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:
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A2: Austenitic stainless steel (Type 304 – 18% Cr, 8% Ni)
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70: Minimum tensile strength of 700 MPa (with a proof load of 450 MPa)
2. Material Properties
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Corrosion Resistance: Excellent resistance to rust, water, and mild chemicals (suitable for outdoor, marine, and food-grade applications).
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Temperature Range: Typically performs well between -200°C to +400°C (varies based on environment).
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Magnetic Properties: Generally non-magnetic (but may become slightly magnetic after cold working).
3. Design Features
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Flange Type:
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Flat Flange (Smooth): Standard load distribution.
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Serrated Flange: Teeth on the underside grip the surface, preventing loosening from vibration.
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Thread Type: Metric (e.g., M6, M8, M10) or UNC/UNF (imperial).
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Finish: Typically natural mill finish (bright, uncoated stainless steel), but may also be dull polished or electropolished for specific uses.
6. Common Applications
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Automotive & Machinery: Engine components, exhaust systems, and vibrating equipment.
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Plumbing & HVAC: Piping, valves, and fluid systems.
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Marine & Offshore: Saltwater-resistant fastening.
8. Limitations
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Not for Extreme Chloride Exposure (e.g., constant saltwater submersion – A4-70 is better).
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Higher Cost than carbon steel or zinc-plated nuts.
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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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