M12x1.25 Conical Seat Wheel Lug Bolts

When it comes to the purchase of automotive bolts, understanding the technical parameters is crucial for foreign trade buyers. The correct technical parameters not only ensure product quality, but also help buyers make more informed choices. This paper will explain some key technical parameters of M12x1.25 Conical Seat Wheel Lug Bolts and their significance in detail.

1. Bolt Diameter
The bolt diameter refers to the maximum outside diameter of the threaded portion, usually expressed in millimeters (mm). For example, M12 represents a metric bolt with a diameter of 12 mm. The choice of the appropriate diameter depends on the required bearing capacity and space constraints of the joint site. Larger diameters mean greater carrying capacity, but can also add weight and take up more space.
2. Pitch
Pitch refers to the distance between two adjacent threads, also expressed in millimeters. Standard pitch is suitable for most applications, but in some special cases, such as when higher accuracy or greater preload is required, fine teeth bolts (i.e. smaller pitch) may be a better choice. Fine teeth bolts provide better preload distribution and reduce the risk of loosening due to vibration.
3. Length
Bolt length refers to the distance from the bottom of the head to the end of the thread. Choosing the right bolt length is crucial, too long may lead to interference with other components, while too short will not provide sufficient clamping force. The ideal bolt length should be sufficient to pass through all parts to be connected and leave an appropriate amount of extension for tightening operation.
4. Strength Grade
The strength grade of the bolt reflects its ability to withstand the maximum load, usually expressed in the form of 8.8, 10.9 and so on. The larger the value, the higher the tensile strength of the bolt. For example, Class 10.9 bolts have a higher load capacity than class 8.8 and are suitable for use in suspension systems and other high-stress areas.
5. Surface Treatment
Surface treatment not only affects the aesthetics of bolts, but also plays an important role in their corrosion resistance. Common surface treatment methods include electroplating, hot dip galvanizing, phosphating and so on. Among them, electroplating treatment provides good rust protection, while hot-dip galvanizing is more suitable for outdoor use.

With an in-depth understanding of the above technical parameters, buyers can be more confident in selecting high-quality automotive bolts that suit their needs in the Junwei trading company.