Release time：2020-01-16 18:44 Browse：
### 1. **Specialty Bolts** - **Purpose**: Engineered for niche or high-demand applications (e.g., aerospace, heavy machinery, or custom industrial setups) where standard bolts fail to meet specific requirements—such as extreme temperatures, high vibration, or unique dimensional constraints. - **Features**: May include non-standard materials (e.g., alloy steel, titanium), specialized coatings (e.g., anti-seize, high-temperature resistant), or custom head/thread designs (e.g., socket heads, square drives) to align with project-specific needs. ### 2. **Extended Screws** - **Design**: Longer shank length than standard screws, with lengths often exceeding typical industry norms (e.g., 150mm+). The extended body allows fastening through thick workpieces, deep fixtures, or multi-layered materials (e.g., metal plates, wooden beams, or composite structures). - **Use Cases**: Critical in construction (securing deep brackets), automotive repair (fastening large components), or manufacturing (attaching machinery to thick bases) where standard-length screws lack sufficient reach. ### 3. **Hexagonal Flange Bolts** - **Structure**: Combine a hexagonal head (for easy torque application with wrenches/sockets) and an integrated circular flange (a widened, flat rim at the base of the head). - **Advantages**: The flange distributes clamping force evenly across the workpiece surface, reducing pressure and preventing damage to soft materials (e.g., plastic, wood). Eliminates the need for separate washers, streamlining assembly and reducing part counts. ### 4. **Semi-Threaded Screws** - **Thread Pattern**: Feature partial threading—typically a threaded section near the tip (for gripping nuts or tapped holes) and a smooth, unthreaded shank closer to the head. - **Benefits**: The smooth shank allows flexibility during installation, adapting to minor misalignments or varying material thicknesses. Balances grip strength (from threads) with ease of adjustment, making them ideal for applications like furniture assembly or temporary fixtures. ### 5. **Full-Threaded Screws** - **Thread Pattern**: Fully threaded from the base of the head to the tip, ensuring maximum engagement with nuts, tapped holes, or threaded inserts along the entire length. - **Strength**: Provides uniform clamping force across the entire shank, making them suitable for high-tension applications (e.g., structural bracing, load-bearing brackets) where consistent grip and resistance to loosening are critical. ### 6. **Galvanized Screws** - **Surface Treatment**: Coated with a layer of zinc (via electroplating or hot-dip galvanizing) to form a protective barrier against moisture, oxidation, and rust. - **Variations**: Zinc plating thickness ranges from 5-25μm; may include a chromate passivation layer for enhanced corrosion resistance. Suitable for indoor, dry, or moderately humid environments (e.g., home construction, industrial shelving) but less ideal for extreme saltwater or acidic settings. - **Appearance**: Typically silver-gray or dull gray, with a matte or slightly shiny finish depending on the plating process.
