Release time：2020-01-16 18:44 Browse：
1. Non-standard Sizes and Specifications
Extra-long screws do not follow unified standard specifications like common screws. Their lengths, thread types, and head styles (such as hex socket, hex head, pan head, etc.) often vary according to customer requirements. Therefore, stocking standard inventory is not practical.
2. Special Applications and Dispersed Demand
Extra-long screws are mainly used in specific applications such as deep-hole fixing, heavy equipment assembly, or structural fastening. Different industries and applications require different strength grades, materials (like Grade 8.8, 10.9, 12.9), and surface treatments (such as zinc plating or Dacromet), making mass production for stock inefficient.
3. Long Production Time and High Inventory Cost
Due to their extended length, extra-long screws often exceed the forming capacity of standard cold heading machines. They typically require secondary processing with mold-closing machines or CNC lathes, which is time-consuming and costly. Holding inventory would tie up capital and risk stock obsolescence, so they are usually made to order.
4. Diverse Customization Requirements
Many customers have specific customization needs such as:
Special materials like 40Cr, SCM435, or 304 stainless steel
Requirements for rubber coating, waterproof washers, or thread-locking patches
Strict demands on verticality or dimensional tolerances
These are all non-standard specifications, which can only be fulfilled through custom production based on drawings or detailed requirements.
