STAINLESS STEEL BOLTS
Company Profile
Shandong Boltec Metal Industry Co., Ltd. is a professional manufacturer specializing in stainless steel fasteners, with over 15 years of industry experience. We are committed to providing reliable, durable and cost-effective fastening solutions to global customers. Our stainless steel bolts are manufactured to the highest standards, ensuring superior performance in diverse applications.
Product Features
Superior Material Quality: Made from premium 304/316 stainless steel with excellent corrosion resistance and mechanical properties. Alternative grades such as 410 and Duplex are also available.
Precision Manufacturing: Advanced cold forging and CNC machining equipment ensures consistent thread accuracy, dimensional precision, and reliable performance.
Surface Finish Options: Passivation, Ruspert, Dacromet, Procote, and other surface treatments available to enhance corrosion resistance and extend service life.
Wide Product Range: Comprehensive offerings including Hex Head Bolts, Socket Head Cap Screws, Carriage Bolts, Eye Bolts, Anchor Bolts, and more.
Customization Capability: Flexible production to meet specific customer requirements for size, thread type, length, head style, and packaging.
More Information for Stainless Steel Bolts
| Item | Details |
| Standards | DIN 931 / DIN 933 / DIN 603 / DIN 444 / DIN 580, ISO 4014 / ISO 4017 / ISO 4018, ANSI / ASME B18.2.1, JIS B1180 |
| Material | Stainless Steel 304 (A2), 316 (A4), 410, 316L, Duplex 2205 |
| Property Classes | A2-70, A4-80, A2-50, A4-70 (A2-70 = 700 MPa tensile strength) |
| Head Types | Hex Head, Socket Head Cap (Allen), Countersunk, Button Head, Cup Head, Carriage, T-Head, Eye Bolt, U-Bolt, Hook Bolt |
| Drive Types | External Hex, Internal Hex, Slotted, Phillips, Pozidriv, Torx, Square |
| Thread Types | Fully Threaded, Partially Threaded, Fine Thread, Coarse Thread, Left Hand Thread |
| Thread Standards | Metric (Coarse / Fine), UNC, UNF, Whitworth |
| Size Range | M3 – M64 (Metric), 1/4" – 2" (Inch) |
| Length Range | 5mm – 500mm (Custom lengths available) |
| Surface Finish | Plain (Bright), Passivated, Polished, Ruspert, Dacromet, Procote, Zinc Plated, Hot Dip Galvanized |
| Customized Products | Lead Time: 30-50 days for busy season, 20-30 days for slack season (depending on complexity) |
| Standard Products | DIN/ISO norm products: 15-30 days |
| Packaging | Small box in carton, then Euro EPAL pallet / Color box / Bucket / DIY packaging upon customer demand |
Bolt Types Available
Hex Head Bolts
Description: The most common type of bolt, used for general purpose fastening
Standards: DIN 931 (partially threaded), DIN 933 (fully threaded), ISO 4014, ISO 4017
Applications: Construction, machinery assembly, structural connections
Socket Head Cap Screws
Description: Cylindrical head with internal hex drive for high-strength applications
Standards: DIN 912, ISO 4762
Applications: Machine parts, tooling, automotive components
Carriage Bolts
Description: Domed head with square neck to prevent rotation during tightening
Standards: DIN 603, ISO 8677
Applications: Wood connections, conveyor systems, construction
Eye Bolts
Description: Bolt with a circular ring head for lifting and rigging applications
Standards: DIN 580, DIN 444
Applications: Lifting equipment, rigging, marine hardware
Anchor Bolts
Description: Designed to fasten structures to concrete foundations
Standards: Custom specifications available
Applications: Construction foundations, column mounting, heavy equipment installation
U-Bolts
Description: Bent bolt in U-shape with threaded ends
Standards: DIN 3570, custom specifications
Applications: Pipe supports, leaf spring suspension, frame mounting
Why Choose Our Stainless Steel Bolts?
Certified Raw Materials: We source prime quality from major steel mills, ensuring material purity and traceability with mill test certificates
Full Traceability: Material grade markings on bolt heads for easy identification
100% Quality Inspection: Every batch undergoes dimensional inspection, hardness testing, and go/no-go gauge checks
Corrosion Resistance: Superior performance in harsh environments with salt spray testing available upon request
Global Standards Compliance: Manufactured to meet DIN, ISO, ANSI, and JIS specifications
Quality Assurance
ISO 9001:2015 certified quality management system
Strict raw material inspection with material certificates provided
100% dimensional and visual inspection before packaging
Third-party testing available upon request (SGS, BV, TUV)
Compliance with international standards: DIN, ISO, ANSI, JIS[Insert Product
FAQ – Stainless Steel Bolts
Q1: What is the difference between A2 and A4 stainless steel bolts?
A: A2 (304) is the standard grade for general applications with good corrosion resistance. A4 (316) contains molybdenum, providing superior resistance to corrosion in marine and chemical environments.
Q2: What does A2-70 or A4-80 mean on a bolt head?
A: The "A2" or "A4" indicates the material grade. The number (70 or 80) indicates the tensile strength in 100 MPa units. A2-70 = 700 MPa minimum tensile strength; A4-80 = 800 MPa minimum tensile strength.
Q3: Do you provide material certificates?
A: Yes, we can provide mill test reports and material certificates with every shipment upon request.
Q4: Can you produce custom head markings or logos?
A: Yes, we can customize bolt heads with your logo, grade markings, or other specifications.
Q5: How do I choose the right bolt length?
A: The general rule is that the threaded portion should extend through the nut with at least 1-2 threads visible after tightening. For custom applications, please consult our technical team.
Q6: What is your MOQ (Minimum Order Quantity)?
A: Our MOQ is generally 500 kg for standard products. For customized items, please contact us to discuss your requirements.
Q7: How do you prevent galling in stainless steel bolts?
A: We recommend using anti-seize lubricants during installation. For critical applications, we can provide bolts with special surface coatings to reduce galling risk.
Q8: Do you offer samples for testing?
A: Yes, samples are available upon request. Please contact our sales team for sample orders.
Applications
Construction & Architecture: Structural steel connections, handrails, curtain wall fixing
Marine & Offshore: Shipbuilding, dockside equipment, offshore platforms
Industrial Machinery: Equipment assembly, conveyor systems, machine tools
Automotive & Transportation: Vehicle assembly, trailer manufacturing, rail components
Renewable Energy: Solar panel mounting, wind turbine assembly
Food & Pharmaceutical: Hygiene-sensitive equipment requiring corrosion resistance
