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Rollercen Industrial Group, Allen and Metric Polist Storing Exchange in Qazvin Square, Tehran

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🔩 The difference between iron, steel, brass and galvanized bolts and nuts

In the world of industry and construction, choosing the type of bolts and nuts is as important as design and execution. Each material has its own technical characteristics and specific application, and its correct selection guarantees the durability and safety of the structure to a large extent. In the following, we will examine the difference between the four main types of bolts and nuts:



⚙️ Iron bolt and nut

Features:





Made of plain carbon steel



High resistance to pressure and impact



Reasonable and economical price



No anti-rust properties (it rusts in moisture)

Applications:





Construction and metal structures in dry space



Automobile and heavy machinery industry



Projects that require high mechanical resistance

Tip: To prevent rusting in a humid environment, the screws can be painted or coated with rustproofing.



📸 Image number 1: Iron bolt and nut



🌊 Steel bolt and nut (anti-rust)

Features:





Made of stainless steel (with chrome and nickel)



Resistant to corrosion and moisture



Shiny and beautiful appearance



Higher price than iron models

Applications:





Food and pharmaceutical industries



Marine structures and wet locations



Facade and decorative equipment

Tip: Steel is the best choice for places exposed to water or high humidity.



📸 Image number 2: Steel bolts and nuts



Brass bolt

Features:





Made of copper and zinc alloy



Electrically conductive and resistant to ordinary rust



Softer than steel and iron



Golden color and attractive appearance

Applications:





Electrical and electronic industries



Decorative equipment



Accurate and delicate devices

Note: special appearance and good conductivity make brass more used in decorative and electrical cases.



📸 Picture number 3: Brass bolt and nut



⚪ Galvanized bolts and nuts

Features:





The base material is steel, but coated with zinc



Excellent resistance to rust



The price is lower than steel and high durability



Matte silver appearance

Applications:





Outdoor industries such as masts, fences and metal roofs



Structures related to water and sewage



Semi-humid environments

Tip: Galvanized is the best economic option for balance between durability and price.



📸 Picture number 4: Galvanized bolts and nuts



🔍 Final comparison table

Material, rust resistance, mechanical resistance, appearance, application, iron, low, high, dark gray, building, dry environment, steel, very high, high, shiny, silver, food industry, marine, brass, medium, medium, gold, electric, decorative, galvanized, high, high, matte silver, semi-humid environments, outdoor



Summing up

Choosing the type of bolts and nuts does not depend only on appearance or price; Rather, working conditions, ambient humidity and pressure should be taken into account.

If your project is in a humid environment, steel is more suitable; They are the best options for dry, iron or galvanized metal structures; And for decorative or electrical work, brass is an ideal choice.

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