Steel Back Knurled Thumb Screw

 

Steel black knurled thumb screws are designed for easy hand-tightening. The straight knurling on the head increases friction, making hand-tightening more efficient. They are primarily used in the display industry, white goods, brown goods, telecommunications and data communications, automotive, and other industries requiring both insulation and frequent disassembly and maintenance.

High-strength carbon steel (Grade 8.8/10.9)
Made from high-quality carbon steel C45/1045, heat-treated and tempered to a hardness of HRC 28-32 and a tensile strength of ≥800 MPa (Grade 10.9), ensuring the screw maintains excellent structural integrity even under high loads.

Precision knurling design
The knurling has a pitch of 1.2mm and a depth of 0.3mm (compliant with ISO 9001 processing standards). The double-sided cross-knurling provides a 300% increase in torque friction (measured compared to a smooth surface), providing excellent anti-slip properties when operated barehand.

Ergonomic Contour
Head diameters are available from 8-50mm, with a 0.5mm edge chamfer. Pressure distribution tests show a 40% improvement in operating comfort compared to conventional designs.

Applications

‌Electronics‌: Widely used in components requiring frequent disassembly, such as displays, telecommunications equipment, and battery compartments. ‌

‌Mechanical‌: Used in industrial applications such as machinery, packaging machinery, and marine transmissions.

‌Home Appliances‌: Used for panel mounting and wiring maintenance in white goods and brown goods. ‌

Through its optimized design, this steel black knurled thumb screw balances ease of use and assembly strength, meeting frequent maintenance needs while reducing tool dependence.