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 slotted set screw series includes cup point, cone point, dog point and flat point types, in metric and unified thread sizes. Made of stainless steel or carbon steel with nickel, zinc or black oxide finishes, these headless set screws are designed for locking shafts, positioning components and eliminating backlash in electric meters. With a slotted drive for flathead screwdriver installation, they offer a flush, tamper-resistant fastening solution for meter internal assemblies.
| System of Measurement | Metric |
|---|---|
| Material | 304 Stainless Steel, High-strength Carbon Steel |
| Standard Sizes | Metric: M6-M10, etc. |
| Point Styles | Cup Point, Cone Point, Dog Point, Flat Point |
| Drive Type | Slotted (Flathead) Drive |
| Surface Treatments | Nickel Plating, Zinc Plating, Black Oxide |
| Production Process | Cold Heading, Precision Thread Rolling, Heat Treatment |
| Executive Standard | ISO 4029/4027, DIN 553, 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.Multiple material and surface finish options: Stainless steel, plated steel and black oxide provide tailored corrosion resistance for different working conditions.
4.Slotted drive for standard screwdriver use: Compatible with common flathead screwdrivers, making installation and maintenance convenient without special tools.
5.Precision rolled standard metric/unified threads: Consistent pitch and dimensional accuracy ensure smooth assembly and reliable clamping force.
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.
