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Square nuts are four-sided threaded fasteners designed to provide enhanced grip, higher surface contact, and improved resistance to loosening under vibration. Widely used in heavy-duty assemblies, these fasteners are commonly manufactured in stainless steel, carbon steel, and alloy steel grades, complying with standards such as DIN 557, DIN 562, and ISO specifications. Their flat sides allow better wrench engagement and reduce rounding during installation, making them ideal for applications where frequent adjustments or high torque loads are expected.
In sectors such as construction, railways, electrical infrastructure, and machinery manufacturing, square nuts play a critical role in maintaining joint integrity. Their geometry distributes load more evenly across surfaces compared to hex nuts, especially in softer materials.
KK Fasteners supplies precision-engineered square nuts to global markets, ensuring consistent dimensional accuracy, certified materials, and reliable delivery across industrial supply chains.
| Parameter | Details |
|---|---|
| Material Variants | Stainless Steel (SS 304, SS 316, SS 316L), Carbon Steel, Alloy Steel |
| Grade Options | A2-70, A4-70, ASTM A194 Gr. 2H, Grade 8, Grade 10 |
| Size Range | M5 to M48 / 1/4” to 2” |
| Thread Type | Metric (ISO), UNC, UNF, BSW |
| Standards | DIN 557, DIN 562, ISO 4032, ASTM A563 |
| Surface Finish | Plain, Zinc Plated, Hot Dip Galvanized, Black Oxide, PTFE Coated |
| Type Variants | Standard Square Nuts, Heavy Square Nuts, Thin Square Nuts |
| Mechanical Properties | Tensile Strength: 400–1000 MPa (depending on grade) |
| Hardness | HRB 60–100 / HRC 20–35 (based on material grade) |
| Nut Size |
Nom. Diameter |
Width | Thickness | |
|---|---|---|---|---|
| Across Flats |
Across Corners |
Nom. | ||
| #0 | 0.0600 | 5/32 | 7/32 | 3/64 |
| #1 | 0.0730 | 5/32 | 7/32 | 3/64 |
| #2 | 0.0860 | 3/16 | 1/4 | 1/16 |
| #3 | 0.0990 | 3/16 | 1/4 | 1/16 |
| #4 | 0.1120 | 1/4 | 11/32 | 3/32 |
| #5 | 0.1250 | 5/16 | 27/64 | 7/64 |
| #6 | 0.1380 | 5/16 | 27/64 | 7/64 |
| #8 | 0.1640 | 11/32 | 15/32 | 1/8 |
| #10 | 0.1900 | 3/8 | 33/64 | 1/8 |
| #12 | 0.2160 | 7/16 | 19/32 | 5/32 |
| 1/4 | 0.2500 | 7/16 | 19/32 | 3/16 |
| 5/16 | 0.3125 | 9/16 | 49/64 | 7/32 |
| 3/8 | 0.3750 | 5/8 | 55/64 | 1/4 |
| Nut Size |
Width | Thickness | |
|---|---|---|---|
| Across Flats |
Across Corners |
Basic | |
| 1/4 | 7/16 | 19/32 | 7/32 |
| 5/16 | 9/16 | 49/64 | 17/64 |
| 3/8 | 5/8 | 27/32 | 21/64 |
| 7/16 | 3/4 | 1 1/64 | 3/8 |
| 1/2 | 13/16 | 1 3/32 | 7/16 |
| 5/8 | 1 | 1 23/64 | 35/64 |
| 3/4 | 1 1/8 | 1 17/32 | 21/32 |
| 7/8 | 1 5/16 | 1 25/32 | 49/64 |
| 1 | 1 1/2 | 2 3/64 | 7/8 |
| 1 1/8 | 1 11/16 | 2 19/64 | 1 |
| 1 1/4 | 1 7/8 | 2 9/16 | 1 3/32 |
| 1 3/8 | 2 1/16 | 2 13/16 | 1 13/64 |
| 1 1/2 | 2 1/4 | 3 1/16 | 1 5/16 |
Square nuts are widely used in applications where high grip strength, load distribution, and ease of adjustment are critical.
Square nuts are typically produced using cold forging or hot forging processes, followed by precision CNC threading to achieve accurate pitch and dimensional consistency. Heat treatment processes are applied where required to enhance mechanical strength and durability.
Quality control includes thread gauge inspection, dimensional verification using calibrated instruments, hardness testing, and coating thickness measurement. Each batch is traceable through material test certificates and inspection reports.
At KK Fasteners, production follows ISO 9001-certified processes with strict adherence to international standards, ensuring consistency across bulk orders and critical applications.
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Square nuts are four-sided threaded fasteners designed to provide a larger contact surface and better grip during tightening. They are commonly used in structural and heavy-duty applications where resistance to loosening and ease of installation are important.
Stainless steel grades like SS 304 and SS 316 are widely used for corrosion resistance, while alloy steel provides higher strength for load-bearing applications. Carbon steel is suitable for general-purpose use when combined with protective coatings like zinc plating.
Square nuts are typically manufactured according to DIN 557, DIN 562, ISO standards, and ASTM A563. These standards define dimensions, tolerances, threading, and mechanical properties to ensure compatibility and performance.
Selection depends on load requirements, environmental exposure, and compatibility with bolts. Stainless steel is ideal for corrosive environments, while alloy steel is preferred for high-strength structural applications.
Choose a supplier with ISO-certified manufacturing, material traceability, and consistent export experience. KK Fasteners supplies square nuts globally with documented quality checks and compliance with international standards.
Precision, consistency, and material reliability define the performance of square nuts in demanding applications. With controlled manufacturing processes and global distribution capability, KK Fasteners supports industrial buyers with dependable fastening solutions. For technical specifications, custom requirements, or bulk pricing, request a quote or connect with the engineering team to discuss your project needs.
