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 hexagon socket set screw series includes cup point, cone point, dog point and flat point types, in metric and unified thread sizes. Made of high-strength steel with nickel or black oxide finishes, these headless set screws are designed for locking shafts, positioning components and eliminating backlash in electric meters. With a full range of point styles, they meet different anti-rotation, anti-slip and high-load requirements, ideal for meter internal assembly where a flush, tamper-resistant fastener is needed.
| System of Measurement | Metric |
|---|---|
| Material | High-strength alloy steel |
| Standard Sizes | Metric: M3-M14, etc. |
| Point Styles | Cup Point, Cone Point, Dog Point, Flat Point |
| Drive Type | Hexagon Socket (Allen) Drive |
| Surface Treatments | Nickel Plating, Black Oxide |
| Production Process | Cold Heading, Precision Thread Rolling, Heat Treatment |
| Executive Standard | ISO 4029/4027, DIN 913/914/915/916, GB/T 71/73/75/78 |
| Application | Electric Meter Shaft Locking, Component Positioning, Anti-Backlash Assembly |
1.Multi-style point design for diverse locking needs: Cup, cone, dog and flat point options adapt to anti-slip, alignment, positive locking and pressure distribution requirements.
2.Headless structure for flush installation: No external screw head ensures a smooth surface, ideal for meter components where tamper resistance and space saving are required.
3.High-strength alloy steel material: Provides excellent shear strength and torque resistance for long-term use in high-vibration meter environments.
4.Two anti-corrosion surface treatments: Nickel plating for enhanced rust resistance and black oxide for anti-seize performance in different working conditions.
5.Precision internal hex drive: Ensures stable torque transmission and reduces the risk of cam-out during repeated installation and removal.
Tailored solutions for different locking applications
Multiple point styles provide optimal grip, alignment or pressure distribution for various meter components.
Tamper-resistant flush design
The headless structure eliminates external protrusions, preventing unauthorized disassembly in anti-tamper meter equipment.
Excellent mechanical performance
High-strength alloy steel with heat treatment provides reliable shear and torque resistance under continuous vibration.
Wide range of standard and custom sizes
Metric and unified thread specifications meet the needs of both domestic and imported meter equipment.
Cost-effective bulk procurement
Standard sizes are stocked in large quantities, supporting fast delivery of small samples and large production orders.
Full compliance with international standards
Manufactured to ISO and DIN specifications, ensuring interchangeability and reliability in power metering equipment.
