Nuts – How to Choose the Right Type for Every Application

Understanding basic nut types

Nuts are classified by shape, purpose and locking mechanism. Standard hexagonal nuts are most common and come in metric sizes from M3 to M36. Lock nuts use different mechanisms to prevent self-loosening due to vibration – typically a nylon insert or special thread design.

When to use lock nuts

Lock nuts are essential in applications subject to vibration – machinery, engines, vehicles, industrial equipment. The Sigurnosne brand offers a wide range of self-locking nuts with nylon rings that prevent loosening without tools. Never use a standard nut where a lock nut is required – this can cause serious failures or safety hazards.

Materials and strength grades

Markings like 8.8 or 10.9 indicate the nut's strength measured in MPa – higher numbers mean greater tensile resistance. Steel nuts with zinc plating provide corrosion protection in dry conditions, while stainless steel nuts (A2 or A4 grade) are recommended for humid environments. Brass and aluminum nuts are used for lightweight structures or where electrical conductivity matters.

Checking thread compatibility

Always verify thread pitch before purchasing – metric nuts are marked as M8x1.25 where 1.25 represents the pitch in millimeters. Coarse pitch (M8x1.25) is standard, while fine pitch (M8x1.0) is used for precise adjustments. The Matica brand produces a wide range of standardized elements that comply with DIN and ISO standards for various applications.

Special nuts for specific purposes

Wing nuts allow hand-tightening without tools and are used on access panels and equipment covers. Cap nuts have a closed top that protects threads from dirt and provides a clean aesthetic appearance. Weld nuts are designed for permanent mounting on sheet metal or pipes using electrodes or spot welding.

What to check before buying

Always buy nuts of the same strength grade as the bolt you're using them with – a stronger nut on a weaker bolt can cause thread stripping. Verify whether you need fine or coarse thread variants as they are not interchangeable. For critical applications, invest in certified nuts with manufacturer markings on the surface – this guarantees material quality and production consistency.

Selection and Pricing

We offer 26 products from 2 brands across 1 sellers. Prices range from 200 to 6,770 RSD.