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The main difference between the hex bolt and the outer hex bolt is the design of the head:

1. Hex bolt: The head of the hex bolt is designed as a hexagonal groove, which needs to be tightened or loosened by using a hex wrench or hex screwdriver. The advantage of this design is that the tool can be better embedded in the bolt head, providing good torque and reducing the possibility of slippage. Moreover, because the bolt head is flat and not prominent, hexagonal bolts are a good choice in situations where space is limited or aesthetics are needed.

2. Outer hexagonal bolt: The head of the outer hexagonal bolt is designed as a hexagonal convex body, which needs to be tightened or loosened by using an outer hexagonal wrench or socket wrench. The advantage of this design is that it is easier to operate, and the torque is large, and it is suitable for connection structures that need to withstand greater forces. The application of outer hexagonal bolts is very wide, and its figure can be seen in almost all places where bolts are needed.

In general, hexagon bolts and outer hexagon bolts have their own advantages and application occasions, and it is necessary to choose which one to use according to actual needs.

When choosing a hex bolt or an outer hex bolt, the following factors also need to be considered:

1. Material and strength: The material of the bolt directly affects its strength and corrosion resistance. For example, stainless steel bolts are suitable for use in wet or corrosive environments, while high-strength steel bolts are suitable for use in situations where they need to withstand high pressure or temperature.

2. Process requirements: In some precision equipment or high-end products, hex bolts may be required to be used, because the head is flat, the appearance is more beautiful, and the overall size of the equipment can be reduced.

3. Use environment: In places where space is small or need to be disassembled frequently, hex bolts are more convenient due to their compact design. In places where space is abundant and greater torque is required, outer hex bolts are more practical.

4. Tool matching: the internal and external hex bolts need to be matched with different wrenches or screwdrivers, and the matching problem of tools needs to be considered when using.

5. Cost factor: Generally speaking, the manufacturing cost of hexagon bolts is slightly higher than that of outer hexagon bolts, which is also a factor to be considered when choosing.

In general, hexagon bolts and outer hexagon bolts have their own advantages and characteristics, and the choice of which one to use needs to be determined according to the specific application environment and needs.