STAINLESS STEEL NUTS
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 nuts are precision-engineered to ensure secure mating with bolts and threaded rods in all 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 tapping equipment ensures consistent thread accuracy, proper fit, and reliable clamping force.
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 Nuts, Lock Nuts, Nylon Insert Lock Nuts, Wing Nuts, Cap Nuts, Flange Nuts, and more.
Customization Capability: Flibexle production to meet specific customer requirements for size, thread type, height, and packaging.
More Information for Stainless Steel Nuts
| Item | Details |
| Standards | DIN 934 / DIN 985 / DIN 982 / DIN 1587 / DIN 315 / DIN 6923, ISO 4032 / ISO 4035 / ISO 7040 / ISO 7041 / ISO 7042, ANSI/ASME B18.2.2, JIS B1181 |
| Material | Stainless Steel 304 (A2), 316 (A4), 410, 316L, Duplex 2205 |
| Property Classes | A2-70, A4-80 (A2-70 = 700 MPa proof load stress) |
| Thread Types | Metric Coarse, Metric Fine, UNC, UNF, Left Hand Thread |
| Size Range | M2 – M64 (Metric), #0 – 2" (Inch) |
| Height Options | Standard Height, Low Height (Thin Nuts), High Height |
| Surface Finish | Plain (Bright), Passivated, Polished, Ruspert, Dacromet, Procote, Zinc Plated |
| 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 |
Nut Types Available
Hex Nuts
| Type | Description | Standards |
| Standard Hex Nut | Most common type, 6-sided nut for general applications | DIN 934, ISO 4032 |
| Thin Hex Nut | Reduced height for limited space applications | DIN 439, ISO 4035 |
| Heavy Hex Nut | Thicker and wider for high-strength applications | DIN 6330, ASME B18.2.2 |
| Jam Nut | Low height nut used to lock another nut in place | DIN 936 |
Lock Nuts
| Type | Description | Standards |
| Nylon Insert Lock Nut | Nylon ring at top provides vibration resistance (Nyloc) | DIN 985, ISO 7040 |
| All Metal Lock Nut | Distorted thread design for high-temperature applications | DIN 980, ISO 7042 |
| K-Nut (Prevailing Torque) | Elliptical offset thread creates friction to prevent loosening | DIN 6925 |
Specialty Nuts
| Type | Description | Standards |
| Wing Nut | Two large wings for hand tightening, no tools required | DIN 315, ISO 4038 |
| Cap Nut (Dome Nut) | Closed end protects bolt threads and provides finished appearance | DIN 1587, ISO 4039 |
| Flange Nut | Integrated washer base distributes clamping pressure | DIN 6923, ISO 4161 |
| Coupling Nut | Long nut for joining two threaded rods together | DIN 6334 |
| Square Nut | 4-sided nut often used in wood or with square bolt necks | DIN 557, DIN 562 |
| T-Nut | Pronged nut for embedding in wood, also known as Blind Nut or Furniture Nut | DIN 1624 |
| Weld Nut | Designed to be welded directly onto metal surfaces | DIN 928, DIN 929 |
Why Choose Our Stainless Steel Nuts?
Perfect Thread Fit: Precision-tapped threads ensure smooth engagement with bolts without binding or galling
Consistent Hardness: Proper heat treatment ensures nuts achieve the correct property class for reliable performance
Full Traceability: Grade markings where applicable for easy identification
Corrosion Resistance: Superior performance in harsh environments with salt spray testing availabl
Galling Prevention: Advanced thread forming techniques reduce the risk of galling during installation
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 inspection including thread go/no-go gaugingProof load testing to verify mechanical properties
Third-party testing available upon request (SGS, BV, TUV)
Compliance with international standards: DIN, ISO, ANSI, JIS
Nut & Bolt Compatibility Guide
| Bolt Grade | Recommended Nut Grade | Application |
| A2-70 | A2-70 | General purpose indoor/outdoor |
| A4-80 | A4-80 | Marine and chemical environments |
| A2-50 | A2-50 | Low-strength applications |
| 410 | 410 | High-temperature applications |
Note: For optimal performance, nuts should generally match or exceed the bolt grade.
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
