Stainless Steel Bolts Manufacturer In China
High-Quality SS Bolts supplier for Industrial, Construction & Marine Applications
Welle Fasteners is a professional custom SS Bolts Manufacturer & Supplier. We provide high-quality stainless steel bolts in A2-70 (SS304), A4-80 (SS316), duplex stainless steel, available in a wide range of sizes and types. We supply corrosion-resistant bolts that meet international standards including ASTM, DIN, and ISO, suitable for industrial, construction, marine, and machinery applications.
Types of Stainless Steel Bolts We Manufacture
Different Types of SS Bolts Explained
- Hex Tap Bolts– Fully threaded for strong holding in tapped holes; used in automotive and industrial equipment.
- Hex Bolts– Partial threading, used with nuts; common in construction and steel structures.
- Flange Bolts– Built-in washer for load distribution; ideal for pipelines and machinery.
- Heavy Hex Bolts– Wider, stronger heads for high-load applications like structural steel and heavy machinery.
- Carriage Bolts– Rounded head with square neck; perfect for wood structures and furniture.
- Stainless Steel U Bolts-Common in pipe, automotive, and structural support systems.
Custom Stainless Steel Bolts-We specialize in DIN bolts & ASTM bolts manufacturing based on customer drawings.
Stainless Steel Bolts Materials & Grades
High-Performance Stainless Steel Fasteners
We offer multiple stainless steel materials depending on application requirements.
Standard Materials:
AISI 304 / 304L
General purpose corrosion resistance
Construction and indoor applications
AISI 316 / 316L
Marine and chemical environments
High chloride resistance
A2-70 / A4-80 (ISO classification)
Standardized mechanical performance grades
Duplex Stainless Steel (2205)
High strength + superior corrosion resistance
Offshore and oil & gas applications
Material Certificates:
Mill Test Certificate (MTC EN 10204 3.1) available upon request.
Custom Stainless Steel Bolts Manufacturing Solutions
Reliable Stainless Steel Solutions for Harsh and Critical Environments
Our stainless steel bolts are produced using advanced manufacturing technology to ensure consistency and precision.
Production Capabilities:
Cold forging for high-volume production
Hot forging for large diameter bolts
CNC machining for precision components
Thread rolling for improved strength
Thread cutting for special designs
Surface Treatments:
Passivation for corrosion resistance
Polishing for aesthetic applications
Anti-galling treatment
Special coatings upon request
SS Bolts Size Range & Standards
High-Performance OEM Bolts for Corrosion-Resistant Applications
We produce stainless steel bolts in a wide range of sizes and international standards.
Size Range:
- Diameter: M3 – M64
- Length: 6mm – 2000mm
- Thread types: Metric, UNC, UNF, coarse & fine pitch
Standards Covered:
- DIN 931 / DIN 933
- ISO 4014 / ISO 4017
- ASTM A193 / A320
- ANSI / JIS standards
Applications of Stainless Steel Bolts
High-Strength SS Bolts for Automotive, Marine, Construction & More
Stainless steel bolts are widely used across multiple industries where strength, corrosion resistance, and long service life are required. They provide reliable fastening solutions for both standard and extreme environments.
Automotive & Machinery
Used in engines, suspension systems, and heavy machinery components. These bolts ensure high strength performance and reduced maintenance under continuous mechanical stress.
Marine & Offshore
Ideal for ships, docks, and offshore platforms. Stainless steel bolts offer excellent resistance to saltwater corrosion, humidity, and harsh marine conditions, ensuring long-term durability.
Construction & Infrastructure
Commonly applied in steel structures, bridges, and buildings. They provide strong load-bearing performance and long-term anti-rust protection for structural safety.
Chemical & Petrochemical Industry
Suitable for refineries, chemical plants, and gas systems. These bolts withstand corrosive chemicals, high temperature, and pressure environments.
Food Processing & Pharmaceutical
Used in hygienic equipment and production systems. Stainless steel bolts ensure clean, non-contaminating, and safety-compliant fastening solutions.
Solar Energy Systems
Widely used in solar panel mounting structures and PV systems. They provide outdoor durability and long-term corrosion resistance under UV, rain, and temperature changes.
Precision Manufacturing & International Quality Standards
Welle Fasteners operates a full quality-controlled custom stainless steel bolts manufacturing system, ensuring every part meets strict international standards.
Our production and inspection system includes:
Compliance with DIN bolts, ISO bolts, ASTM bolts and ASME B18 standards
Full material traceability (Mill Test Certificate 3.1 / 3.2 available)
Mechanical testing: tensile strength, hardness, torque verification, salt spray test
Dimensional inspection with precision measurement equipment like thread gauge, CMM
Batch consistency control for OEM production runs
We ensure every custom fastener meets engineering-grade reliability for critical applications.
Frequently Asked Questions (FAQ)
What are stainless steel bolts used for?
They are widely used in construction, marine, automotive, machinery, and energy industries requiring corrosion resistance and strength.
What is the difference between 304 and 316 stainless steel bolts?
304 is suitable for general environments, while 316 offers superior corrosion resistance for marine and chemical applications.
Can you produce custom stainless steel bolts?
Yes, we support OEM manufacturing based on drawings or samples.
Do you provide material certificates?
Yes, Mill Test Certificates (EN 10204 3.1) are available upon request.
What is your delivery time?
Typically 2–6 weeks depending on order size and complexity.
Fast OEM SS Bolts Manufacturing with 30-Day Delivery Capability
Welle Fasteners supports fast and stable production for custom stainless steel Bolts and OEM components.
Our supply advantages include:
Engineering review from drawing stage before production
Rapid prototyping and sample manufacturing support
Mass production lead time within 30 days
Flexible MOQ for project-based procurement
Export-ready packaging for global shipment
We help procurement teams reduce supply chain risk while ensuring project timelines are met.
