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Hex Bolts
Select Lift Capacity
1.5T
For Small Car
2.5T
For Truck
3.5T
Heavy Duty
$10.00
USD - per unit
Product Description
- These fasteners are high-precision mechanical components consisting of a hexagonal-headed bolt and a matching internal-thread nut, designed for secure joint fastening.
- The A2-70 designation is a technical shorthand: “A2” identifies the material as a grade 304 austenitic stainless steel, while “70” represents a minimum tensile strength of 700 MPa (approximately 100,000 psi) achieved through cold-working.
- They are manufactured to strict international standards such as DIN 933 (full thread), DIN 931 (partial thread), and ISO 4017/4032, ensuring global interchangeability.
- Product Key Features:
- Superior Corrosion Resistance: The high chromium (18%) and nickel (8%) content enables the formation of a self-repairing oxide layer, protecting the assembly against oxidation in rural, urban, and mildly aggressive environments.
- Exceptional Toughness: Due to their austenitic structure, these fasteners maintain high impact resistance and toughness even in cryogenic (extremely low) temperatures without becoming brittle.
- Non-Magnetic Properties: In their annealed state, these fasteners are largely non-magnetic, making them ideal for sensitive electronic or medical equipment installations.
- Thermal Stability: They exhibit good resistance to oxidation and scaling at elevated temperatures up to approximately 870°C, although continuous use in certain high-heat ranges may affect later corrosion resistance.
- Universal Compatibility: Available in a wide array of thread types, including Metric Coarse, UNC (Unified National Coarse), and UNF (Unified National Fine), to suit varied engineering requirements.
Product Features
Specification
- Material Composition: Composed primarily of 18% Chromium and 8-10% Nickel; trace amounts of manganese and silicon are included to enhance workability.
- Mechanical Strength: Features a minimum tensile strength of 700 MPa and a typical yield strength of approximately 450 MPa.
- Dimensional Range: Standard sizes in the Chinese market range from M1.6 to M100 in diameter, with lengths up to 800mm for specialized industrial use.
- Thread Precision: Precision-rolled threads ensure high torque consistency and reliable grip, minimizing the risk of thread stripping or loosening under vibration.
- Hardness: Typically ranges between 95 and 215 HB (Brinell Hardness), providing a durable surface that resists wear during installation.
Model Variations (By Material Grade):
Two primary material variations depending on the intended application and budget:
| Model | Alloy Series | Practical Value |
| SS 304 (A2-70) | 300 Series | The industry standard; offers the best balance of cost-efficiency and long-term durability in outdoor or moist environments. |
| SS 202 | 200 Series | A budget-friendly alternative; uses manganese and nitrogen to replace some nickel. Suitable for indoor or low-corrosion environments only. |
Ideal Use Cases:
A2-70 fasteners are most effective in environments where structural reliability must meet aesthetic longevity:
Food and Pharmaceutical Industry: Their non-contaminating surface and resistance to cleaning chemicals make them essential for food processing and medical machinery.
Construction and Infrastructure: Widely used in outdoor facades, railings, and solar panel mountings where exposure to rain and humidity is constant.
Automotive and Transportation: Ideal for chassis components and exterior trim that require high-strength fastening with a rust-free finish.
Marine and Water Treatment: Often utilized in coastal construction or water filtration facilities (for environments with low to moderate chloride exposure).
FAQ
Logistics & Transportation:
Products are shipped through certified logistics providers using Ground, Air, or Sea Freight, depending on the delivery location and fulfillment method. Each unit is securely packed to protect against damage during transit. Delivery timelines may vary due to carrier schedules, regional regulations, or customs clearance.
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