TNHO Non‑Hole Lead Seal Tamper‑Proof Screws for Electric Meters
These non‑hole lead seal security screws are professionally designed for electric meters and metering boxes. Made by cold heading and...
Our custom step shoulder screw series includes square head, flower head, and tapered tail types in standard sizes M6×18, M8×17.5, M8×24. Available in black oxide and zinc plating, they feature precision stepped design for accurate positioning and limiting. Widely used in electric meter shell, terminal block, and PCB assembly, these screws provide reliable axial positioning and load-bearing performance, meeting special fastening requirements for power metering equipment with unique structural needs.
| System of Measurement | Metric |
|---|---|
| Material | High Strength Carbon Steel |
| Standard Sizes | M6×18, M8×17.5, M8×24, custom non-standard dimensions available |
| Head Type | Square Head, Flower Head, Tapered Tail Head |
| Surface Treatment | Black Oxide, Zinc Plating |
| Special Feature | Precision Stepped Shoulder Design |
| Production Process | Cold Heading, Precision Machining, Thread Rolling |
| Executive Standard | ISO, DIN, GB, Custom Drawing Specification |
| Application | Electric Meter PCB Positioning, Terminal Block Limiting, Shell Assembly |
1.Precision stepped shoulder positioning design: The shoulder accurately controls screw insertion depth, providing reliable axial positioning and limiting for meter components.
2.Diversified head shape options: Square head, flower head and tapered tail head designs adapt to different meter assembly and anti-tamper needs.
3.Two anti-corrosion surface treatments: Black oxide for general use and zinc plating for enhanced rust resistance in damp environments.
4.High-strength carbon steel material: Provides excellent mechanical strength and load-bearing performance for long-term use in power metering equipment.
5.Fully customizable dimensional parameters: Head shape, shoulder size, step height and thread length can be tailored to customer requirements.
Accurate positioning and limiting function
The precision stepped design eliminates the need for additional spacers, ensuring consistent component installation depth.
High mechanical strength and durability
Carbon steel material has good tensile and shear resistance, suitable for repeated assembly and disassembly.
Customized solutions for special structures
Modify head shape, step dimensions and thread parameters to match unique meter design requirements.
Excellent anti-corrosion performance
Zinc plating and black oxide treatments meet the environmental adaptability needs of indoor and outdoor meter cabinets.
High-precision machining quality control
Strict dimensional tolerance control ensures consistent performance and interchangeability of each screw.
Spot inventory for mainstream specifications
Standard sizes are stocked in large quantities, supporting fast delivery of small samples and bulk orders.
