Square nut

Product Overview

A square nut is a four-sided fastener characterized by its square-shaped head and internal threads. Unlike standard hex nuts, the square design provides a larger surface contact area and a more substantial grip for wrenches, making it an excellent choice for applications requiring high torque and resistance to loosening under vibration. Constructed from durable carbon steel, these nuts offer a superior balance of strength, wear resistance, and cost-effectiveness for a wide range of industrial and structural applications

Material & Specifications

Our carbon steel square nuts are precision-engineered to meet rigorous industry standards. Key specifications include:

Material: High-strength 1018 Carbon Steel is a common grade, offering excellent machinability and toughness for general engineering applications. Low carbon steel options are also available for applications requiring good formability and weldability.

Strength Grades: Available in various property classes to suit different load requirements, including Class 5, Grade 6, and Grade 8. Hardness levels can reach HV 350-450 for high-strength applications.

Standards Compliance: Manufactured in accordance with major international standards to ensure dimensional accuracy and interchangeability, including:

DIN 557: The primary standard for square nuts.

ASME B18.2.2: The American National Standard for inch-series square nuts.

SAE J104: Standard for square and hex nuts used in automotive and industrial equipment.

GB 39-88: The Chinese national standard for square nuts.

Available Sizes:

Metric: Thread sizes range from M3 to M24 and larger.

Inch: Sizes such as 5/16"-18 are standard.

Thread Types: Available in both coarse and fine thread pitches to accommodate different bolt types and applications.

Surface Finishes: A variety of protective finishes are offered to enhance corrosion resistance and longevity:

Plain: An untreated, raw finish for general indoor use.

Zinc Plated: Provides a basic level of corrosion resistance and a bright, clean appearance.

Trivalent Bright Chromate Plating: Offers superior corrosion protection compared to standard zinc plating, with a bright, aesthetically pleasing finish.

Black Oxide Coating: Provides a mild level of corrosion resistance and a non-reflective, matte black finish.

Hot-Dip Galvanized: A heavy-duty coating for maximum corrosion resistance in harsh outdoor or marine environments.

Applications

The robust nature of carbon steel square nuts makes them indispensable across a diverse range of industries and applications:

Industrial Machinery: Ideal for securing components in heavy equipment, machine tools, and conveyor systems where vibration is common.

Structural & Construction: Used in metal buildings, bridges, and shipbuilding for creating solid, high-strength joints in steel structures.

Automotive: Employed in chassis assemblies, body panels, and other automotive components for reliable fastening.

Agriculture: Suitable for heavy-duty agricultural machinery and implements that endure high mechanical loads and tensile stresses.

General Engineering: A standard choice for fastening in applications requiring manual control, clamping, or locking actions.

T-Slot & Framing: Frequently used with T-slot nuts for quick and easy assembly of aluminum profiles, machine frames, and workstations.

Standards & Compliance

We supply square nuts that conform to the following key standards: