Ss Hex Nut And Hex Head Bolt

Screw is a common invention in people's production and life for thousands of years. According to the application field, it is the first invention of mankind.
The inner hexagonal screws and outer hexagonal Bolts are different in appearance, one is a cylindrical head and the other is a hexagonal head.
The hexagon socket head screw takes up less space, and the hexagon socket head screw can be countersinked during installation, and it is installed in a deep position without being exposed, reducing the overall size, beautiful in appearance, and not hindering other components. The installation and fastening of the outer hexagon requires a large space, and it rotates radially, while the inner hexagon can rotate axially, and the contact area is also larger than that of the inner hexagon screw. The inner hexagon is suitable for places where disassembly is frequent or where the space is limited, and its head is harder than the head of the outer hexagon Bolt.
Socket head cap screws
Although the strength of the thread itself is determined by the diameter, which is the same for internal and external hexagon screws, the driving torque that the head of the internal hexagon screw can withstand is much greater than that of the external hexagon bolt, because the height of the head shape of the internal hexagon is higher than that of the external hexagon. Although the thread strength of the outer hexagonal bolt is not inferior to that of the inner hexagonal screw, the head is weaker, and the outer space required by the outer hexagonal bolt is larger. It is very inconvenient to use the outer hexagonal bolt inside precision parts and complex assemblies. The appearance is also far less beautiful than the inner hexagon. Generally speaking, inner hexagons are used more on mechanical seals to save space.
In fact, the biggest and most direct cause of the difference in the use of inner hexagon bolts and outer hexagon bolts is that the cost of inner hexagon screws is far greater than that of outer hexagon bolts. Because the head shape of the outer hexagonal screw is directly formed, while the head of the inner hexagonal screw is first rounded and then cold-pressed. Due to the different head heights, the material cost is also higher for inner hexagons than for outer hexagons.

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