Cylindrical Head Internal Hexagon Three-Piece Combination Galvanized Screws
Release time：2020-01-16 18:44 Browse：
Cylindrical Head: Features a cylindrical-shaped head (resembling a "cup") with height slightly greater than its diameter. This design expands the contact area with the fastened surface, evenly distributing clamping force to avoid local pressure damage and enhance connection stability.
Internal Hexagon Drive: Equipped with an internal hexagonal recess on the top of the head. It requires an Allen key (hex key) for operation, which enables higher torque transmission compared to slotted or Phillips drives. The design effectively prevents "cam-out" (slippage during high-torque tightening) and reduces wear on both the screw head and tool.
Three-Piece Pre-Assembly: Consists of three integrated components—bolt, flat washer, and spring washer (or "bolt + spring washer + flange washer" for specific models). The pre-assembled structure eliminates the need to prepare and install washers separately, significantly streamlining assembly processes, especially in batch production.
Galvanized Surface: Undergoes galvanization treatment (common methods include electro-galvanizing and hot-dip galvanizing). A dense zinc coating is formed on the surface, acting as a barrier against moisture, oxygen, and mild corrosive substances to prevent rusting and extend service life.
Efficient Assembly: The three-piece pre-combination saves time on sorting and assembling individual parts (e.g., bolts and washers), improving work efficiency by 30%-50% in mass production scenarios (such as appliance assembly lines).
Reliable Fastening: The internal hexagon drive ensures stable torque transfer, avoiding slipping or head damage during tightening. The spring washer in the three-piece set provides anti-loosening performance, preventing the screw from loosening due to vibration (suitable for small machinery or equipment).
Corrosion Resistance: The galvanized coating gives the screw good rust resistance, making it applicable to both indoor humid environments (e.g., kitchen appliances, bathroom hardware) and mild outdoor environments (e.g., outdoor light fixtures, garden furniture).
Versatile Compatibility: Compatible with standard nuts and tapped holes (threaded holes). It can be used with manual Allen keys, electric screwdrivers, or automated assembly tools, adapting to both DIY projects and industrial production.
Home Appliances: Used for fastening components of refrigerators, washing machines, microwave ovens, and air conditioners—leveraging efficient assembly and rust resistance to meet the needs of appliance manufacturing and maintenance.
Furniture & Hardware: Secures cabinet hinges, drawer slides, metal furniture frames, and door locks. The cylindrical head ensures a neat appearance, while the three-piece design simplifies installation for furniture assemblers.
Light Industrial Equipment: Assembles small electric tools (e.g., hand drills, grinders), water pumps, fans, and power distribution boxes—relying on anti-loosening performance to maintain stability during equipment operation.
Outdoor & Daily Hardware: Applied to outdoor light brackets, mailboxes, and garden fences. The galvanized coating resists rain and moisture, preventing rust and ensuring long-term use.
Match the Right Tool: Use an Allen key of the exact size corresponding to the internal hexagon recess to avoid damaging the screw head or tool slippage.
Control Tightening Torque: For precision components (e.g., electronic device casings), use a torque wrench to prevent over-tightening (which may strip threads) or under-tightening (which causes loose connections).
Select Appropriate Galvanization Type: Choose electro-galvanized screws for indoor dry/wet environments (thinner coating, cost-effective) and hot-dip galvanized screws for harsher outdoor environments (thicker coating, stronger corrosion resistance).
