304 stainless steel flange nut

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

冷镦加工是一种少切削或无切削的压力加工新工艺
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

304 Stainless Steel Flange 螺帽 – Complete Overview

1. Definition & Purpose

A 304 stainless steel flange nut is a hex nut with an integrated circular flange that acts as a built-in washer. It is made from Type 304 (A2) austenitic stainless steel, offering excellent corrosion resistance, durability, and moderate strength.

The “304” designation refers to its material composition (18% chromium, 8% nickel), while “flange” indicates its wide, load-distributing base.

2. Material Properties

• Corrosion Resistance:

  • Resists rust, oxidation, and mild chemicals.

  • Suitable for food processing, marine, and outdoor applications (but not constant saltwater exposure—316/A4 is better).

• Non-Magnetic (Mostly):

  • Generally non-magnetic but may become slightly magnetic after cold forming.

5. Standards & Compliance

• ISO 3506 (Stainless steel fastener mechanical properties).

• DIN 6923 (Metric serrated flange nuts).

• ASME B18.2.2 (Imperial flange nuts).

• FDA Compliance (For food-grade applications).

8. Limitations

• Not for Extreme Chloride Exposure (e.g., seawater immersion—choose 316/A4 instead).

• Lower Strength than high-grade alloy steel nuts.

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

Conclusion

The 304 stainless steel flange nut is a versatile, corrosion-resistant fastener ideal for moderate-strength applications where rust prevention and vibration resistance are key. It is widely used in automotive, construction, food processing, and plumbing.

For harsher environments (e.g., seawater, acids), consider 316/A4 stainless steel flange nuts.