A2-70 Hex Nut

About A2-70 Hex Nut

The A2-70 Hex Nut is a high-quality, standard metric internal thread fastener engineered for everyday industrial and structural clamping. The alpha-numeric designation "A2-70" explicitly defines its material and mechanical properties under international standards like ISO 3506-1:

         "A2" indicates it is made from Grade 304 austenitic stainless steel (18% Chromium, 8% Nickel).

         "70" signifies a high minimum tensile strength of 700 MPa, achieved through precise cold-working.

Featuring a traditional six-sided profile, this nut pairs with matching A2-70 bolts or threaded rods to deliver exceptional torque retention and long-term atmospheric rust protection.

Key Features & Design

         Optimized Tensile Strength: The cold-hardened "70" property class ensures the internal threads resist stripping and deformation under high tightening torque.

         Six-Sided Driving Geometry: Designed with standard flat sides for stable tool engagement using metric spanners, sockets, or open wrenches.

         Excellent Atmospheric Protection: The A2 composition forms a self-healing surface layer that prevents rust and staining in moisture, outdoor environments, and fresh water.

         Clean Metallic Polish: Provides a bright, aesthetically pleasing finish that eliminates the need for flaky anti-corrosion plating or coatings.

Manufacturing & Dimensional Standards

A2-70 hex nuts are manufactured strictly to global metric dimensional specifications:

         ISO 4032: The modern international standard for regular hex nuts (Product Grades A and B).

         DIN 934: The classic, widely utilized German industrial standard for standard hex nuts.

         DIN 985 / ISO 10511: Nylon insert lock nut variant ("Nyloc") designed to prevent vibration loosening.

         Thread Fitting: Machined to standard metric coarse or metric fine thread pitches with a precision 6H internal thread tolerance class.

Mechanical Property Profile

         Material Matrix: Austenitic Stainless Steel (Type 304 / 18-8).

         Minimum Tensile Strength: 700 MPa (700 N/mm).

         Minimum Proof Load Stress: Matches the high tensile rating to guarantee structural safety under heavy preload clamping forces.

         Magnetic State: Non-magnetic in the raw annealed state, though it can develop slight magnetism after the cold-threading manufacturing process.

Target Applications & Industries

         Automotive & Transport Maintenance: Securing bracket mountings, protective shields, internal panels, and non-critical engine bay fixtures.

         Commercial Architecture & Construction: Assembling outdoor balustrades, glass canopy framing, structural signages, and urban street furniture.

         Food & Catering Hardware: Used in commercial kitchen assembly, processing conveyors, and refrigeration units due to hygienic, washable surfaces.

         Solar & Renewable Energy: Fastening solar PV panel racking clips, mounting structures, and inverter framing panels in outdoor fields.