Product Description
Products Details
Drywall screws have become the standard fastener for securing full or partial sheets of drywall to wall studs or ceiling joists. Drywall screws’ lengths and gauges, thread types, heads,points, and composition at first might seem incomprehensible. But within the area of do-it-yourself home improvement, this vast range of choices narrows down to just a few well-defined picks that work within the limited types of uses encountered by most homeowners. Even having a good handle on just the 3 main features of drywall screws will help: drywall screw length, gauge,and thread.
For most work involving 1/2-inch drywall on installed on wood studs, the phosphate coated, coarse thread 1 1/4-inch or 1 5/8-inch drywall screw does a reliable job. This screw is inexpensive and can be purchased in large tubs, since drywall work requires a multitude of fasteners. The 1 5/8-inch drywall screw can be difficult to sink, since so much shaft remains after the first 1/2-inch of the drywall thickness is covered. Stepping back on length means easier driving but it also does mean reducing holding strength. Since the last 1/8-inch of sink is critical (where the bugle head of the screw needs to crease but not tear the outer paper layer), this shorter screw makes it easier to calibrate that last 1/8-inch of drive.
| Product Name | black screw , drywall screw , gypsum screw |
| Material | carbon steel 1571A |
| Color | black phosphated ,grey phosphated ,blue-white zinc , white zinc , yellow zinc |
| Surface finish | wax, zinc plated, trivalent chromium blue white zinc, brass plated, phosphate, mechanical zinc, hot-dip galvanized, dacromet |
| Thread Code | full thread and half thread |
| Standard | ISO,GB,DIN,JIS,ANSI,BSW |
| Diameter | M3.5-M4.8, 6#-10# |
| Length | 10mm-254mm |
Porducts images
Package Details
5KG/box, 4 boxes/carton
1KG/box, 20 boxes/carton
1KG/box, 25 boxes/carton
Company Profile
ZheJiang Boya Metal Products Co.Ltd specialized in maufacturing all kinds of nails,black annealed wire ,electrical galvanzied wire ,hot dipped galvanzied wure and wire mesh products used in construction and decoration .We have the advanced wire -drawing ,galvanzing and wire mesh weaving equipment.We have 31 sets for producing nail ,one production line for black annealed wire .one line for electricial galvanized wire and 1 line for producing the hot dipped galvanized wire ,We also supply fence post ,and wire mesh to meet our customer’s requirment with lower price and better quality .Our factory covers an area of 20 acres .15 dollors,employee 70 perdon ,include excellent sales 8person .Advanced production equipment and processing technical ,the annual production capacity reach about 50000 tons .
ZheJiang Boya Metal Products Co.Ltd .which established in 1998,We have our own wure and nails mills with independent export and import rights .Our factory ocated in Xihu (West Lake) Dis. ZheJiang ,is near Xihu (West Lake) Dis.g port and ZheJiang airport.The advantageous location has ensured punctual delivery time and saved cost .
Our products just for esporting ,and can meet the different requiremants from domestic and overseas market .We have already exported to West Africa ,East Africa,Middle East ,South America,Southeast Asia etc.So far ,we have established the long-term business relationship with Europe clients ,And the quality of our products have been appreciated by all clients .We are willing to cooperate with you in near future!
Our company priciples arefine quality ,in -time consignmnet and reasonable price .We sincerely hope to establish business relationships with friends from around the world and create a bright future together with your firm .
Exhibition
FAQ
Q1: Are you a trading company or a manufacturer?
A: we are manufacturer.
Q2: Where is your factory located? How can I visit there?
A: Our factory is located in Xihu (West Lake) Dis. district, HangZhou city ,ZheJiang province ,China. All our clients and friends, from home or abroad, are warmly welcome to visit us.
Q3:What are your main products? A:Our products mainly include all kinds of bolts, nuts, washers, anchor bolts and threaded rods with GB, DIN, ANSI standards and many special specifications and so on.
Q4:Can I get some samples?
A: Yes, you can get our free samples.Our samples are only free for the customers who confirmed the order. But the freight for express is on customers.
Q5: What should we do if goods are received with some quality problems?
A: All goods have been inspected during the assembling and packing process, the posssibility to get defects is very small. If there are indeed some quality problems, please take some photos and show to us immediately, also please show us other details to locate the problem sources. After we verified the problem, customers can choose to be either refunded or request us to resend another batch of goods without problems.
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.
