Bolt is a cylindrical threaded fastener that passes through the work piece and is held in place by a nut or a threaded hole on the other side, The bolts are widely used in the area of  Structural Steel,Metal Building , Oil & Gas, Tower & Pole,Wind Energy,Mechanical Equipment, Automobile, Home decoration etc.
The bolts which topkun can manufacture come in many different varieties,such as Hex bolt, Hex cap screw,Hex tap bolt,Heavy Hex bolt,Heavy Hex Structural bolt,Square bolt,Tower bolt ,Step bolt ,Stud bolt/thread rod,Carriage bolt,Hex Flange bolt,T bolt,Timber bolt ,Plow bolt,U bolt etc.and bolt can be make by different materials such as carbon steel,alloy steel,stainless steel ,brass etc. and keep full rang sizes.

Topkun  Availiable Grade of bolts could be SAE J429 Gr2, 5, 8,ASTM A325,A307,A490,ASTM A193 B7 and class 4.8 6.8 8.8,10.9,12.9,The finish could be Zinc Plated,yellow zinc plated,Black oxide, H.D.G and so on.