Bolts are a versatile fastener, and there are many types of them. Are you unsure which kind of bolt you need when choosing bolts? Let’s learn about the common types of bolts on the market and their uses.
Different head types of bolts
Hex bolts
The outer hexagon bolt is the most commonly used fastener on the market. Its head is hexagonal in shape, and the threaded part below the head is the threaded part. There are two types: full thread and half thread. The international standard is ANSI/ASME B18.2. 1 DIN931 DIN933 DIN960 DIN961, hexagon bolts are widely used in construction, packing machines, engineering, transportation, electrical appliances, and medical fields
Flange bolts
The flange bolt is a hexagon head bolt with a flange plate added under it, which has a larger contact area than ordinary bolts and can effectively prevent the bolt from loosening and damage during use. The flange bolt standard is ANSI/ASME B18.2. 1 DIN6921. Mainly used in pipeline connection, large machinery, automobile assembly and other fields.
Carriage bolts
DIN603 ISO8678 standard carriage bolts are semi-round heads and square necks. There is also a Ribbed Neck carriage bolt. They are all used to fix the bolts by embedding connectors through the neck. They can only be fastened by installing nuts from the tail. Mainly used in machinery manufacturing, construction industry, furniture manufacturing, wheel axles and other scenarios.
Fin neck bolts
Fin neck bolts have a round head and a circle of devices shaped like fins on the neck. During installation, these fins are embedded in the contact surface to achieve locking purposes. They are mainly used in the installation of guardrails, wooden furniture, and electrical cabinets.
Plow bolts
The DIN605 standard Plow bolt is a square neck design with a flat round head and is mainly used in agricultural machinery such as tractors and snow removals.
Track bolts
Track bolts are usually designed with oval necks and round heads. The oval neck design allows them to better withstand shear and tensile forces. This design is especially important in track fixing because it can provide a more stable connection and prevent loosening due to vibration or external forces.
U bolt
U bolt is also called a bending bolt. Nuts can be installed at both ends. The U-shaped structure is often used for pipe support, automobile leaf springs and exhaust pipes, and fixed installation of cables and wires.
T bolt
T bolt also called hammer head bolt, it is named after its appearance like the letter T. It is mainly used in aluminum profile connection, industrial pipe fixation, instrument installation, solar brackets and other fields.
Square bolt
Special bolts with four-corner square head design, mainly used for heavy machinery connections.
Allen bolts
Also called the inner hexagon bolts or socket head cap screw, There is an Allen groove in the middle of the head, which needs to be installed with an Allen wrench or power tool. The head shape includes DIN912 cylindrical head, ISO7380 pan head, DIN7991 countersunk head, DIN251 flange head and other types. It is widely used in machinery manufacturing, aerospace industry, automobile manufacturing and architectural engineering fields.
Eye bolts
Eye bolt is a kind of fastener with a ring head. The threaded end can be fixed to a nut or threaded hole, and the head ring can be used to hang ropes or strips.
Hanger bolts
Hanger bolts are also called Dowel Screw . They have thread at both ends, one end has a pointed self-tapping thread and the other end has a flat machine thread. They are used to connect wood, plastic and metal. They are mainly used for the installation of solar panels and the connection of furniture.
Stud bolts
Stud bolts, also called double head bolts, have threads at both ends and can connect two objects at the same time. They are widely used in heavy machinery and
structures, such as bridges, large buildings, steel structures, petrochemical equipment, etc.
Anchor bolts
Also called dynabolt, it is a bolt specially used to fix connectors to concrete masonry. Common models are drop in anchor, wedge anchor, sleeve anchor, cut anchor, etc. The application fields include architectural engineering, mechanical installation, Bridge construction etc.
Roofing bolts
Roofing bolt is a kind of fastener specially designed to fix roofing materials. It is driven by mushroom head cross groove or flat groove. It is used together with square nuts. It is usually galvanized, which prevents the screw from rusting outdoors and improves weather resistance.
Hex lag bolts
A high-strength wood screw, thickened hexagonal head and thick screw can provide strong tensile force, mainly used for heavy-duty connections such as beams and roof structures.
J bolts
J bolt is also called hook bolt. The large J bolt can be used as an anchor bolt, and the small J bolt can be used for hoisting swings, bookshelves and flower baskets.
Toggle bolts
Toggle bolts is a folding hollow wall anchor bolt, also called umbrella expansion screw. It is mainly used to install lamps, TV stands and other accessories on ceilings, hollow walls, prefabricated panels and other materials.
Bolts with butterfly heads are also thumb screws and are often used in frequently disassembled connectors. The main application fields include machine tools, molds, drums, automobile batteries, boat accessories, etc.
