Jam Nuts Grade 5 Hex Thin Nuts ISO 4035 Standard Locking Applications
Manufacturing standard：ISO, GB, JIS, DIN, BS and ANSI standards, or drawings provided by customers.
Materials： iron, carbon steel, alloy steel, copper, stainless steel, plastics, high-temperature alloy, copper alloy, nickel-base alloy, high-strength alloy, corrosion-resistant alloy, etc.
Process： cold heading, punching, turning, milling, wire cutting, etc.
Treatment/Finishing: Brushing、Anodizing、Zinc Plated、Nickel Plated、Sn Plated.
Requirements： No Burrs、Scratches、Dents、Pits
Application： Structural Steel; Metal Building; Oil&Gas; Tower&Pole; Wind Energy; Mechanical Machine; Automobile: Home Decorating
Packing：bulk in cartons (25kg Max.)+wood Pallet or according to customer special demand
Jam nuts, often referred to as thin hex nuts, serve a critical function in mechanical assemblies where space constraints and vibration resistance are key concerns. Unlike standard full-height hex nuts, jam nuts are thinner and designed to be used in conjunction with another nut to create a locking mechanism that prevents loosening under dynamic loads. According to the ISO 4035 standard, jam nuts typically feature a reduced height and standard metric thread profiles, making them suitable for a wide range of industrial and structural applications.
When selecting jam nuts for high-performance applications, Grade 5 carbon steel and Grade 8 alloy steel are among the most common material choices. These grades ensure sufficient tensile strength while maintaining resistance to shear and stress fatigue. For enhanced corrosion resistance, many manufacturers offer zinc-plated or hot-dip galvanized finishes, particularly for outdoor or marine environments.
Jam nuts are often found in assemblies where axial space is limited. They are commonly used in combination with a primary fastening nut, such as a Grade 8 heavy hex nut, and installed in a locking configuration. In this application, the jam nut is typically torqued against the main nut to create a frictional lock, reducing the chances of vibration-induced loosening. This dual-nut arrangement is widely used in automotive suspension systems, machinery shafts, and heavy equipment bolting assemblies.
Manufacturers and suppliers offering jam nuts conforming to ANSI B18.2.2 or DIN 439 ensure global compatibility, especially for OEMs and export markets. Common size ranges include M6 to M36 or 1/4″-20 to 1″-8 UNC, with coarse and fine thread options. These nuts are often produced with chamfered edges and a plain or serrated bearing surface, depending on application requirements.
