FAQ – Stainless Steel Nuts
Q1: What is the difference between A2 and A4 stainless steel nuts?
A: A2 (304) is the standard grade for general applications. A4 (316) contains molybdenum, providing superior resistance to corrosion in marine and chemical environments.
Q2: What does A2-70 mean on a nut?
A: The "A2" indicates the material grade (304 stainless steel). The "70" indicates the proof load stress is 700 MPa (minimum).
Q3: How do nylon insert lock nuts work?
A: The nylon ring deforms elastically when the bolt is inserted, creating friction that resists loosening from vibration. They are reusable but may lose effectiveness after multiple installations.
Q4: Do I need to use a washer with a flange nut?
A: No, flange nuts have an integrated washer face that distributes clamping pressure, eliminating the need for a separate flat washer in most applications.
Q5: What is the difference between DIN 934 and ISO 4032 nuts?
A: They are very similar but have slight dimensional differences. ISO 4032 has slightly smaller width across flats for some sizes. Please specify which standard you require.
Q6: Can you supply left-hand thread nuts?
A: Yes, we can manufacture nuts with left-hand threads for special applications such as rotating machinery or specific safety requirements.
Q7: 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.
Q8: How do I prevent stainless steel nuts from galling?
A: Use anti-seize lubricant during installation, avoid high-speed power tools, and ensure threads are clean. For critical applications, consider using nuts from a different grade than the bolt (e.g., A4 bolt with A2 nut).
Q9: Do you offer samples?
A: Yes, samples are available upon request. Please contact our sales team for sample orders.
Applications
Construction & Architecture: Structural connections, handrail fastening, curtain wall systems
Marine & Offshore: Boat building, dockside equipment, offshore platform hardware
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
Furniture Manufacturing: Assembly fittings, T-nuts for wood products
STAINLESS STEEL THREADED RODS
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 threaded rods are manufactured to precision standards, offering versatility and strength for countless 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 2205 are also available.
Continuous Full Thread: Fully threaded along the entire length, allowing for cutting to custom sizes and use with nuts at any position.
Precision Rolling: Advanced thread rolling technology ensures consistent thread profile, smooth finish, and accurate pitch throughout the rod length.
Surface Finish Options: Passivation, Ruspert, Dacromet, Procote, Hot Dip Galvanizing, and other surface treatments available to enhance corrosion resistance.
Multiple Length Options: Available in standard lengths of 1m, 2m, 3m, or custom cut lengths to meet specific project requirements.
Customization Capability: Flexible production to meet specific requirements for diameter, thread type, length, and packaging.
More Information for Stainless Steel Threaded Rods
| Item | Details |
| Standards | DIN 975 / DIN 976, ASTM A582 / A276, ISO 888, ASME B18.31.1-1972 (Inch series) |
| Material | Stainless Steel 304 (A2), 316 (A4), 410, 316L, Duplex 2205, 17-4PH |
| Property Classes | A2-70, A4-80, A2-50, A4-70 (A2-70 = 700 MPa tensile strength) |
| Thread Types | Metric Coarse, Metric Fine, UNC, UNF, Left Hand Thread, ACME Thread |
| Diameter Range | M3 – M64 (Metric), 1/4" – 2" (Inch) |
| Standard Lengths | 1 Meter, 2 Meter, 3 Meter (Custom cut lengths available) |
| Tolerance | Thread tolerance 6g (medium fit) for metric, Class 2A for inch series |
| 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 | 15-30 days |
| Packaging | Bundled in plastic, then cartons or wooden cases / Euro EPAL pallet / Custom packaging upon demand |
Threaded Rod Types Available
By Material Grade
| Grade | Properties | Typical Applications |
| A2 (304) Stainless Steel | General purpose, good corrosion resistance, cost-effective | Indoor/outdoor construction, general industry |
| A4 (316) Stainless Steel | Contains molybdenum, superior resistance to chlorides and chemicals | Marine environments, chemical plants, food processing |
| 410 Stainless Steel | Martensitic, heat-treatable for higher hardness | High-temperature applications, valve stems |
| Duplex 2205 | High strength, excellent corrosion resistance, stress corrosion cracking resistance | Offshore oil & gas, desalination plants |
| 17-4PH | Precipitation hardening, very high strength | Aerospace, high-performance engineering |
By Thread Type
| Thread Type | Description | Common Applications |
| Metric Coarse (M) | Standard metric thread, good for general applications | General purpose fastening |
| Metric Fine (MF) | Finer pitch for better adjustment and vibration resistance | Automotive, precision machinery |
| UNC (Unified Coarse) | Standard inch thread for general applications | General purpose, construction |
| UNF (Unified Fine) | Finer inch thread for better adjustment | Aerospace, automotive |
| Left Hand Thread | Threads run opposite direction (counter-clockwise to tighten) | Rotating machinery, safety applications |
| ACME Thread | Trapezoidal thread form for linear motion | Lead screws, actuators, lifting mechanisms |
Why Choose Our Stainless Steel Threaded Rods?
