Advantages And Disadvantages Of Outer Hexagon Bolt And Inner Hexagon Screw

When using mechanical equipment, fasteners are necessary if you want them to work properly. However, after looking at many designs, we found that almost all fastener designs use hexagon socket screws, whether countersunk or non-countersunk. Some people may wonder why many mechanical devices use inner hex screws instead of outer hex bolts. What are the advantages of inner hex screws?

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As a leading fastener manufacturer in China, Xinchi Fastener Company has many years of experience in the fastener field. Today we are going to discuss with you the advantages and disadvantages of outer hexagon screws and inner hexagon screws.

Outer hexagon bolts

The thread on the outer hexagon bolt is generally fine tooth ordinary thread. External hexagon screws with common thread around the ring teeth have better self-pin performance, mainly used on thin-wall parts or under the impact, vibration, or alternating load.

Generally, external hexagon screws are partially threaded. Full-threaded outer hexagon screws are mainly used for short outer hexagon screws with nominal length and longer thread requirements. External hexagon screws with holes are used when external hexagon screws are needed for locking. External hexagon screws with hinged holes can accurately fix the relative position of the connected parts and can be subjected to shear and extrusion caused by die force.

The advantage of the outer hexagon blots is that the pre-loading contact area is large, and the pre-loading force can be used very much. It is generally used in large equipment, and the price is lower than the inner hexagon. The disadvantage of outer hexagon screws is that they occupy a large space and cannot be used in countersunk holes.

Hexagon socket screws

Hexagon socket screws are often used in machinery, which is easy to tighten, and disassemble, and not easy to slide Angle. An Allen wrench is usually a 90° turn, one end is long and the other is short. When using the short side of the Allen wrench to screw, we can hold the long side, which can save a lot of force and can better tighten the screw. The long end of the inner Allen wrench has a round head (hexagonal cylinder similar to the ball) or a flat head. And the round head can be very convenient for oblique disassembly, used to install some parts that are not convenient to use a wrench.

The manufacturing cost of outer hexagon screws is much lower than that of inner hexagon screws. The outer hexagon screw has the advantage that the screw head (wrench stress position) is thinner than the inner hex screws, and can not be replaced by inner hex screws in some places. In addition, machinery with low cost, small power strength, and low precision requirements use hex screws more frequently.

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The advantage of inner hexagon screws is that it occupies a small space and can be used as a countersunk head, which is generally used in small equipment. Its disadvantage is that the preload contact area is small, and can not use too large preload force. In addition, the price of hexagon screws will also be a little more expensive, after a certain length there is no full thread.

The thread on the outer hexagon screw is generally fine tooth common thread, and the ring tooth common thread outer hexagon screw has good self-selling property, which is mainly used on thin-walled parts or under impact, vibration or alternating load.

Generally speaking, the outer hexagonal screws are made into partial threads, and the full-threaded outer hexagonal screws are mainly used in occasions where the nominal length of the outer hexagonal screw is short and the longer thread is required. External hexagon screws with holes are used in situations where external hexagon screws are required to be locked. The outer hexagonal screw with hinged hole can accurately fix the phase position of the connected part. And can be sheared and extruded by the mold force.

The advantage of the outer hexagon is that the pretightening contact area is large, and a large pretightening force can be used, which is generally used in large equipment, the price is lower than the inner hexagon, but the disadvantage is that it occupies a large space and can not be used in countersunk holes.

The inner hexagonal screw is often used in machinery, which mainly has the advantages of easy fastening, disassembly, not easy to slip angle and so on. The inner hexagon wrench is usually a 90 °turn. One end is long and the other is short. When using the short side to hit the screw, the long side of the hand can save a lot of force and tighten the screw better. The long end has a split head (hexagonal cylinder similar to a sphere) and a flat head, which can be easily inclined to disassemble and install some inconvenient parts of the wrench.

The manufacturing cost of the outer hexagon is much lower than that of the inner hexagon, and its advantage is that the screw (the force position of the wrench) is thinner than the inner hexagon, and in some places it can not be replaced by the inner hexagon. In addition, the machines with low cost, low dynamic strength and low precision use much less inner hexagon screws than outer hexagons.

The advantage of the inner hexagon is that it takes up a small space and can be used as a countersunk head, which is generally used in small equipment, but the disadvantage is that the pretightening contact area is small and can not use too much pretightening force, and the price is a little more expensive. If it exceeds a certain length, there will be no full thread.

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