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304 Stainless Steel Class 4.8 & 6.8 Screw Nut Set Hex Head Bolt Plain Finish Flat & Spring Washers
This hex head bolt set is manufactured from 304 stainless steel and supplied in property classes 4.8 and 6.8. It includes matching nuts, flat washers, and spring washers in a plain finish. The assembly offers reliable clamping force for general industrial fastening needs. Available in M4 to M16 diameters, this set is designed for applications ranging from food equipment to light structural assemblies, providing a complete solution for B2B procurement.
- Overview
- Recommended Products
- 304 Stainless Steel Material: Durable and corrosion-resistant for long-lasting performance.
- Hexagonal Design: Provides precise and secure fastening in various applications.
- Multi-Specification: Available in M4-M16 sizes, catering to diverse engineering needs.
- Flat & Spring Washers Included: Ensures optimal vibration damping and load distribution.
- Industrial Grade Standards: Meets high-quality manufacturing standards for reliability.
Food Processing and Canning Machinery: In food environments, where wash-downs and exposure to organic acids occur, the 304 stainless steel offers a clean surface that resists surface marking. These bolts are often used in guard rails, motor mounts, and support frames for conveyors. The plain finish avoids any coating-related contamination concerns.
Conveying Equipment: For systems moving goods, the vibration-damping characteristic of the spring washer helps to maintain tension on gearbox mounts and roller brackets. The flat washer serves to protect elongated holes in sheet metal frames from deformation under dynamic loads.
Medical Apparatus: In non-critical structural components of medical devices, such as equipment carts, adjustable arms, and housing assemblies, the corrosion resistance of 304 steel supports frequent cleaning with mild detergents. The complete set with washers provides balanced clamping without marking surfaces.
Packaging Machinery: The sealing and labeling sections of packaging lines benefit from the secure clamping provided by these sets. The plain finish avoids any flaking that could occur with plated finishes, which is relevant for maintaining clean operational zones in food-grade packaging.
Water Treatment Industry: For indoor water treatment plants, these fasteners are a practical choice for mounting pumps, valves, and control panels. Their resistance to humidity and occasional splashing supports operational reliability in moderately damp conditions.
Chemical Equipment: In areas handling weak chemicals or where fumes are present, these hex head bolts offer a serviceable fastening option. The full assembly, including washers, provides a balanced clamping solution for pipe supports and equipment stands.
General Machine Parts and Ship Manufacturing: As replacements for worn parts or in new assembly of auxiliary equipment, these fasteners are adaptable. The availability in M4-M16 sizes ensures a fit for a variety of mounting holes. In shipbuilding, they suit interior fittings where direct seawater exposure is not a primary concern, such as in cabin fixtures and electrical panel mounting.
About Products
This fastener set centers on a hex head bolt produced from 304 stainless steel, an 18-8 austenitic alloy widely specified for its combination of formability and resistance to oxidizing environments. The 304 grade offers a useful balance for indoor and light outdoor applications where exposure to corrosive elements is moderate. The product line includes two distinct property classes. Class 4.8 bolts are suitable for general-purpose connections where loads are moderate and structural requirements are straightforward. Class 6.8 bolts undergo a different processing route to achieve higher tensile strength, making them more appropriate for joints that experience increased stress or dynamic loading conditions.
The hexagonal head is designed to standard dimensional specifications, enabling efficient torque application with standard wrenches or sockets. This geometry reduces the chance of cam-out during installation. A key feature of this set is the inclusion of both flat and spring washers with every bolt and nut. The flat washer increases the bearing surface under the bolt head and nut, distributing the clamping load over a larger area. This helps maintain joint integrity, particularly when fastening into softer materials like aluminum or thin sheet metal. The spring washer, also known as a split lock washer, provides axial force that resists rotational movement. The plain finish is chosen for applications where a clean, passive surface is needed, or where subsequent painting or welding may occur. This set is supplied in a range of diameters, from M4 to M16, with lengths to suit varied material stack-ups. The threads are rolled rather than cut, which improves fatigue resistance by creating a continuous grain flow in the material. This manufacturing detail contributes to reliable performance in applications subject to cyclic loading.
Key Advantages
Application Scenarios
The versatility of these 304 stainless steel fasteners allows for deployment across a wide spectrum of industrial sectors:
