Nut Bolt Materials & Grades – SS, MS, GI, Nylon Types with Strength & Use Guide
Nut Bolt Materials & Grades – SS, MS, GI, Nylon Types with Strength & Use Guide (2025)
Introduction
Not all nuts and bolts are made the same. The choice of nut bolt material determines performance, lifespan, strength, and resistance to rust or wear. In this guide, we compare SS, MS, GI, Nylon, and Iron nut bolts with focus on their price, mechanical properties, corrosion resistance, and recommended usage in various sectors like automotive, construction, and marine.
Stainless Steel Nut Bolt (SS 304 / SS 316)
Material: Chromium-nickel alloy (18-8 grade typical for SS 304)
Grades: SS 304 (general purpose), SS 316 (marine-grade)
- Corrosion Resistance: Excellent (even in saltwater environments)
- Strength: High tensile strength (500+ MPa)
- Appearance: Shiny silver finish, rust-free
- Applications: Marine, food processing, chemical plants, pharma
- Drawback: More expensive than MS and GI
Common Sizes: M4 to M24
Average SS Nut Bolt Price (2025): ₹280 – ₹450/kg
Mild Steel Nut Bolt (MS)
Material: Low carbon steel
Grades: IS 1367 Class 4.6, 5.6, 8.8 (tensile strength categories)
- Corrosion Resistance: Low (requires painting or coating)
- Strength: Moderate (tensile 320–800 MPa depending on class)
- Applications: Structural fabrication, general engineering, ducting
- Advantage: Inexpensive and easy to weld or machine
Common Sizes: M5, M6, M8, M10, M12, M16
MS Nut Bolt Price Per KG (2025): ₹75 – ₹120
Galvanized Iron Nut Bolt (GI)
Material: Mild steel coated with zinc
Coating: Hot Dip Galvanizing (HDG) or Electroplated Zinc
- Corrosion Resistance: Good for outdoor and moist conditions
- Strength: Similar to MS (based on core steel)
- Applications: Water pipelines, electric poles, fencing
- Finish: Dull grey to silver based on coating method
Common Sizes: M6 to M20
GI Nut Bolt Price Per KG (2025): ₹100 – ₹160
Nylon Nut Bolt
Material: Nylon or reinforced polymer composites
- Corrosion Resistance: Excellent (non-metallic)
- Strength: Low to moderate
- Temperature Tolerance: Up to 100°C
- Applications: Electronics, toys, furniture, and electrical boards
- Advantages: Lightweight, no rust, non-conductive
Price Range: ₹400 – ₹600/kg (varies based on color and grade)
Iron Nut Bolt
Material: Forged or cast iron (uncoated or painted)
- Corrosion Resistance: Very poor unless coated
- Strength: Good compressive strength, low flexibility
- Applications: Heavy load assemblies, older infrastructure, OEMs
- Usage Declining: Mostly replaced by MS or alloy steel
Note: May still be used in cast iron assemblies or old machinery.
Comparison Table – Nut Bolt Materials
| Material | Corrosion Resistance | Tensile Strength | Price Per KG (₹) | Use Case |
|---|---|---|---|---|
| SS 304 | Excellent | 500+ MPa | ₹280 – ₹350 | Marine, food, pharma |
| SS 316 | Superior | 580+ MPa | ₹350 – ₹450 | Saltwater, chemicals |
| MS | Low | 320 – 800 MPa | ₹75 – ₹120 | Construction, fabrication |
| GI | Moderate | Same as MS | ₹100 – ₹160 | Outdoor, utility poles |
| Nylon | Excellent | Low | ₹400 – ₹600 | Non-conductive, lightweight |
| Iron | Poor | Varies | ₹60 – ₹90 | Legacy machinery |
Industry Use Cases by Material
- SS Nut Bolt: Used in coastal projects, marine engineering, and cleanrooms.
- MS Nut Bolt: Widely used in scaffolding, structures, and brackets.
- GI Nut Bolt: Ideal for water tank fittings, solar mounts, and outdoor fastenings.
- Nylon Nut Bolt: Common in electric switchboards, toys, drones, and DIY kits.
FAQs – Nut Bolt Materials
- Q. Which is better – MS or GI Nut Bolt?
- GI nut bolts are better for outdoor use due to rust resistance, while MS is suitable for indoor fabrication.
- Q. What does SS 304 and SS 316 mean?
- SS 304 is general stainless steel; SS 316 has molybdenum for extra corrosion resistance, ideal for marine use.
- Q. Can nylon nuts be used in load-bearing applications?
- No, nylon bolts are not suitable for high-torque or structural applications.
- Q. Are iron bolts still used?
- Rarely. They’ve mostly been replaced by mild steel and alloy fasteners in modern systems.
9. Download Guide
Download Full Nut Bolt Material Guide PDF for specifications, prices, and application-based selection.
10. Related Pages
- Nut Bolt Price Per KG – MS, GI, SS Fasteners
- Nut Bolt Size Chart – All mm & Inch Dimensions
- Types of Nuts and Bolts – Head, Thread & Style Comparison
Udhhyog – India’s Fastener Supply Authority
Visit: www.udhhyog.com | Call: +91-9311120784
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