How to distinguish between socket head cap bolts and outer hex head cap bolts ?

How to distinguish between socket head cap Bolts and outer hex head cap bolts ?

Everyone must be familiar with hexagon bolts. Hexagon bolts refer to fasteners consisting of a head and a screw rod. The bolts are divided into iron bolts and stainless steel bolts according to their materials, namely Hexagon Head Bolts (partial threads) - C grade and hexagon head bolts. (Full Thread) - Grade C. So how to distinguish between hexagon socket bolts and external hexagon bolts, when to choose socket head bolts, and when to choose external hexagon bolts? Today I will explain to you.

Although the outer hexagon screw and the inner hexagon screw are both types of fasteners, we need to understand that the screw head of the inner hexagon screw is round on the outside, and the middle is a recessed hexagon, and the hexagon screw is a common screw head. The kind with hexagonal sides. The hexagon socket screwdriver looks like a "7". Cut the two ends of the hexagonal steel bar and bend it to 90 degrees to become a hexagon socket screw wrench. Hexagon Screws with hexagonal sides. The biggest difference between the two is:

1. The inner hexagon bolt takes up much less space. The inner hexagon can be installed in a deeper position during installation, and the outer hexagon installation (including tightening) requires a large space.

2. The general inner hexagon has higher hardness than the general outer hexagon bolt.

3. The head of the hexagon socket head bolt can be sunk into the part without being exposed, reducing the overall size, beautiful appearance, and not hindering other parts

4. Hexagon socket head bolts are suitable for places where they are frequently disassembled (the head is harder than the outer hexagon head), or where space is limited. It is very important to install the bolts. The outer hexagon should be rotated radially, and the inner hexagon can be rotated axially, depending on the activity space. There are also hexagon sockets that can be countersunk, not exposed. The contact area of the inner hexagon is smaller than that of the outer hexagon. We use more hexagon sockets on our mechanical seals to save space.