The pan head screw is used in the manufacture of various types of furniture, in the construction industry, in the automotive industry. This is a reliable way to fasten a wide variety of parts made of wood, metal, plastic.
Types of screws, their classification
A screw is a hardware product that looks like a threaded rod and a head of various shapes. Threading is practiced along the entire length of the rod or is only partially performed. The main difference between screws and bolts is that they are screwed into a part, and a nut is screwed onto the bolt. The use of additional elements in the form of nuts is not required. Most often used for non-through connections. This type of hardware is classified:
- The type of hat.
- Threaded.
- To length.
The screw head can be made semi-circular or flat. Fasteners are also made with the absence of a head. To transmit torque, a slot is made in the screw head (straight, cross-shaped, in the form of an asterisk), knurling or a slot in the end of the rod.
The thread on the rod is small and large in size. It can be cut along the entire length of the screw or only partially.
Polength distinguish between short, medium and long screws.
Depending on the purpose of the button head screw is divided into:
- Mounting hardware.
- Installation hardware.
Mounting screws are used to connect parts with the possibility of further disassembly of fasteners. Set screws are used to fix parts.
There are two accuracy classes of manufactured fasteners: A, B. The manufacture and dimensions of hardware are standardized according to GOST 17473-80.
Such products are made of carbon steel with anti-corrosion coating or not galvanized. The most widespread are electro-galvanized hardware with strength class 4, 6. A screw with a semicircular head is used in hard-to-reach fastening points.
Self-tapping pan head screws
These hardware products are produced with Ph type cross slot or Torx slot. They are used for cutting a metric thread in the hole of one of the connected parts. Used to fasten plastic, metal or wood joints.
According to the thread diameter, self-tapping screws vary from M3 to M8. Large thread pitch - from 0.5 mm to 1.25 mm. The minimum screw length can be from 6mm for size M3 to 16mm for size M8.
Furniture screws
Furniture screw with a semicircular head can be equipped with a press washer at the request of the customer, has a cross slot on the head. Press washer orthe collar is a single element with the head. The result is an increased support surface area at the point of fixing, which significantly reduces the pressure on the material of the product and does not deform it. At the same time, the fastening is more durable. It is mainly used as a fastener for furniture fittings. The thread is partially cut on the rod.
Cross-shaped slots on the head come in a standard shape (Ph) and an improved shape (Pz).
Furniture screws vary in thread diameter from M3 to M8. The cap diameter can be from 7.5 mm for size M3 to 19 mm for size M8.
The length of the screw can vary from 6-120mm.
Hex socket cap screw
Hardware with a semicircular head and an internal hexagon is used in assembly work to fasten various elements and components of systems. Large sizes of hardware are used in construction and installation works. The internal hexagon in the body of the screw head is essentially a spline.
Screws are also available with a low round head and a hexagon key. They are used for screeding furniture elements together with Ericsson nuts or Barrel nuts.
One of the varieties is an anti-vandal secret screw with a semicircular head, a hexagon for a key and a pin in the head for a special bit. Used as protection against unauthorized access to the junction,dismantling or damage to the fixed equipment. Made from A2 stainless steel. As an option, it is also possible to produce hardware with an asterisk on a turnkey basis.
There are also screws with a semi-circular enlarged low head with a cross or slot, captive screws. The applications for pan head screws are very diverse. This is a type of hardware widely used for various fasteners of products.
