TNHO Lock Hex Nuts for Industrial Fastening
Our hex nut series includes standard hex nuts, thin nuts, staked lock nuts and nylon insert lock nuts. Made of...
These two-in-one pre-assembled combination screws integrate screw body with flat/square washer in one piece, covering complete specs of M3×6/M3×7/M3×8, M4×35, M5×8/M5×9. Available in slotted, Phillips combo drive, pan head, flat head and tapered tail types with zinc-plated steel and brass finish. Pre-mounted washer eliminates separate gasket assembly work, effectively preventing loose connection for electric meter shell, terminal block and internal component fastening, widely used in power metering equipment production and maintenance.
| System of Measurement | Metric |
|---|---|
| Material | Zinc-plated Carbon Steel, H62 Brass |
| Standard Sizes | M3×6, M3×7, M3×8, M4×35, M5×8, M5×9, customized non-standard dimension |
| Head Type | Pan Head, Flat Head, Tapered Tail Head |
| Drive Style | Slotted, Phillips, Phillips & Slotted Combo Drive |
| Washer Form | Flat Washer, Square Serrated Washer |
| Surface Treatment | Electro Zinc Plating, Natural Brass Finish |
| Production Process | Cold Heading, Thread Rolling, Automatic Washer Pre-assembly |
| Executive Standard | ISO, DIN, GB, ANSI, Custom drawing specification |
| Grade | 4.8 Grade Carbon Steel, H62 Copper |
| Application | Electric Meter Housing, Terminal Block, Inner Component Fixing |
1.Integrated pre-assembled two-in-one structure: Screw and washer are pre-mounted integrally to save manual washer loading operation during on-site component installation.
2.Rich diversified structural & dimensional options: Various head, drive and washer types plus full M3~M5 sizes cover most conventional meter component fixing scenarios.
3.Two optional high-quality raw material grades: Zinc-plated carbon steel for cost-efficient mass production and brass for better conductive & anti-corrosion terminal application.
4.Precision rolled standardized screw thread: Thread rolling technology ensures tight meshing to prevent thread slipping and component loosening under long-term equipment vibration.
5.Fixed anti-drop pre-clamped washer design: Pre-crimped washer cannot fall off from screw shank to avoid missing parts during high-speed automated assembly.
Remarkably improved production assembly efficiency
Preassembled structure cuts extra gasket fitting step to lower manual labor cost for meter factory assembly lines effectively.
Strict anti-loosening connection performance
Closely fitted washer evenly distributes compression force to enhance anti-vibration fastening stability of meter internal parts.
Flexible personalized OEM customization capability
We modify thread length, head shape and washer size strictly according to clients’ unique meter design drawings and sample demands.
Excellent environmental adaptability of surface coating
Standard zinc plating and brass finish deliver reliable rust resistance for indoor electrical cabinet and meter box long-term usage.
Ready spot stock for mainstream regular specifications
Core common M3/M4/M5 sizes are stocked in warehouse to support quick delivery of small sample orders and urgent bulk purchase.
Wide compatibility with global power meter standards
Product dimension and mechanical indicators comply with international fastener norms for matching various imported and domestic electric meter products.
