Confidentiality Agreements with customers and will honor them.
16. Which languages do we do business in?
Though we do company with a lot of international locations close to the entire world, we can only talk properly in Chinese English.
All details supplied should as a result be equipped in this sort.
17. Is there a bare minimum quantity of organization essential to perform international purchasing?
There are no minimal volumes, but the rates of the products, additionally the fastened expenses of importing helps make it a lot more inexpensive to purchase in substantial volumes. All prospective buyers will be assessed on an personal foundation to determine if it seems a feasible selection for all functions to build a partnership.
18. What kind of areas you are specialised in?
Our company includes 2 locations,
a single is for development precast which includes lifting system, rigging hardware steel components.
An additional is custom-made metal organization of quality sand castings, investment castings, lost foam castings, hot forgings, cold forgings, stampings, machined parts, injectionmolded plastics parts, etc.
19. Which type of equipments do you have?
Forging friction press 160Ton, 300Ton, 630Ton, 1200Ton
Casting CZPT of 200kg, 500kg,1000kgs, 2000kgs
Push of 63ton, 120tons
CNC Machining heart
CNC Vertical Lathe
CNC Lathe heart
Dull device
Drilling machine
| Place of Origin: |
Shandong China (Mainland)
|
Brand Name: |
AT
|
Model Number: |
GT-ANCHOR
|
| Type: |
Expansion Anchor
|
Material: |
Steel
|
Diameter: |
M6-M16
|
| Length: |
50mm-150mm
|
Capacity: |
1.4KN-4.0KN
|
Standard: |
GB,GB, DIN, ISO, ANSI/ASTM, B7, BS, JIS etc
|
| Size: |
M6-M16
|
Finish: |
Zinc plated, YZP, etc
|
Name: |
Concrete Lifting Undercut Eye Anchor
|
| Grade: |
4.8, 6.8, 8.8, 10.9, 12.9
|
Assembly: |
Hex bolt/eye bolt/hook bolt, nut, and washer
|
Usage: |
Concrete, masonry, brick, etc
|
| Package: |
Bag, carton, then on pallet, or as per requirement
|
###
| Packaging Detail: | 25KG/CTN,36CTNS/PLT, or according to customers’ requirement |
| Delivery Detail: | Within 15-30 days after confirming the deposit |
###
| Name | Concrete Lifting Undercut Eye Anchor |
| Place of Origin | Qingdao,Shandong, China |
| Size | M6-M16 or non-standard as request&design |
| Length | 50mm-150mm or non-standard as request&design |
| Grade | 4.8, 6.8, 8.8, 10.9, 12.9 |
| Standards | GB, DIN, ISO, ANSI/ASTM, B7, BS, JIS etc |
| Material | Steel |
| Finish | Zinc plated, YZP, etc |
| Delivery | Within 15-30 days after confirming the deposit |
| Package | 25KG/CTN,36CTNS/PLT, or according to customers’ requirement |
| Payment | L/C or T/T (30% in advance and 70% against the copy of BL) |
| Non-standards | OEM is available if you provide a drawing or sample. |
| Samples | Samples are free. |
| Usage | Gypsum board and other hollow wall |
| Website |
atindustry.en.made-in-china.com |
| Place of Origin: |
Shandong China (Mainland)
|
Brand Name: |
AT
|
Model Number: |
GT-ANCHOR
|
| Type: |
Expansion Anchor
|
Material: |
Steel
|
Diameter: |
M6-M16
|
| Length: |
50mm-150mm
|
Capacity: |
1.4KN-4.0KN
|
Standard: |
GB,GB, DIN, ISO, ANSI/ASTM, B7, BS, JIS etc
|
| Size: |
M6-M16
|
Finish: |
Zinc plated, YZP, etc
|
Name: |
Concrete Lifting Undercut Eye Anchor
|
| Grade: |
4.8, 6.8, 8.8, 10.9, 12.9
|
Assembly: |
Hex bolt/eye bolt/hook bolt, nut, and washer
|
Usage: |
Concrete, masonry, brick, etc
|
| Package: |
Bag, carton, then on pallet, or as per requirement
|
###
| Packaging Detail: | 25KG/CTN,36CTNS/PLT, or according to customers’ requirement |
| Delivery Detail: | Within 15-30 days after confirming the deposit |
###
| Name | Concrete Lifting Undercut Eye Anchor |
| Place of Origin | Qingdao,Shandong, China |
| Size | M6-M16 or non-standard as request&design |
| Length | 50mm-150mm or non-standard as request&design |
| Grade | 4.8, 6.8, 8.8, 10.9, 12.9 |
| Standards | GB, DIN, ISO, ANSI/ASTM, B7, BS, JIS etc |
| Material | Steel |
| Finish | Zinc plated, YZP, etc |
| Delivery | Within 15-30 days after confirming the deposit |
| Package | 25KG/CTN,36CTNS/PLT, or according to customers’ requirement |
| Payment | L/C or T/T (30% in advance and 70% against the copy of BL) |
| Non-standards | OEM is available if you provide a drawing or sample. |
| Samples | Samples are free. |
| Usage | Gypsum board and other hollow wall |
| Website |
atindustry.en.made-in-china.com |
Screw Shaft Features Explained
When choosing the screw shaft for your application, you should consider the features of the screws: threads, lead, pitch, helix angle, and more. You may be wondering what these features mean and how they affect the screw’s performance. This article explains the differences between these factors. The following are the features that affect the performance of screws and their properties. You can use these to make an informed decision and purchase the right screw. You can learn more about these features by reading the following articles.
