Everything You Need to Know About Bolts for Industrial and DIY Use
Bolts are essential fasteners used in countless applications, from industrial machinery to household repairs. Understanding their types, features, and proper selection can save time and money while ensuring safety and durability.
How to Find Reliable Bolts from China in 2025
China remains a leading manufacturer of high-quality bolts at competitive prices. To find reliable suppliers:
- Check certifications like ISO 9001
- Review customer feedback and ratings
- Request material test reports
- Verify manufacturing capabilities
- Consider working with Alibaba Gold Suppliers
What Buyers Should Know Before Buying Bolts from China
When importing bolts from China, pay attention to:
- Material specifications (grade 8.8, 10.9, etc.)
- Surface treatments (zinc plating, hot-dip galvanizing)
- Minimum order quantities
- Shipping and customs requirements
- Payment terms and quality guarantees
Types of Bolts
Common bolt varieties include:
- Hex bolts - Most common for general applications
- Carriage bolts - Rounded head with square neck
- Lag bolts - Heavy-duty wood fasteners
- Eye bolts - For lifting applications
- U-bolts - For pipe and round object fastening
Functions and features of Bolts
Key characteristics that determine bolt performance:
- Tensile strength (measured in MPa)
- Thread pitch (coarse or fine)
- Corrosion resistance
- Temperature tolerance
- Vibration resistance
Scenarios of Bolts
Typical applications for different bolt types:
- Construction (structural bolts)
- Automotive (wheel bolts)
- Marine (stainless steel bolts)
- Aerospace (high-strength alloy bolts)
- Furniture assembly (machine bolts)
How to Choose Bolts
Selection factors to consider:
- Determine the load requirements
- Consider environmental conditions
- Match the bolt material to the application
- Select appropriate head style and drive type
- Choose the right length and diameter
Bolts Q & A
Q: What's the difference between bolts and screws?
A: Bolts typically require nuts for fastening, while screws thread directly into materials.
Q: How do I prevent bolts from loosening?
A: Use lock washers, thread-locking compounds, or double-nutting for critical applications.
Q: What bolt grade should I use for structural applications?
A: Grade 8.8 or higher is recommended for structural uses.
Q: How often should bolts be inspected?
A: Critical fasteners should be checked every 6-12 months or per manufacturer guidelines.
Q: Can I reuse bolts?
A: It depends on the application - high-stress or critical fasteners should not be reused.
