TNHO Triangular Security Screws for Electric Meter Anti-Tamper Fastening
Our triangular security screw series features a unique triangular drive, designed exclusively for electric meter anti-tamper fastening. Made of 304...
These non‑hole lead seal security screws are professionally designed for electric meters and metering boxes. Made by cold heading and cold forging, they feature high strength, stable locking, and one‑way/break‑off anti‑disassembly. With special drive slots and non‑hole structure, they prevent unauthorized opening, ensure traceable sealing, and are durable for long‑term use in power metering equipment.
Zhejiang TNHO non‑hole lead seal tamper‑proof screws are ideal for electric meters and metering boxes. Adopting cold heading/cold forging process, they deliver stable thread and reliable locking. Non‑hole design, special drive slots and anti‑disassembly structure effectively stop illegal opening. Widely used in power equipment, they meet international standards and support customized requirements.
| System of Measurement | Inch, Metric |
| Material | Stainless Steel, Carbon Steel, Steel, Brass, Iron, Aluminum |
| Thread Size | Metric: M1-M16; or customized |
| Head Type | Pan Head, Hex Head, Slotted Head, Torx Head, One-Way Head, Step Head, Flat Head, Large Head |
| Surface Finishing | Zinc Plating, Nickel Plating, Black Oxide, Dacromet |
| Production Process: | Cold Heading, Cold Forging，Cold Forming |
| Standard | ISO, JIS, GB, ANSI, BSW, DIN, Non-standard customized |
| Grade | 4.8, 6.8, 8.8, 12.9, etc |
| Brand | TNHO |
| Application | Electric Meter, Electrical, Electronic, Auto Parts, Renewable Energy Industry, etc. |
1.Non‑hole lead seal structure: No exposed hole, better anti‑tamper and sealing performance for electric meters.
2.Anti‑disassembly design: One‑way or break‑off structure prevents non‑destructive opening and unauthorized operation.
3.Stable cold forging quality: Cold heading/cold forging ensures high strength, durable threads and long service life.
4.Special drive slots: Available in 11‑slot, Phillips, slotted for professional and safe installation.
5.Traceable sealing: Perfect for metering box sealing to ensure safety and management traceability.
Complete non‑hole lead seal series
One‑stop supply covering multiple drives and head types for electric meters.
Mature cold forming process
Stable batch quality, high consistency and strong mechanical performance.
Full customization support
Custom size, material, surface treatment and non‑standard design accepted.
International standard compliance
Meet ISO, DIN, GB, ANSI for reliable use in electrical industry.
Authoritative certifications
ISO9001, ISO14001, ISO45001, IATF16949 certified quality system.
Efficient global service
Fast quotation, on‑time delivery, support OEM/ODM and long‑term cooperation.
