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One Kind Of Implosion Expansion Bolt On July 27, 2019, we received a project from a Saudi client. The client wants an expansion bolt , but unlike previous expansion bolts , it is suitable for some cavity type structures that can only be tightened from one sid e. The bolt required by the customer is M16x50mm , grade 10.9 , surface hot dip galvanized.Due to the requirement of working condition and strength grade.We recommend using 35CrMo material. The implosion expansion bolt consists of an outer hexagon bolt, a sleeve, and a conical nut. To use, insert the bolt of the sleeve into the hole that needs to be tightened, use the hexagon wrench to clamp the hexagon on the main sleeve, and use the outer hexagon wrench to clamp the hexagon on the bolt, and tighten it. The conical nut will go up with the rotation to open the slot under the sleeve, and the tightening effect has been achieved. Picture of implosion expansion bolt: C hemical C omponent  of 35CrMo: ...

About the Introduction of Q235 Bolts 1 Introduction: Q235 steel is a carbon structural steel. It is equivalent to A3 and C3 steel in the old standard GB700-79 grade, and it is the grade of Russian TOCT. The Q in the steel number represents the yield strength. Usually, the steel is used directly without heat treatment. Composition(%) C Mn Si S P Q235A 0.14-0.22 0.30-0.65 ≤0.30 ≤0.050 ≤0.045 Q235B 0.12-0.20 0.30-0.70 ≤0.30 ≤0.045 ≤0.045 Q235C ≤0.18 0.35-0.80 ≤0.30 ≤0.040 ≤0.040 Q235D ≤0.17 0.35-0.80 ≤0.30 ≤0.035 ≤0.035 At present, the standard parts on the market mainly include carbon steel, stainless steel and copper . Bolt: Mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (a cylinder with an external thread) is required to be fitted with a nut for fastening the two parts with through holes. This type of connection is called a bolted connection. If...