Our tuner lug bolts is 10.9 grade with heat treatment, material is alloy steel, diameter is 19mm, it fit wheels with small diameter recesses, we have many shank length, such as 23mm, 28mm, 30mm
Avoid bolt breakage
Hardness control: we will do different hardness according to grade request, also choose different materials according to the hardness request, don't use inferior materials when you want high hardness bolts.
We must get rid of stress before plating, and cancel hydrogen after plating. During bolt's electroplating process, due to the dissociation of water molecules, a part of hydrogen ions will be produced, so the cathode precipitates metal and hydrogen at same time in the electroplating process. Precipitates hydrogen is easy to lead the bolt hydrogen embrittlement, it will bring the hidden danger is bolt fracture, which is very serious safety problem.
Each bolt with HONISHEN brand has been specially treated. not only ensure the hardness but also keep flexibility of the corresponding grade:
Get rod of stress before plating: we will do a temper treatment after bolt was handled by heat treatment, even some high requirement product, it need to extremely cold treatment, the temperature is -100oC ~ -300oC, heat preservation time is 24-36 hours. Through the conversion of extreme heat and extreme cold, reduce the hidden danger of bolt hydrogen penetration.
Cancel hydrogen after plating: Hydrogen removal is done by heating and baking within 1-2 hours after plating. The temperature is 150oC ~ -300oC and the insulation time is 3-24 hours. We will choose different insulation time according to the size of the product itself.