Standard Nuts
Factory Direct for standard fasteners. Guaranteed quality with qc report and mill cert.Inch/metric available. Quick response with complete service.
Standardization in Industrial Fastening
The hexagonal nut is the most fundamental component in bolted joints, serving as the anchor that translates torque into clamping force. Our category of standard nuts is anchored by the ubiquitous DIN 934 hex nut, designed to mate perfectly with metric machine screws and bolts. These components are manufactured with precise internal threads (typically tolerance class 6H) to ensure smooth running during assembly and maximum load distribution when tightened. As a specialized nut supplier, we provide these in a wide range of strength classes, including Class 8 and Class 10 for steel, and A2-70 or A4-80 for stainless steel variants. This ensures that the nut is matched in strength to the bolt, preventing thread stripping under load.
Vibration Resistance Through Locking Mechanisms
In dynamic environments where machinery vibration can cause standard fasteners to back off, simple friction is often insufficient. Our inventory addresses this with specialized locknuts, prominently featuring the DIN 985 nylon insert nut. This design incorporates a captive polyamide ring at the top of the nut. When the bolt threads enter this ring, they deform the nylon elastically, creating a high-friction interference fit. This prevailing torque prevents the nut from loosening due to vibration or thermal cycling, effectively locking it in position without damaging the bolt threads. For applications requiring metal-on-metal locking, we also supply serrated flange nuts which use teeth on the bearing face to bite into the mating surface.
Material Durability and Environmental Protection
The longevity of a fastening system depends heavily on material selection. We specialize in the stainless steel nut category, offering grades A2 (304) for general outdoor use and A4 (316) for marine or chemical environments. The passivation process applied to our stainless nuts removes surface contaminants, enhancing the natural chromium oxide layer that protects against rust. For general indoor applications, we offer zinc-plated steel nuts that provide economical corrosion protection. By maintaining a vast stock of these materials, Screwtool ensures that whether you are assembling furniture or petrochemical piping, you have access to the correct metallurgical properties to prevent galvanic corrosion and seizure.
Advantages
Integrated Flange and Washer Functions
A key advantage in our product line is the availability of flange nuts, which integrate the function of a separate washer into the nut body. By widening the bearing surface, these nuts distribute the clamping load over a larger area, reducing the pressure on the workpiece and preventing damage to softer materials like aluminum or plastic. This integration significantly speeds up assembly lines by reducing the part count—operators only need to handle one component instead of two. As a nut supplier focused on efficiency, we offer these with smooth bases for surface protection or serrated bases for enhanced locking grip, providing versatile solutions for automotive and frame assembly.
Prevailing Torque Reliability
The engineering behind our nylon insert nut ensures consistent performance across repeated load cycles. Unlike chemical thread lockers which require curing time and cleaning, the nylon ring provides immediate locking action upon installation. This mechanical lock is resistant to leakage, oil, and various industrial solvents. Furthermore, the elasticity of the nylon allows for limited re-usability during maintenance, unlike deformed-thread locknuts which can damage the bolt upon removal. This reliability makes them the standard choice for safety-critical assemblies where maintaining preload is non-negotiable, offering a fail-safe against the loosening effects of shock and vibration.
Precision Cold Forging Technology
We manufacture our hex nut and stainless steel nut ranges using advanced cold forging technology. This process aligns the grain flow of the metal with the geometry of the nut, resulting in superior tensile strength and resistance to shear forces compared to machined parts. The precision of our tooling ensures that the flats of the hex are dimensionally consistent, providing a secure grip for wrenches and sockets without rounding off. This dimensional accuracy is critical for automated feeding systems in mass production environments, where a single out-of-spec nut can jam machinery and halt the production line.
Use Scenarios
Solar Panel Installation Projects
A Solar Energy Project Manager oversees the installation of photovoltaic arrays in coastal regions. The saline atmosphere necessitates hardware with high corrosion resistance. The manager specifies Screwtool’s M8 and M10 stainless steel nut (Grade A4-80) to secure the aluminum racking systems. The choice of A4 grade ensures that the nuts do not rust and seize onto the bolts over the 20-year lifespan of the installation. For the panel clamps, the manager utilizes our nylon insert nut to prevent the wind-induced vibration from loosening the clamps, ensuring the panels remain securely attached during storm events.
Heavy Machinery Assembly
In the production of agricultural harvesters, an Assembly Line Lead deals with equipment subject to intense engine vibration and rough terrain. To secure the engine mounts and chassis brackets, the lead opts for high-tensile steel locknuts. Specifically, the use of DIN 985 nylon insert nut fasteners ensures that the critical bolted joints maintain their torque specifications despite the constant shaking. By sourcing these in bulk from a reliable nut supplier, the factory maintains a steady flow of consumables, ensuring that every harvester leaving the line meets strict safety and durability standards.
General Construction and Steel Structures
A Structural Engineer designing a steel warehouse frame requires reliable fastening for the beam-to-column connections. The engineer selects high-strength Class 10 hex nut fasteners to pair with structural bolts. The precision threading ensures that the nuts can be tightened to the required pre-load using impact wrenches without stripping. In areas where the connection might be subject to dynamic loads from overhead cranes, the engineer supplements the design with our nuts featuring serrated flanges, eliminating the need for separate lock washers and speeding up the erection process of the steel framework.
About Us
Shanghai Screwtool Industrial Co., Ltd. is a dedicated manufacturer and global distributor of industrial fasteners, established in 2011 as a subsidiary of the Victor Screw Group. We bridge the gap between China’s manufacturing efficiency and international quality standards. While we produce a wide variety of screws, our expertise extends deeply into the nuts category, including standard hex nut, locknuts, and specialized flange nuts. Our facilities in Lianyungang and Shanghai enable us to control the entire production process, from wire drawing to tapping and surface treatment. We are ISO 9001 certified and provide full traceability for our products, including Mill Test Certificates for our stainless steel nut series. We serve diverse industries such as construction, automotive, and renewable energy, offering factory-direct pricing and flexible logistics for orders ranging from pallet quantities to full container loads.
Call to Action
Contact our sales team now to secure your bulk order of standard and locking nuts!
FAQ
What is the difference between a standard hex nut and a heavy hex nut?
A standard hex nut (like DIN 933) is suitable for most general applications. A heavy hex nut has a slightly larger width across the flats and thickness, providing greater proof load strength for structural connections.
Can nylon insert locknuts be reused?
While a nylon insert nut can technically be removed and reinstalled, its locking ability diminishes with each use as the nylon ring wears. For critical safety applications, we recommend using a new nut after disassembly.
What is the temperature limit for nylon insert nuts?
The polyamide (nylon) ring in our locknuts is typically rated for operating temperatures up to 120°C (248°F). For higher temperatures, we recommend using all-metal locking nuts.
Do you supply nuts in imperial (inch) sizes?
Yes, while our standard catalog focuses on metric DIN/ISO sizes, as a flexible nut supplier, we can manufacture ANSI/ASME standard nuts in UNC and UNF threads upon request for bulk orders.
What grades of stainless steel nuts do you offer?
We primarily stock stainless steel nut products in A2-70 (304) and A4-80 (316). A4 is recommended for marine or highly corrosive environments, while A2 is suitable for general outdoor use.
