Bolts

A bolt is a type of fastener typically used to join two or more parts together temporarily or permanently. Bolts consist of a threaded cylindrical shaft with a head on one end, and they are paired with a nut to secure the joint. The threaded portion of the bolt allows it to be inserted into a pre-drilled hole in one of the parts being joined, while the nut is tightened onto the exposed threads to clamp the parts together.

Bolts come in various shapes, sizes, and materials, each designed for specific applications. They can be categorized based on their head types, drive types, and the materials they're made from. Some common types of bolts include hexagon head bolts, socket head cap screws, carriage bolts, and eye bolts.

Bolts play a crucial role in construction, manufacturing, automotive, aerospace, and many other industries, where they are used to assemble structures, machinery, equipment, and vehicles. They are chosen based on factors such as the required strength, corrosion resistance, and environmental conditions of the application.

Hexagon head bolt

Head Type: Hexagonal head.
Size (Dia, Length): Available in diameters ranging from M6, M8, M10, M12, M16, M20, and M24, with lengths ranging from 20 mm to 300 mm or more, depending on the specific application and requirements.
Drive Type: Requires a wrench or socket for tightening.
Application: General-purpose fastening in construction, machinery, automotive, and structural applications.
Material: Typically made from steel, stainless steel, or brass for strength and corrosion resistance. Higher grades offer greater strength.

Hexagon head screw with captive washer

Head Type: Hexagonal head with an integrated washer.
Drive Type: Requires a wrench or socket for tightening.
Size (Dia, Length): Available in diameters ranging from M5, M6, M8, and M10, with lengths ranging from 10 mm to 50 mm, depending on the specific application and requirements.
Application: Suitable for applications with vibrations to prevent loosening over time, such as automotive, machinery, and construction.
Material: Usually steel or stainless steel for durability and corrosion resistance.

Hexagon socket head cap screw

Head Type: Socket head with a cylindrical cap.
Drive Type: Requires an Allen key or hex wrench for tightening.
Size (Dia, Length): Available in various diameters M3, M4, M5, M6, M8, M10, M12, and M16, with lengths varying from 6 mm to 100 mm or more, depending on the diameter and application requirements.
Application: Ideal for low-profile applications requiring high torque, such as machinery, automotive, and electronics assembly.
Material: Typically steel or stainless steel for strength and durability.

Hexagon socket countersunk head screw

Head Type: Socket head with a conical shape that sits flush with the surface.
Drive Type: Requires an Allen key or hex wrench for tightening.
Size (Dia, Length): Available in various thread diameters, including M3, M4, M5, M6, and M8, with lengths ranging from 6 mm to 50 mm, depending on the diameter.
Application: Provides a flush finish in woodworking, cabinetry, and metal fabrication.
Material: Commonly steel or stainless steel for strength and corrosion resistance.

Hexagon socket button head screw

Head Type: Socket head with a rounded, low-profile button head.
Drive Type: Requires an Allen key or hex wrench for tightening.
Size (Dia, Length): Available in a range of diameters including M3, M4, M5, M6, M8, M10, and M12, with lengths varying from 6 mm to 100 mm, depending on the diameter and specific requirements.
Application: Suitable for applications requiring a clean appearance and low-profile head, such as electronics and machinery assembly.
Material: Typically steel or stainless steel for strength and durability.

Wing bolt

Head Type: Bolt head with two wing-like extensions for hand tightening.
Drive Type: Hand tightened without requiring a wrench.
Size (Dia, Length): Commonly available in thread diameters such as M6, M8, M10, and M12, with lengths ranging from 20 mm to 100 mm.
Application: Used where quick installation or frequent adjustments are necessary, such as fixtures and furniture.
Material: Usually steel or stainless steel for strength and durability.

Weld bolt

Head Type: Flat or slightly rounded head designed for welding onto a surface.
Drive Type: N/A.
Size (Dia, Length): Commonly available in thread diameters ranging from M6 to M16 and lengths typically ranging from 20 mm to 150 mm.
Application: Welded directly onto surfaces or structures to provide a permanent attachment point.
Material: Typically steel or stainless steel compatible with welding processes.

Cap head square neck bolt

Head Type: Hexagonal head with a square neck portion under the head.
Drive Type: Requires a wrench or socket for tightening.
Size (Dia, Length): Commonly available in diameters ranging from M6 to M16 and lengths from 20 mm to 150 mm.
Application: Used where the bolt needs to remain in place during tightening, such as wood construction and deck railing systems.
Material: Typically steel or stainless steel for strength and corrosion resistance.

Hexagon socket head shoulder screw

Head Type: Socket head with a cylindrical shoulder portion under the head.
Drive Type: Requires an Allen key or hex wrench for tightening.
Size (Dia, Length): Available in various diameters such as M4, M5, M6, M8, and M10, with lengths ranging from 10 mm to 100 mm, depending on the diameter and specific requirements.
Application: Used as shafts or pivots in machinery and equipment where precise alignment is necessary.
Material: Usually steel or stainless steel for strength and durability.

Eye bolt

Head Type: Eye-shaped loop at one end for attaching ropes, cables, or hooks.
Drive Type: N/A.
Size (Dia, Length): Available in various diameters, typically ranging from 6 mm to 20 mm, with lengths varying from 30 mm to 150 mm.
Application: Used for lifting or securing loads in rigging systems and construction applications.
Material: Typically forged steel or stainless steel for strength and load-bearing capacity.

Foundation bolt

Head Type: Typically hexagonal or square head with a threaded portion at one end.
Drive Type: Requires a wrench or socket for tightening.
Size (Dia, Length): Available in diameters ranging from M12 to M36 and lengths from 100 mm to 600 mm, with various sizes tailored to meet different structural needs and specifications.
Application: Used to secure structures to concrete foundations, such as buildings, bridges, and machinery.
Material: Usually steel or stainless steel for strength and corrosion resistance.

SURFACE TREATMENT OF BOLTS

Hot-Dip Galvanizing: Provides superior corrosion resistance by forming a thick zinc coating through immersion in molten zinc. Commonly used in outdoor and marine applications.
Zinc Plating: Offers corrosion resistance and a bright, shiny finish. Suitable for indoor applications and provides moderate protection against corrosion.
Dacromet Coating: Provides high corrosion resistance and durability. Offers excellent performance in harsh environments and under high temperatures.
Electroplating (Nickel, Chrome): Provides corrosion resistance and decorative finishes. Nickel plating offers moderate corrosion resistance, while chrome plating offers superior corrosion resistance and a shiny finish.
Powder Coating: Provides durable and corrosion-resistant finishes available in a wide range of colors. Commonly used in automotive and outdoor applications.