Screw & bolt

An Overview of Our Screws and Bolts Collection

Screws and bolts are the fundamental components of modern engineering, and selecting the right fastener goes beyond just size. Our catalog covers a vast array of metric fasteners, ranging from precision machine screws to heavy-duty structural bolts. We specialize in supplying hardware that balances tensile strength with environmental resilience, serving industries ranging from general construction to marine engineering.

Material and Grade Guide for Fasteners

Choosing the correct material is critical for the longevity of your assembly. For general screws and bolts, the choice usually lies between the corrosion resistance of stainless steel and the high mechanical strength of carbon steel. Below is a comparison of our standard specifications to help you select the right grade for your application.

Material Grade	Tensile Strength (Min)	Key Characteristic	Best Use Case
Stainless Steel A2 (304)	700 N/mm² (Class 70)	Good corrosion resistance; non-magnetic (mostly).	General outdoor & indoor applications, automotive trim, food processing.
Stainless Steel A4 (316)	700 N/mm² (Class 70)	Superior corrosion resistance (Molybdenum added).	Marine environments, chemical plants, coastal construction.
Carbon Steel (Grade 8.8)	800 N/mm²	High tensile strength; Zinc plated for basic protection.	Structural joints, heavy machinery, applications requiring high load-bearing.

Quality Assurance and Documentation

We are committed to transparency and quality control in our supply chain. For customers requiring documentation, we provide EN 10204 Type 3.1 Material Test Certificates (MTC) free of charge upon request. Please ensure you indicate this requirement at the time of ordering to validate the chemical and mechanical properties of your batch. Third-party inspection services are also available for an additional fee.

Industrial Applications

Our metric fasteners are utilized across a diverse spectrum of sectors. Stainless steel bolts are heavily relied upon in the renewable energy sector (solar and wind) and water treatment facilities due to their anti-corrosion properties. Meanwhile, our high-tensile carbon steel screws are the standard for automotive manufacturing and steel framework construction where load capacity is paramount.

Frequently Asked Questions

What is the difference between fully threaded and partially threaded bolts?

In metric standards, this is often the distinction between DIN 933 (fully threaded) and DIN 931 (partially threaded). Fully threaded bolts are designed for use where grip is needed along the entire shaft or for insertion into threaded holes. Partially threaded bolts feature a smooth shank under the head, which offers greater shear strength and better alignment when bolting two unthreaded panels together.

How do I identify the thread pitch on your metric bolts?

Metric fasteners follow ISO standards. If the description simply says "M10", it refers to the standard coarse pitch (which is 1.5mm for M10). If a specific pitch is required, it will be marked as "M10 x 1.0" or "M10 x 1.25", indicating a fine thread. Coarse threads are more durable and assemble faster, while fine threads offer better vibration resistance.

Can I replace a Grade 8.8 steel bolt with an A2-70 stainless bolt?

Proceed with caution. While A2-70 stainless steel has excellent corrosion resistance, its yield strength (approx. 450 N/mm²) is lower than that of Grade 8.8 carbon steel (approx. 640 N/mm²). If the application is structural or under high stress, simply swapping materials without calculating load requirements can lead to failure. Always consult an engineer for critical joints.