Square Thin Nut

Square Thin Nut — Product Introduction

The DIN 562 - 1987 square thin nut (also known as square nut or thin square cap nut) is a fastening nut with a square profile and relatively slim thickness. It complies with the German standard DIN 562 and is mainly used in T-slots, fixtures, jigs, adjustment mechanisms, and applications requiring anti-rotation or axial space saving.

The nut is typically used together with T-slot bolts, square-head bolts, or dedicated bolts; its square shape locks into a slot or sits flush against the workpiece surface, preventing the nut from turning while being tightened. Common materials include carbon steel, stainless steel A2/A4, and brass, with surface finishes such as zinc plating, black oxide, phosphating, and polishing.

I. Product Features

• Square profile: The square outer shape can lock into T-slots, square holes, or be positioned against a flat surface, providing excellent anti-rotation performance.
• Thin design: Thinner than ordinary square nuts, suitable for installation locations with limited axial space.
• Standardized production: Complies with DIN 562, with uniform dimensions and good interchangeability, convenient for selection and replacement.
• Diverse materials and finishes: Options in carbon steel (zinc-plated, black oxide, etc.), stainless steel A2/A4, and brass, adapting to different corrosive environments and aesthetic requirements.
• Simple machining, lower cost: The square thin nut has a simple structure, suitable for mass production with good economy.
• Wide range of common sizes: Generally covers various thread sizes from M2 to M24, meeting the needs from small instruments to medium-sized equipment.

II. Product Advantages

• Reliable anti-rotation: The square shape locks directly into T-slots or square holes, preventing the nut from spinning during tightening without the need for extra tools to hold it.
• Space-saving installation: The thin profile makes it especially suitable for mounting in narrow, thickness-limited components.
• Economical and practical: Compared with hex nuts or dedicated lock nuts, the square thin nut has a simple structure and low manufacturing cost, ideal for batch use.
• Easy installation and adjustment: It can slide directly into the slot opening, allowing quick positioning and adjustment and improving assembly efficiency.
• Rich corrosion-resistant options: Stainless steel or brass materials can meet requirements of humid, mildly corrosive, or electrical special environments.
• Strong versatility: Compatible with T-slot bolts, square-head bolts, and various fixtures, guide rails, and worktables.

III. Application Scope

• Machine tools and worktables: Used on T-slot worktables, milling machines, drilling machines, fixture plates, etc., together with T-slot bolts to secure workpieces or fixtures.
• Fixtures and jigs: As positioning, clamping, and adjustment elements, widely used in machining, welding, inspection, and other tooling.
• Instruments and electronic equipment: Small square thin nuts are suitable for light-load connections such as instrument housings, terminal blocks, and circuit board fastening.
• Electrical and lighting: Brass or stainless steel materials are often used in electrical connections and lamp installation, combining conductivity and corrosion resistance.
• Furniture and decoration: Used for sheet connection, decorative panel fastening, and applications requiring a neat exposed appearance.
• General mechanical assembly: Suitable for fixed connections where nut rotation must be prevented and load is light, such as adjustment mechanisms and guide devices.