What Are The Characteristics Of Square Bolts

Posted by abyihui on March 23rd, 2020

Connecting structural members.  Large angle steel and small angle steel are specially processed by DIN 603 bolts and then tightened with nuts.  Milling a keyway on one side of the bolt, firstly fixing it, then hammering it into the slot on one side of the bolt.  The dimension design of the square key and the key slot shall ensure that the end of the square key and the end of the bolt are just flat after the square key is inserted into the key slot to prevent loosening and theft.
The DIN 603 bolt is characterized in that the size of the keyway must be strictly specified.  If the keyway is small, the nut cannot be prevented from loosening.  However, if the keyway is large, the effective area of the bolt cross section will be greatly weakened, thus affecting the strength of the bolt.  In design, in order to ensure reliable connection, the number of bolts should be appropriately increased.

Another characteristic of the square bolt is that after the square key is wedged into the key slot, the local internal thread of the nut is firstly damaged, and then the key rises outward along the arc-shaped part of the key slot, and the bolt hole wall on the connecting angle steel plays a role of preventing retreat.  Role.  The third characteristic of the square bolt is that when the nut is loosened, the friction force acts.
The key will roll, and then the diagonal of the cross section of the square key will be used as the arm to generate enough anti-reverse torque to increase the anti-reverse effect.  FDL-2 type Square Bolt connection is an inseparable connection.

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abyihui
Joined: June 11th, 2019
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