Threaded inserts provide durable threads in soft, thin, or brittle materials like wood, plastic, or thin metal. The correct installation hole size is critical and depends entirely on the insert type and host material. Common types include helical coil (require tapped holes), press-fit/knurled (need undersized holes in soft materials - typically 90-95% of insert OD), self-tapping (need specific pilot holes), and molded-in. Always consult the manufacturer's data sheet for the exact hole size. For press-fit/knurled inserts in wood/plastic, the hole is slightly smaller than the insert's outer diameter (e.g., 0.002"-0.010" smaller). Incorrect hole size (too small/small/large/shallow) leads to failure. Proper installation (pressing, heating, threading) into a clean, perpendicular hole of the specified size and depth is essential for strong, reliable threads.

SMT (Surface Mount Technology) is the automated manufacturing process for attaching electronic components directly onto a PCB's surface. It involves solder paste printing, precise component placement, and reflow soldering. Key advantages include miniaturization, high-speed assembly, and improved performance. SMD (Surface Mount Device) refers to the components themselves designed for this process. Characterized by small size, flat leads (gull-wing, J-lead), or solder balls (BGA), SMDs include resistors, capacitors, ICs, and more. The core difference is that SMT is the method (how components are mounted), while SMDs are the parts (what is mounted). SMT enables the use of SMDs. Together, they dominate modern electronics manufacturing, enabling the compact, powerful devices found in smartphones, computers, automotive systems, medical equipment, and virtually all modern electronics. SMT is the technology; SMDs are the devices assembled by it.

To choose the correct Helicoil: Match Original Thread: Crucially identify the internal thread size & pitch (e.g., M6, 1/4"-20) using gauges or the original bolt. Determine Length: Measure hole depth. Standard = 1.5D (1.5x diameter). Use 2D/3D for high-strength or soft materials. Select Type: Tang (common), Tangless (blind holes), Solid Body (extreme loads). Choose Material: Standard steel, stainless (corrosion), or high-temp alloys. Essential Tools: Must use the specific STI tap & correct insertion mandrel. Summary: Match the internal thread size/pitch, determine length (1.5D/2D/3D), select type & material, ensure correct tools.

Wire thread inserts are precision helical coils of diamond-profile wire (often stainless steel) creating durable, high-strength internal threads in soft materials like aluminum or plastic. Their structure enhances load distribution and vibration resistance. Crucially, they significantly boost load capacity—joints can be 100% stronger than direct threads. Types include free-running (easy disassembly) and screw-locking (vibration-resistant). Standardized under according to standards such as DIN, they cover common thread sizes. Installation requires drilling an oversized hole, special tapping, inserting the coil with a mandrel, and tang removal if applicable. Wire thread inserts are essential in aerospace (airframes), automotive (engines), electronics, medical devices, and industrial machinery for reliable thread integrity in lightweight components.

Wire thread inserts repair/reinforce threads in soft materials. Two types: Free Running (FR) and Screw Locking (SL). FR Inserts: Standard internal thread without locking. Requires external methods for vibration resistance. Used in low-vibration repair/reinforcement. SL Inserts: Feature a deformed coil section creating friction with screw threads. Provides mechanical lock and vibration resistance without added devices. Critical for high-vibration applications (e.g., aerospace, engines). Both use diamond-shaped wire (stainless steel/bronze) with removable tang. Installation: Drill/tap oversized hole. Insert coil with type-specific tool. Break tang; check fit. Sized by nominal thread (M6, 1/4-20) and length. FR = standard threads; SL = critical vibration resistance.