8-32 10-24 External Hexagon Slotted Green Zinc Grounding Screw. This grounding screw is a specific specification grounding screw primarily used for grounding electrical equipment or metal structures. Below is an introduction to customizing it.
I. Basic Parameter Requirements
Specifications and Models
Thread Size: American Standard, two sizes available: #8-32 UNC (approximately 4.2mm diameter, 0.79mm pitch)
#10-24 UNC (approximately 4.8mm diameter, 1.06mm pitch)
Length: Customizable upon request.
Head Design: External Hexagon + Slotted: Hexagonal across-flat dimensions must conform to ANSI standards. The slotted slot must be ≥1mm wide and deep enough to ensure a secure screwdriver engagement.
Surface Treatment: Green zinc plating conforms to ASTM standards. B633 standard, salt spray test ≥ 96 hours (white rust), coating thickness 8-12μm, RoHS environmental certification required.
II. Functional and Process Details
Grounding Performance
Optimized Conductivity: The screw tail must have a sharp guide tip or serrations to ensure direct contact through the paint layer and contact with the metal substrate, with a contact resistance of <0.1Ω.
Anti-Loosening Design: Available with nylon inserts or double nut options.
Groove Type and Strength
Slotted Slot Compatibility: The slot depth must accommodate a standard slotted screwdriver, with a slot wall angle ≤30° to prevent slippage.
Mechanical Properties: Minimum Grade 4.8, material selected: Low or medium carbon steel, heat-treated hardness HRC 22-32.
III. Customization Process and Acceptance
Drawings and Samples
You must provide CAD drawings (including tolerance markings) or confirm our design draft. Full-scale testing of 3-5 first samples will be required.
Packaging and Labeling
Inner packaging: Anti-rust paper + PE bag. Outer box printed with specifications/quantity/batch number; optional label "GROUND" "SCREW" + green zinc color code.
MOQ and Delivery Time
Minimum Order Quantity: 5,000 pieces/specification. Mass production lead time: 15-20 days. Expedited orders incur a 30% fee.
IV. Optional Additional Features
Non-standard customization: Options include stamping a grounding symbol on the head, replacing copper plating, or extending the shaft.
Certification Support: UL/CE certification documents available.
This ensures that the screws meet the requirements for mechanical strength, grounding reliability, and corrosion resistance. Further discussion of specific application scenarios is recommended to optimize details.
Through the above design, these screws achieve a balance between electrical safety and mechanical reliability, making them cost-effective, standardized components in grounding systems.