Special bolts for automobile wheels, also called hub bolts, are bolts used to install automobile wheel hubs and are made of high-strength materials.
Shoulder Bolts
The diameter of the shoulder of the shoulder screw is larger than the threaded part, and this special shape provides a unique mechanical advantage to the bolt. The head is usually a hexagon head or socket head. Mainly used in automobile industry, furniture, machinery manufacturing and other fields.
Tower Step Bolt
Tower Step Bolt have a round head half thread long pole design， primarily used for steel communication and electrical transmission towers.
Its structure is similar to that of carriage bolts, its head is much thinner than it, and it is also a square neck, which is mainly used for the installation of elevators and conveyor belts.
Rivet bolts
Rivet bolts are rivet-type lock bolts. When installed, the core (mandrel) is pulled out, causing the tail of the bolt to expand, thus forming a strong mechanical lock.
It is widely used in many industries such as aviation, automobile manufacturing, construction and rail transit.
Bolts with spherical heads, usually made of stainless steel, are mainly used as 3D printer accessories.
It is shaped like the English letter V, similar to a U-shaped bolt. It has threads at both ends and can fix objects in the middle. It can fix right-angled workpieces.
Right-angle elbow structure is common in embedded concrete, and the exposed end can be used to fix steel structure or equipment, which has a remarkable anti-pull-out effect in infrastructure construction.
Special expansion bolt for hollow wall, the back sleeve is close to the inner wall after unfolding, without embedding, and is suitable for fixing light materials such as gypsum board, hollow brick and partition.
High-strength shear bolts and torsional shear fracture design ensure accurate pre-tightening force. They are used for key connections of bridges and building steel structures with high safety.
Hollow hexagon bolts, which allow liquid to flow through the screw, are often used for connections in hydraulic systems, oil pipes or brake systems.
Bolts by different materials
Mainly made of 304 stainless steel and 316 stainless steel bolts, they have bright appearance and strong corrosion resistance. They are mainly used in food machinery, medical equipment, industrial equipment, construction industry, aerospace industry and other fields.
Duplex Stainless Steel bolts
Common high-quality duplex stainless steel materials, such as S32750, S32760, S2205 and S2507, due to their excellent corrosion resistance and high strength properties, duplex stainless steel bolts are widely used in harsh corrosive environments. For example, petrochemical, marine engineering, energy fields and other industrial scenarios that require extremely high corrosion protection.
Low carbon steel bolts
The strength grades of low carbon steel bolts are 3.6, 4.8, 5.6, etc.
Because of their low cost and easy processing, low carbon steel bolts are widely used in construction, furniture, machinery and general engineering structures.
Medium carbon steel bolt
The performance grades of medium carbon steel bolts mainly include 6.8 and 8.8, which are commonly used in key parts such as machine tools, pumps and engines, automobile suspension systems and engine supports.
High carbon steel bolt
High-carbon steel bolts are made of steel with high carbon content, and are usually used in industrial machinery, building structures, automobile manufacturing and other joints that bear greater forces.
Aluminum bolt
Aluminum bolt is a kind of light fastener, which has good corrosion resistance, including semi-round head bolt, cylindrical head bolt, T-bolt and socket hexagon bolt, etc. It is mainly used to connect aluminum profiles and plates and related accessories, etc.
Titanium alloy bolt
Titanium alloy bolts are usually made of different types of titanium alloys such as TA1, TA2, TC4, GR1, etc. These materials provide different mechanical properties and corrosion resistance, and are widely used in aerospace, chemical industry, medicine and marine engineering fields.
Brass has good corrosion resistance, electrical conductivity and excellent plasticity. Its color is golden and is often used in occasions that require certain aesthetics. Brass bolts are widely used in electronics, decoration, doors and windows, water pipe devices and other fields.
Among many bolt materials, in addition to common metals, there are also a series of unknown materials, such as iron, alloy and bronze, which show unique performance advantages in specific applications; Non-metallic materials, such as plastic, nylon and glass fiber, provide diversified choices for bolts because of their lightness, corrosion resistance and insulation properties.
Summary
The above is a detailed introduction to a variety of bolts. Bolts of various materials have their advantages. Choose the appropriate bolts according to your actual needs.
So where can I buy high quality bolts? In fact, we are a fastener supplier, not only supplying all types of bolts, but also nuts, threaded rods, screws, anchors and other fasteners. In our store, you can buy all the fasteners you need in one stop. At the same time, we also provide free samples. If you are interested, please feel free to contact us and look forward to your visit.
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