100% Full Threading: Consistent threads from end to end, no unthreaded sections to limit versatility
Straightness Guarantee: Precision straightening ensures rods meet strict straightness tolerances for easy installation
Cut-to-Length Service: We can pre-cut rods to your specified lengths, saving time on-site
Bulk Packaging Options: Available in coils for small diameters or straight lengths for larger diameters
Traceability: Material heat numbers and certificates available upon request
Corrosion Resistance: Salt spray testing available to verify performance in harsh environments
Quality Assurance
ISO 9001:2015 certified quality management system Strict raw material inspection with mill test certificates provided Dimensional inspection including thread pitch diameter verification Straightness testing to ensure compliance with standards Mechanical property testing (tensile, proof load) available Third-party testing available upon request (SGS, BV, TUV)
Compliance with international standards: DIN, ISO, ASTM, ASME
Common Applications
| Industry | Applications |
| Construction | Suspension systems for ceilings and ductwork, foundation anchor bolts, concrete inserts, formwork ties |
| Plumbing & HVAC | Pipe hangers, support systems, trapeze assemblies, equipment mounting |
| Electrical | Cable tray supports, conduit hangers, bus bar supports, equipment racks |
| Marine | Dock hardware, boat lifts, offshore platform supports, rigging components |
| Industrial | Machine assembly, jigs and fixtures, conveyor systems, structural bracing |
| Renewable Energy | Solar panel mounting frames, wind turbine tower internals, hydroelectric equipment |
| Architectural | Tension rods for cable railings, decorative elements, structural ties |
Technical Information
Thread Dimensions (Metric Coarse - Select Sizes)
| Size | Thread Pitch (mm) | Root Diameter (mm) | Tensile Stress Area (mm²) | Proof Load (kN) - A2-70 |
| M6 | 1.0 | 4.77 | 20.1 | 14.1 |
| M8 | 1.25 | 6.47 | 36.6 | 25.6 |
| M10 | 1.5 | 8.16 | 58.0 | 40.6 |
| M12 | 1.75 | 9.85 | 84.3 | 59.0 |
| M16 | 2.0 | 13.55 | 157 | 109.9 |
| M20 | 2.5 | 16.93 | 245 | 171.5 |
| M24 | 3.0 | 20.32 | 353 | 247.1 |
| M30 | 3.5 | 25.71 | 561 | 392.7 |
Load Capacity Guidelines
A2-70 (304): 700 MPa minimum tensile strength, suitable for most general applications
A4-80 (316): 800 MPa minimum tensile strength, highest corrosion resistance and strength
Note: Actual working loads should consider safety factors appropriate for your application.
FAQ – Stainless Steel Threaded Rods
Q1: What is the difference between DIN 975 and DIN 976?
A: DIN 975 specifically refers to threaded rods with threads running the full length. DIN 976 covers studs which may have different thread lengths or end configurations. In practice, DIN 975 is the most common standard for fully threaded rods.
Q2: Can I cut threaded rods to custom lengths?
A: Yes, threaded rods can be easily cut to any desired length using a hacksaw, angle grinder, or bolt cutters. We also offer pre-cutting services for your convenience.
Q3: Do you provide matching nuts and washers?
A: Yes, we can supply compatible stainless steel nuts and washers in the same material grade to complete your fastening assembly.
Q4: What is the maximum length available?
A: For smaller diameters (up to M16), we can supply up to 6-meter lengths. For larger diameters, standard 3-meter lengths are typical. Please inquire for special requirements.
Q5: How do I choose between A2 and A4 stainless steel?
A: Choose A2 (304) for general indoor and outdoor applications. Choose A4 (316) for marine environments, areas with high chloride exposure, chemical plants, or food processing facilities.
Q6: What does "6g" thread tolerance mean?
A: 6g is the standard medium-fit thread tolerance for metric external threads. It provides a good balance between ease of assembly and strength of engagement.
Q7: Can you supply left-hand thread rods?
A: Yes, we can manufacture threaded rods with left-hand threads for specialized applications such as turnbuckles or rotating equipment.
Q8: What is your MOQ (Minimum Order Quantity)?
A: Our MOQ is generally 500 kg for standard diameters and lengths. For customized items, please contact us to discuss your requirements.
Q9: How should stainless steel threaded rods be stored?
A: Store in a dry, covered area to protect from contamination. Avoid contact with carbon steel tools or surfaces which can cause surface rust staining.
Q10: Do you offer certificates of conformity or material test reports?
A: Yes, we can provide mill test reports, material certificates, and certificates of conformity with every shipment upon request.
Installation Tips
Use Anti-Seize: Apply stainless steel anti-seize compound to threads to prevent galling during installation
Proper Tools: Use appropriate wrenches or sockets to avoid damaging threads
Clean Cuts: After cutting, deburr the cut end to prevent damage to nuts and injury
Support Length: For long vertical installations, provide adequate support to prevent bending
Thread Engagement: Ensure sufficient thread engagement with nuts (typically 1-2 threads showing)
