Home > News & Blog

Commonly Used Bearing Head Type Classification of Bolts!

Jul. 28, 2020

Brass Ball Head Bolt factory shares this article for you.

One end of the fastener is made into a bearing surface formed by the enlarged shape. The so-called bearing surface refers to the part that supports or locates the knot, and the screw is usually loaded and unloaded through the bearing surface. There are two basic types of bearing surface, flat bearing surface (perpendicular to the connecting rod) and tapered bearing surface (forming an angle with the connecting rod). The former serves to bear the load force acting on the connecting piece in most cases. , The latter can also be used for positioning in addition to continuing the same function of the flat bearing surface. A knot with a tapered surface is usually referred to as a countersunk head. The different applications of the head type initially depend on the function of the bearing surface and the ability of the head to transmit torque.

1. Commonly used flat bearing surface bolts and different bolt head types:

Flathead: It can replace the new design of the round head and mushroom head. The head has a low diameter and a large diameter. The outer circumference of the head is connected with a high-shaped edge that indicates characteristics so that it can drive high-strength torque. There is a slight difference.

Round Head Stud Bolt

Round Head Stud Bolt

Round Head: Round Head Stud Bolt is the most commonly used head type.

Top column head: The diameter of the standard flat dome head is smaller than the round head, but it is higher due to the depth of the groove. The smaller diameter increases the pressure acting on a small area and can be tightly combined on the flange and increased surface. They can be successfully applied to the inner hole of the hole due to the heading in the drilling mold set to ensure concentration.

Dome wide-sided head: Because the under-head cut restrains and weakens the abrasion of the wire components, it is most commonly used in electrical appliances and tape recorders. It provides a more attractive medium-low head type with its sufficient bearing surface Type of design.

Big round head: also known as the elliptical top and wide side head, it is a low-shaped, cleverly designed large-diameter head. When the combined tolerance of the additional effect allows, it can be used to cover metal plate holes with larger diameters. It is also recommended to use a flat head instead.

Slotted head type: This is a creative anti-loosening head type. Once the combination is not easy to remove, it can be started with a standard screwdriver. This simple design can usually solve the cost problem in combination, increase the number of production, and create amazing economic benefits for the manufacturing process.

Hexagon socket head: A knot with a wrench head height and hexagon head size. The hexagonal shape is completely cold-formed by the reverse hole mold, and there is an obvious depression on the top of the head.

Hexagon socket washer head: As the standard hexagon socket head type, but at the same time, there is a washer surface on the base of the head to protect the completion of the assembly to avoid damage to the wrench. Sometimes the function of things is far more important than appearance.

Hexagon head: This is a standard type of torque acting on the hexagon head. It has the characteristic of trimming sharp corners to close to the tolerance range. It can be recommended for general commercial use, and can also be applied to various standard patterns and various thread diameters. Because of the necessary second process, it is more expensive than the general hexagonal socket.

Socket head: There is a deep hexagonal socket in the head of the cylinder, and CapScrew with high-strength socket head is common. The deeper bearing hole makes the high torque acting on the knot.

Twelve o'clock: Twelve outer points are placed on the high cylindrical head shape, and the washer surface bears the load applied to the knot. Because it is designed to provide a high degree of torque convenience, it is often used for high-strength knots.

Plum head: a medium-height hexagonal leaflet head with washer surface. Its design includes a straight surface perpendicular to the washer surface, and the torque bearing surface transmits torque in the circular protruding part (in the leaflet). This design utilizes the external drive system to the highest degree so that the torque can be maximized. The transmission of high torque does not change the head itself.

2. Commonly used conical bearing surface bolts and different head types of bolts

Flat-top countersunk head: The standard angle is 80-82 degrees, used for fasteners whose surfaces need to be tightly joined. The bearing surface can provide good centering.

Oval countersunk: The full name is "OvalCountersunk". This head shape is similar to the standard flat countersunk, but it is more widely used. In addition, around, the neat upper surface is more attractive in design.

Small flat-top countersunk head: Same as standard flat-top countersunk head and oblate countersunk head, the head angle is 80~82 degrees, but the head part is smaller by 1/3, which is used for simple products or particularly short length. To be more specific, it is used for standard countersunk holes and is very suitable for tight-fitting parts.

Flat-top countersunk head (100 degrees countersunk): This special flat-top countersunk screw is gradually being applied to surfaces that require close-fitting. It is recommended to use soft materials to break down the pressure on surfaces with larger and fewer angles, especially for aluminum, Soft plastic, etc.