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...
Our knurled thumb screws include hand-tightening and Phillips drive types in standard M4×28 size, made of zinc-plated carbon steel. The diamond knurl on the head offers a non-slip grip for tool-free installation and removal, while the optional cross drive allows secondary tightening with a screwdriver. These thumb screws are widely used for electric meter cover, access panel and filter door quick assembly, ideal for frequent maintenance scenarios without special tools.
| System of Measurement | Metric |
|---|---|
| Material | Low Carbon Steel |
| Standard Size | M4×28, custom non-standard dimensions available |
| Head Type | Knurled Hand Tightening Head, Knurled Phillips Combo Head |
| Surface Finish | Blue-White Zinc Plating |
| Production Process | Cold Heading, Thread Rolling, Knurl Forming |
| Executive Standard | ISO, DIN, GB, Custom Drawing Specification |
| Application | Electric Meter Cover, Access Panel, Maintenance Door Quick Fastening |
1.Anti-slip diamond knurl texture design: The knurled pattern on the screw head provides high friction for secure hand-tightening without slipping.
2.Dual-function optional Phillips cross recess: Combo head design allows both tool-free hand operation and screwdriver-assisted torque adjustment.
3.Precision rolled standard metric thread: Thread rolling ensures consistent pitch for smooth screwing and durable repeated use.
4.Bright zinc-plated anti-corrosion surface: Zinc plating protects against oxidation and rust in indoor and mildly humid meter cabinet environments.
5.Customizable thread length and structure: Available in standard M4×28 and custom sizes to match various meter cover thickness and assembly needs.
Eliminates the need for tools during maintenance
Tool-free hand tightening significantly improves the efficiency of meter cover disassembly and inspection work.
Dual-operation mode improves versatility
Can be quickly adjusted by hand or tightened with a screwdriver to meet different torque requirements.
Cost-effective zinc-plated carbon steel construction
Balances reliable performance and budget for mass procurement by meter manufacturers.
User-friendly design reduces maintenance risk
The non-slip knurl head avoids accidental scratches and injuries during frequent operation.
Highly compatible with standard meter shell nuts
Matches standard metric threads used in most domestic and imported electric meter covers.
Ready stock for the mainstream M4×28 specification
Fast delivery of spot inventory for small sample orders and urgent bulk purchase demands.
