Wrench or Socket and Bolt Size Comparison Chart

What types of bolts are used in steel structure buildings?

There are many types of bolts used in steel structure buildings, and common ones include the following:

1. Ordinary Bolts: usually made of carbon steel and used to connect steel parts in structures. According to the different head shapes and connection methods, ordinary bolts can be divided into hexagonal head bolts, round head bolts, countersunk head bolts, etc.

2. High-Strength Bolts: have higher tensile strength and shear strength, and are usually used to connect large structures or parts that need to bear larger loads. Common high-strength bolt standards include grade 8.8, grade 10.9, grade 12.9, etc.

3. Stud Bolts: One end is a hexagonal head and the other end is a flat head. They are often used in connection parts that need to be frequently disassembled to facilitate installation and disassembly.

4. Studs: Similar to bolts, but longer in length, they are usually used to connect thicker steel structural members or joints that require frequent adjustments.

5. Anchor Bolts: used to connect steel structures to concrete foundations or walls, often used for foundation fixation of buildings.

6. Self-Tapping Screws: used to connect light steel keels, thin plate materials or other specific parts. They have self-tapping cone heads to facilitate direct penetration of materials and fixation.

7. Fasteners: including nuts, washers, etc., used in conjunction with bolts to increase the stability and sealing of the connection.

The selection of these bolts and fasteners depends on factors such as the specific design requirements of the steel structure, loading conditions, connection methods, and environmental conditions.

What wrench is used for different bolts?

Different types of bolts usually require the use of corresponding types of wrenches for installation and removal. Here are the common bolt types and their corresponding wrenches:

1. Hex Head Bolts: Typically a hex wrench (also called a hex wrench or torque wrench) is used to tighten and loosen. Hexagonal head bolts have heads of different sizes, and you need to choose a hexagonal wrench that matches the bolt head.

2. Round Head Bolts: Generally, a wrench is used for a rotating operation to tighten or loosen the connection.

3. Countersunk Head Bolts: Usually a countersunk head wrench is used for installation and removal. The characteristic of countersunk head bolts is that the head is sunk so that it is flush with the surface of the connected parts. The countersunk head wrench can be easily operated and ensure a secure connection.

4. High-Strength Bolts: For high-strength bolts, a high-torque wrench or air wrench may be required to ensure correct tightening force. These wrenches typically have higher torque output and are suitable for tightening large and high-strength bolts.

5. Self-Tapping Screws: Usually installed using an electric screwdriver or screwdriver. An electric screwdriver can quickly and effectively secure self-tapping screws into materials.

6. Anchors: Installing anchors typically requires the use of a pneumatic or hammer drill bit to secure the anchor into concrete or other base material.

When choosing a wrench, make sure it is the right size and type for the bolt to ensure smooth installation and removal and to avoid damaging the bolt or connecting parts.

Wrench and Bolt Size Comparison Chart

Comparison table of the opposite side of metric External hexagon bolts and socket (Torx) wrenches:

Comparison table of metric hexagon socket bolts and torx wrenches:

External hexagon bolt and open-end wrench size comparison table

The open-end wrench used for the external hexagon corresponds to the hexagonal nut, which is a more accurate reference. Because there are hex head bolts and small hex head bolts.
Commonly used open-end wrench specifications are:

NO.	Bolt Specifications	Open-End Wrench Size
1	M4	7mm
2	M5	8mm
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