Threads
The major diameter of a screw thread is the larger of the two extreme diameters. The major diameter of a screw is also known as the outside diameter. This dimension can’t be directly measured, but can be determined by measuring the distance between adjacent sides of the thread. In addition, the mean area of a screw thread is known as the pitch. The diameter of the thread and pitch line are directly proportional to the overall size of the screw.
The threads are classified by the diameter and pitch. The major diameter of a screw shaft has the largest number of threads; the smaller diameter is called the minor diameter. The thread angle, also known as the helix angle, is measured perpendicular to the axis of the screw. The major diameter is the largest part of the screw; the minor diameter is the lower end of the screw. The thread angle is the half distance between the major and minor diameters. The minor diameter is the outer surface of the screw, while the top surface corresponds to the major diameter.
The pitch is measured at the crest of a thread. In other words, a 16-pitch thread has a diameter of one sixteenth of the screw shaft’s diameter. The actual diameter is 0.03125 inches. Moreover, a large number of manufacturers use this measurement to determine the thread pitch. The pitch diameter is a critical factor in successful mating of male and female threads. So, when determining the pitch diameter, you need to check the thread pitch plate of a screw.
Lead
In screw shaft applications, a solid, corrosion-resistant material is an important requirement. Lead screws are a robust choice, which ensure shaft direction accuracy. This material is widely used in lathes and measuring instruments. They have black oxide coatings and are suited for environments where rusting is not acceptable. These screws are also relatively inexpensive. Here are some advantages of lead screws. They are highly durable, cost-effective, and offer high reliability.
A lead screw system may have multiple starts, or threads that run parallel to each other. The lead is the distance the nut travels along the shaft during a single revolution. The smaller the lead, the tighter the thread. The lead can also be expressed as the pitch, which is the distance between adjacent thread crests or troughs. A lead screw has a smaller pitch than a nut, and the smaller the lead, the greater its linear speed.
When choosing lead screws, the critical speed is the maximum number of revolutions per minute. This is determined by the minor diameter of the shaft and its length. The critical speed should never be exceeded or the lead will become distorted or cracked. The recommended operational speed is around eighty percent of the evaluated critical speed. Moreover, the lead screw must be properly aligned to avoid excessive vibrations. In addition, the screw pitch must be within the design tolerance of the shaft.
Pitch
The pitch of a screw shaft can be viewed as the distance between the crest of a thread and the surface where the threads meet. In mathematics, the pitch is equivalent to the length of one wavelength. The pitch of a screw shaft also relates to the diameter of the threads. In the following, the pitch of a screw is explained. It is important to note that the pitch of a screw is not a metric measurement. In the following, we will define the two terms and discuss how they relate to one another.
A screw’s pitch is not the same in all countries. The United Kingdom, Canada, and the United States have standardized screw threads according to the UN system. Therefore, there is a need to specify the pitch of a screw shaft when a screw is being manufactured. The standardization of pitch and diameter has also reduced the cost of screw manufacturing. Nevertheless, screw threads are still expensive. The United Kingdom, Canada, and the United States have introduced a system for the calculation of screw pitch.
