A2-70 stainless steel flange nut

The fastening and opening of bolts and nuts adopts non-standard design, and the matching
non-standard tools are used to solve the opening and fastening problems. In general, other
wrenches cannot be inserted. In the appearance design of nuts and bolts, non-standard slotting,
opening or pentagonal, heptagonal, nine-corner or custom-made corresponding groove tools
have played a very good anti-theft effect

冷間圧造加工は、切削の少ない、あるいは切削を必要としない新しい圧造加工のひとつである。
金属。の作用による金属の塑性変形を利用した加工法である。
外力を受け、金型の助けを借りて、金属の体積を再分配し、移動させる。
必要な部品やブランクを製造します。冷間圧造工程は、標準的な
ボルト、ネジ、ナット、リベット、ピンなどの留め具。

A2-70 Stainless Steel Flange ナッツ – 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 pressure, reduce 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.