Nut

Overview of Our Nut Collection

Nuts are the counterpart to bolts and screws, providing the clamping force necessary to hold machinery and structures together. Our catalog encompasses a broad spectrum of types, including Hex Nuts for general fastening, Nyloc Nuts for vibration resistance, and Flange Nuts which distribute pressure over a wider area. We ensure that every nut we supply meets rigorous industrial standards for thread fit and proof load.

Material and Strength Grade Guide

To prevent thread stripping or assembly failure, the nut must always be equal to or stronger than the bolt it is paired with. Below is a guide to our primary material offerings and their strength classifications.

Material Type	Common Grades	Key Characteristic	Typical Application
Stainless Steel	A2 (304), A4 (316)	Excellent corrosion resistance; Non-magnetic (mostly).	Chemical processing, marine environments, outdoor fixtures.
High Tensile Steel	Class 8, Class 10	High proof load; heat-treated for strength.	Automotive suspension, structural steel beams, heavy machinery.
Mild Steel	Class 4	Ductile and cost-effective.	Light duty assembly, furniture, non-critical joints.

Quality Assurance and Documentation

Ensuring the proof load capability of a nut is essential for safety. We provide EN 10204 Type 3.1 Material Test Certificates (MTC) free of charge upon request. This documentation confirms the chemical composition and mechanical properties of the steel batch. Please be sure to specify if you require this certificate when placing your order. Third-party inspections are also available for an additional fee.

Industrial Applications

Our nuts are deployed across various demanding sectors. Stainless steel nuts are vital in the wastewater treatment and food & beverage industries where frequent washdowns occur. In contrast, Class 10 carbon steel nuts are the standard for heavy equipment manufacturing, ensuring that high-stress joints do not loosen under extreme loads.

Frequently Asked Questions

How do I match the nut grade to the bolt grade?

The rule of thumb is that the nut grade should be equal to or greater than the bolt grade. For example, if you are using a Grade 8.8 bolt, you should use a Class 8 (or Class 10) nut. Using a weaker nut (like Class 4) on a high-strength bolt can result in thread stripping, where the threads of the nut shear off before the bolt breaks.

What is the difference between a Nyloc nut and a standard nut?

A standard hex nut is free-spinning and relies purely on torque to stay tight. A Nyloc nut features a nylon insert at the top. When the bolt threads enter this nylon ring, it deforms elastically, creating friction that prevents the nut from loosening due to vibration. Note that Nyloc nuts are generally not reusable.

Why do stainless steel nuts sometimes seize (gall) during installation?

Thread galling, or "cold welding," is common with stainless steel fasteners due to friction removing the protective oxide layer. To prevent this, use a slower installation speed (avoid impact drivers) and apply an anti-seize lubricant. Ensuring the threads are clean and free of grit also helps reduce the risk.