L Type Wood Screw

Product Introduction

• Standard Name: Lag Screw (Square-Head Wood Screw) or Coach Screw (British term).

• Common Names: Hex-Head Wood Screw, Coach Screw, Square-Head Screw.

• Product Definition: A woodworking screw featuring a hexagonal or square head with coarse, deep threads, requiring a wrench rather than a screwdriver for installation. Specifically designed for high-strength, heavy-load connections between wood-to-wood or wood-to-concrete applications.

L-Type Wood Screw Key Features

• L-shaped hook design: The overall shape is L-shaped or 7-shaped, with one end featuring a self-tapping

  wood screw thread and the other end a right-angle hook, facilitating the hanging of items and providing

  a secure hanging point.

• Self-tapping thread: Sharp tip and coarse thread for easy insertion into wood without pre-drilling

  (except for hardwoods), providing strong holding power.

• Material and coating: Commonly made of carbon steel, with surface treatments such as zinc plating (ZP),

  yellow zinc plating (YZP), or blackening, providing basic to moderate corrosion resistance.

• Diverse specifications: Thread diameters M3-M6, hook lengths 10-50mm, total lengths 20-80mm,

  commonly available in silver or black.

• Advantages: Easy installation, moderate load capacity, economical and practical, aesthetically pleasing

  and discreet.

Working Principle

• Self-tapping insertion: The sharp tip penetrates the wood, and the coarse threads cut and compress the

  fibers, creating a secure hold.

• Hook fixation: The L-shaped hook end is exposed for hanging items, generating vertical or horizontal

  tension.

• Load distribution: The threaded portion evenly bears the tensile force, preventing pull-out; the coating

  reduces friction and provides corrosion protection.

• Installation control: Manually or tool-driven insertion, avoiding overtightening to prevent wood splitting;

  the principle involves self-tapping interlocking and frictional grip.

Product Applications

• Home decoration: Hanging plants, lamps, picture frames, or curtain rods, both beautiful and practical.

• Kitchen and storage: Hanging cups, tools, or kitchen utensils, providing convenient storage.

• Wardrobes and coat racks: Fixing coat hooks, key hooks, or clothing, with discreet installation.

• DIY and woodworking: Home repairs or project assembly, suitable for wooden walls or furniture.

• Outdoor light-duty applications: Hanging on fences or pergolas; yellow zinc plated versions are resistant

  to light moisture.