Screws are common industrial necessities in daily life, hexagonal screws because of its simple, convenient and good operation advantages, the frequency of use is relatively high. But hexagon screws also have inner hexagon and outer hexagon, what are their advantages and disadvantages?
Hexagon socket screw is often used in machinery, mainly has the advantages of easy fastening, disassembly, not easy to slip Angle. The manufacturing cost of hexagon screws is lower than the hexagon socket screws, another dynamic strength is small, low accuracy requirements of the machine using hexagon socket screw is less than the hexagon screws. The advantage of hexagon socket is the space is smaller, can make in countersunk head, pan head,button head and so on. Generally willbe used in small equipment, the disadvantage is that the preload contact area is small can not be used too large preload, the price is more expensive.
Outer hexagon screws are generally fine tooth common thread, round tooth common thread outer hexagon screw self-pin is good, mainly used for thin-walled parts or impact, vibration or alternating load occasions. Hexagon socket screws with hole are used when locking with hexagon socket screws is required. External hexagon screw with hinged hole can fix the position of connected parts accurately. And can be subjected to shear and extrusion produced by the die force. The advantage of the outer hexagon is that the preload contact area is large, can use a lot of preload, generally used in large equipment, the price is low than the inner hexagon, the disadvantage is that the space is large, can not be used in the sink.
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