Through Screw/Self-tapping Screw

Through screw refers to full-length threaded fasteners that penetrate completely through two or more connected workpieces, matched with nuts and washers for locking assembly. The entire shank is covered with standard machine thread, no self-tapping tooth structure.

Core Features

Uniform standard metric/imperial thread, high precision, interchangeable with standard nuts.

Passes through pre-drilled smooth holes of the base material; relies on nut clamping force to fix parts.

High tensile and shear strength, suitable for thick plate, metal profile, steel frame, heavy load connection.

Repeated disassembly without damaging the workpiece hole, reusable for multiple assembly cycles.

Widely used in steel structure, machinery equipment, cabinet frame, pipeline bracket, automobile chassis assembly.

Application Scenarios

Connection of thick metal plates, equipment frames, construction steel supports, electrical cabinet shells, agricultural machinery components.

2. Self-tapping Screw

Definition

Self-tapping screw is a special fastener with sharp tapping threads and a pointed tip. It can cut matching internal threads directly into pre-drilled thin plates without pre-tapping threads or auxiliary nuts.

Core Features

Sharp thread tooth design and pointed end: self-form internal threads when screwed into thin materials.

No nut required, simplifies installation process, reduces assembly accessories and labor cost.

Multiple head types available: pan head, countersunk head, hex head, truss head to fit different installation surfaces.

Surface treatment options: zinc plating, black oxide, stainless steel passivation for rust resistance.

Limited to thin workpieces (thin steel, aluminum alloy, plastic, wood, color steel tile); not suitable for thick solid metal.

Application Scenarios

Color steel roofing, plastic housing, aluminum alloy profiles, furniture wood board, electrical appliances shell, light steel keel installation.