Fastener Strength Guide: Understanding Grades and Strength Levels
Choosing the right fastener involves more than just size—it’s about selecting the correct grade and strength level, especially when working with stainless steel. This guide breaks down the different grades and strength levels, including imperial grades like 316 and 318, and metric grades such as A2 and A4. Bookmark this page on www.canadabolts.ca for reliable information to help you make the best choice.
Fastener Strength Grades and Levels
| Grade | Imperial | Metric | Tensile Strength (psi) | Common Uses |
|---|---|---|---|---|
| Grade 2 | Yes | N/A | 74,000 | General-purpose applications, low-stress environments |
| Grade 5 | Yes | N/A | 120,000 | Automotive, machinery, medium-strength applications |
| Grade 8 | Yes | N/A | 150,000 | Heavy equipment, high-stress applications |
| Class 8.8 | N/A | Yes | 120,000 | Construction, automotive, machinery |
| Class 10.9 | N/A | Yes | 150,000 | High-stress automotive, industrial applications |
| Class 12.9 | N/A | Yes | 170,000 | Critical applications requiring maximum strength |
| Stainless Steel 316 | Yes | N/A | 80,000 | Marine environments, high corrosion resistance |
| Stainless Steel 18-8 | Yes | N/A | 75,000 | Chemical processing, high temperature, and corrosion resistance |
| Stainless Steel A2 | N/A | Yes | 70,000 | General-purpose, outdoor environments |
| Stainless Steel A4 | N/A | Yes | 85,000 | Marine and chemical applications, high corrosion resistance |
How to Use This Guide
- Identify your application: Consider the environmental conditions and stress levels your project will face.
- Choose the correct grade: Use the table to select the appropriate fastener grade based on tensile strength and corrosion resistance, whether it’s for general use, high-stress applications, or environments with high corrosion.
- Ensure optimal performance: Selecting the right fastener grade is crucial for safety, durability, and the overall success of your project.
Why Stainless Steel Grades Matter
Stainless steel fasteners are particularly valued for their:
- Corrosion Resistance: Stainless steel grades like 316, 318, A2, and A4 offer excellent protection against rust and corrosion, making them ideal for outdoor and marine environments.
- Durability: The strength and resilience of these grades ensure that your fasteners will last in even the most demanding conditions.
- Temperature and Chemical Resistance: Grades like 318 and A4 are designed to withstand high temperatures and harsh chemical environments, ensuring reliability and safety.