A pan head screw is used in the manufacture of various types of furniture, in the construction industry, and in the automotive industry. This is a reliable way to mount a wide variety of parts made of wood, metal, plastic.
Types of screws, their classification
A screw is a hardware product having the form of a rod with a thread and a head of various shapes. Thread cutting is practiced along the entire length of the shaft or is only partially performed. The main difference between screws and bolts is that they are screwed into the part, and a nut is screwed onto the bolt. No additional elements in the form of nuts are required. Used most often for non-through compounds. This type of hardware is classified:
- By type of hat.
- By thread.
- By lenght.
The screw head can be made in a semicircular or flat shape. Fasteners are also made with no head. To transmit torque in the screw head, a slot is made (straight, crosswise, in the form of an asterisk), knurling or a slot in the end of the rod.
The thread on the shaft is small and large in size. It can be cut along the entire length of the screw or only partially.
The length distinguishes between short, medium and long screws.
Depending on the purpose, the pan head screw is divided into:
- Fixing hardware.
- Installation hardware.
Fixing screws are used to connect parts with the possibility of further analysis of the 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 by GOST 17473-80.
Such products are made of carbon steel with a corrosion-resistant coating or not galvanized. The most widely used electro-galvanized hardware with a strength class of 4.6. A screw with a semicircular cap is used in inaccessible places of fasteners.
Round head self-tapping screws
These hardware products are made with cross slot Ph type or slot Torx. They are used for cutting in the hole of one of the joined parts of the metric thread. Used for fastening plastic, metal or wooden joints.
According to the diameter of the thread, the screws vary from size M3 to M8. Large thread pitch - from 0.5 mm to 1.25 mm. The minimum screw length can be from 6 mm for size M3 to 16 mm for size M8.
Furniture screws
A furniture screw with a semicircular head can be equipped with a press washer at the request of the customer, has a cross-shaped slot on the head. The press washer or shoulder is a single element with the head. The result is an increased surface area at the attachment point, which significantly reduces pressure on the product material and does not deform it. At the same time, the mount is more durable. It is mainly used as a fixture of furniture fittings. The thread is partially cut on the shaft.
Crosswise slots on the head come in standard shape (Ph) and improved shape (Pz).
According to the diameter of the thread, furniture screws range from size M3 to M8. The diameter of the cap can be from 7.5 mm for size M3 to 19 mm for size M8.
The screw length can vary between 6-120 mm.
Round head screw with hexagon socket head
Hardware with a semicircular hat and internal hexagon is used during assembly work to fasten different elements and components of systems. Large sizes of hardware are used in construction works. The internal hexagon in the body of the screw head is essentially a slot.
Low-cap screws and a hex key are also available. They are used for screeding furniture elements together with Erickson nuts or Keg 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. They are used as protection against unauthorized access to the place of connection, dismantling or damage to fixed equipment. They are made of A2 stainless steel. As an option, the release of hardware with a turnkey asterisk is also possible.
There are also screws with a semicircular enlarged low hat with a crosswise or straight slot, captive screws. The applications for the pan-head screws are very diverse. This is a type of hardware that is widely used for various fasteners.