A2-70 stainless steel flange nut

主要功能:
  • A2 (304 Stainless Steel): Offers good corrosion resistance, durability, and strength. Suitable for outdoor, marine, and chemical environments.
  • Flange Base: Integrated washer-like flange distributes load, reducing the need for a separate washer.
  • Serrated or Smooth Flange: Some versions have serrations under the flange to prevent loosening from vibrations.
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螺栓與螺帽的鎖緊與開口採用非標準設計,搭配
使用非標準工具來解決打開和緊固問題。一般而言,其他
wrenches cannot be inserted. In the appearance design of nuts and bolts, non-standard slotting,
開口或五角、七角、九角或客製化對應槽工具
起到了很好的防盜效果

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金屬。它是一種利用金屬在下列因素作用下產生塑性變形的加工方法
外力作用下,在模具的幫助下,重新分配和轉移金屬的體積,以形成
所需的零件或坯料。冷镦工艺最适合生产标准的
螺栓、螺絲、螺帽、鉚釘和銷等緊固件

A2-70 Stainless Steel Flange 堅果 – Complete Overview

1. Definition & Purpose

An A2-70 flange nut is a stainless steel locking nut with an integrated wide circular flange at its base. It is designed to distribute clamping pressurereduce surface damage, and resist loosening under vibration.

The “A2-70” designation specifies:

  • A2: Austenitic stainless steel (Type 304 – 18% Cr, 8% Ni)

  • 70: Minimum tensile strength of 700 MPa (with a proof load of 450 MPa)


2. Material Properties

  • Corrosion Resistance: Excellent resistance to rust, water, and mild chemicals (suitable for outdoor, marine, and food-grade applications).

  • Temperature Range: Typically performs well between -200°C to +400°C (varies based on environment).

  • Magnetic Properties: Generally non-magnetic (but may become slightly magnetic after cold working).


3. Design Features

  • Flange Type:

    • Flat Flange (Smooth): Standard load distribution.

    • Serrated Flange: Teeth on the underside grip the surface, preventing loosening from vibration.

  • Thread Type: Metric (e.g., M6, M8, M10) or UNC/UNF (imperial).

  • Finish: Typically natural mill finish (bright, uncoated stainless steel), but may also be dull polished or electropolished for specific uses.


6. Common Applications

  • Automotive & Machinery: Engine components, exhaust systems, and vibrating equipment.

  • Plumbing & HVAC: Piping, valves, and fluid systems.

  • Marine & Offshore: Saltwater-resistant fastening.


8. Limitations

  • Not for Extreme Chloride Exposure (e.g., constant saltwater submersion – A4-70 is better).

  • Higher Cost than carbon steel or zinc-plated nuts.

  • Limited High-Temp Use – May lose strength above 400°C.


Conclusion

The A2-70 stainless steel flange nut is a high-strength, corrosion-resistant fastener ideal for applications requiring vibration resistance, load distribution, and durability.

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