The pitch of a lead screw is the same as that of a lead screw. The diameter is 0.25 inches and the circumference is 0.79 inches. When calculating the mechanical advantage of a screw, divide the diameter by its pitch. The larger the pitch, the more threads the screw has, increasing its critical speed and stiffness. The pitch of a screw shaft is also proportional to the number of starts in the shaft.
Helix angle
The helix angle of a screw shaft is the angle formed between the circumference of the cylinder and its helix. Both of these angles must be equal to 90 degrees. The larger the lead angle, the smaller the helix angle. Some reference materials refer to angle B as the helix angle. However, the actual angle is derived from calculating the screw geometry. Read on for more information. Listed below are some of the differences between helix angles and lead angles.
High helix screws have a long lead. This length reduces the number of effective turns of the screw. Because of this, fine pitch screws are usually used for small movements. A typical example is a 16-mm x 5-inch screw. Another example of a fine pitch screw is a 12x2mm screw. It is used for small moves. This type of screw has a lower lead angle than a high-helix screw.
A screw’s helix angle refers to the relative angle of the flight of the helix to the plane of the screw axis. While screw helix angles are not often altered from the standard square pitch, they can have an effect on processing. Changing the helix angle is more common in two-stage screws, special mixing screws, and metering screws. When a screw is designed for this function, it should be able to handle the materials it is made of.
Size
The diameter of a screw is its diameter, measured from the head to the shaft. Screw diameters are standardized by the American Society of Mechanical Engineers. The diameters of screws range from 3/50 inches to sixteen inches, and more recently, fractions of an inch have been added. However, shaft diameters may vary depending on the job, so it is important to know the right size for the job. The size chart below shows the common sizes for screws.
Screws are generally referred to by their gauge, which is the major diameter. Screws with a major diameter less than a quarter of an inch are usually labeled as #0 to #14 and larger screws are labeled as sizes in fractions of an inch. There are also decimal equivalents of each screw size. These measurements will help you choose the correct size for your project. The screws with the smaller diameters were not tested.
In the previous section, we described the different shaft sizes and their specifications. These screw sizes are usually indicated by fractions of an inch, followed by a number of threads per inch. For example, a ten-inch screw has a shaft size of 2” with a thread pitch of 1/4″, and it has a diameter of two inches. This screw is welded to a two-inch Sch. 40 pipe. Alternatively, it can be welded to a 9-inch O.A.L. pipe.
Shape
Screws come in a wide variety of sizes and shapes, from the size of a quarter to the diameter of a U.S. quarter. Screws’ main function is to hold objects together and to translate torque into linear force. The shape of a screw shaft, if it is round, is the primary characteristic used to define its use. The following chart shows how the screw shaft differs from a quarter:
The shape of a screw shaft is determined by two features: its major diameter, or distance from the outer edge of the thread on one side to the inner smooth surface of the shaft. These are generally two to sixteen millimeters in diameter. Screw shafts can have either a fully threaded shank or a half-threaded shank, with the latter providing better stability. Regardless of whether the screw shaft is round or domed, it is important to understand the different characteristics of a screw before attempting to install it into a project.
The screw shaft’s diameter is also important to its application. The ball circle diameter refers to the distance between the center of two opposite balls in contact with the grooves. The root diameter, on the other hand, refers to the distance between the bottommost grooves of the screw shaft. These are the two main measurements that define the screw’s overall size. Pitch and nominal diameter are important measurements for a screw’s performance in a particular application.
Lubrication
In most cases, lubrication of a screw shaft is accomplished with grease. Grease is made up of mineral or synthetic oil, thickening agent, and additives. The thickening agent can be a variety of different substances, including lithium, bentonite, aluminum, and barium complexes. A common classification for lubricating grease is NLGI Grade. While this may not be necessary when specifying the type of grease to use for a particular application, it is a useful qualitative measure.
When selecting a lubricant for a screw shaft, the operating temperature and the speed of the shaft determine the type of oil to use. Too much oil can result in heat buildup, while too little can lead to excessive wear and friction. The proper lubrication of a screw shaft directly affects the temperature rise of a ball screw, and the life of the assembly. To ensure the proper lubrication, follow the guidelines below.
Ideally, a low lubrication level is appropriate for medium-sized feed stuff factories. High lubrication level is appropriate for larger feed stuff factories. However, in low-speed applications, the lubrication level should be sufficiently high to ensure that the screws run freely. This is the only way to reduce friction and ensure the longest life possible. Lubrication of screw shafts is an important consideration for any screw.
