High Precision Square Nuts China Factory | Leading DIN 557 DIN 562 Suppliers
Longze Square Nuts are high-precision, four-sided internal-thread fasteners engineered to meet rigorous international standards, including DIN 557 (Standard/Thick), DIN 562 (Thin/Flat), and ASME B18.2.2. Specifically designed for applications where rotational stability is critical, these nuts provide a significantly larger surface contact area than traditional hex nuts, ensuring superior load distribution and preventing loosening in high-vibration industrial environments.
Whether utilized in electrical enclosures, blind-hole installations, or heavy-duty railway infrastructure, our square nuts offer unmatched versatility. With a wide range of material options from high-strength carbon steel to corrosion-resistant stainless steel, Longze ensures that every fastener provides the exact mechanical properties required for your specific engineering challenge, from space-constrained electronics to marine-grade structural assembly.
Detailed Parameters
| Compliance Standards | DIN 557, DIN 562, ASME B18.2.2 | Metric Size Range | M2 to M24 |
|---|---|---|---|
| Imperial Size Range | 1/4" to 1-1/2" (UNC / UNF) | Property Classes | Class 5, Class 8 / SS A2-70, A4-80 |
| Available Materials | Carbon Steel, Stainless Steel (304/316) | Surface Finishes | Zinc, Black Oxide, HDG, Passivated |
| Thickness Types | Thick (DIN 557) & Thin (DIN 562) | Mechanical Testing | Rockwell Hardness (HRC) / Proof Load |
| Core Applications | T-Slot Channels, Electrical Panels, Rail | Certification | ISO 9001 Quality Management |
Key Advantages
Anti-Rotation Geometry
The square profile locks into channels or recesses, enabling secure one-sided bolt installation without needing a wrench.
Enhanced Surface Contact
Four flat sides provide a larger bearing area, distributing clamping loads evenly to prevent material indentation.
Vibration Resistance
Ideal for railway and heavy machinery, the geometry significantly reduces the risk of loosening under constant oscillation.
T-Slot Compatibility
Perfectly sized for aluminum profiles and steel channels, allowing for adjustable and flexible mounting points.
Versatile Thickness
Choose DIN 562 for slim electronics or DIN 557 for heavy-duty structural integrity and maximum thread engagement.
Global Standard Fit
Fully compliant with both Metric (DIN) and Imperial (ASME) specs for seamless international machinery integration.
Product Gallery
Management Platforms
ISO 9001 Quality Control
Strict adherence to ISO standards ensures perfect thread concentricity and perpendicularity.
Mechanical Verification
Every batch undergoes Rockwell HRC testing to verify proof loads for Class 8 specifications.
Surface Treatment Audit
Salt spray testing ensures coatings like HDG and Zinc meet hourly corrosion resistance targets.
Precision Engineering
Advanced cold-heading and threading processes to ensure dimensional accuracy across all sizes.
Export Logistics
Standardized 25kg export cartons with fumigation-free pallets for safe global shipping.
Customization Support
Expert technical recommendations on material and coating based on environmental exposure.
Material Performance Comparison
| Material Grade | Tensile Strength | Primary Application |
|---|---|---|
| Carbon Steel Class 5 | 500 MPa | General Hardware / Light Duty |
| Carbon Steel Class 8 | 800 MPa | Automotive / Heavy Industrial |
| Stainless Steel A2 (304) | 700 MPa | Food Grade / Outdoor Use |
| Stainless Steel A4 (316) | 800 MPa | Marine / Chemical Processing |
| HDG Coated Steel | Varies by Grade | Utility Poles / Infrastructure |
Frequently Asked Questions
Square nuts offer a larger surface area and an anti-rotational shape, making them far more secure in channels or recesses where a wrench cannot be used.
Yes, the DIN 562 (Thin Type) is specifically designed to fit into T-slots of standard aluminum extrusions, providing a cost-effective sliding fastening solution.
Hot-Dip Galvanized (HDG) is highly recommended for outdoor use, providing 500-1000h of salt spray resistance, making it ideal for utility poles and bridges.
DIN 557 is the standard "thick" type for heavy-duty loads, while DIN 562 is the "thin/flat" type used in space-constrained electronics or specific channels.
Yes, we manufacture square nuts according to ASME B18.2.2 standards, covering sizes from 1/4" to 1-1/2" in both UNC and UNF threads.
Stainless Steel A4 (316) is the best choice due to its superior acid and chloride resistance, ensuring longevity in harsh marine or chemical settings.
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