Fingerstock
What Is Fingerstock?
Fingerstock, also known as EMI shielding gaskets or contact springs, is a precision-engineered conductive component used to establish reliable electrical contact and shield electromagnetic interference (EMI) between mating surfaces.
Manufactured from high-performance alloys such as beryllium copper (C17200) or phosphor bronze (C51000), fingerstock consists of flexible “fingers” that compress upon installation, creating a low-impedance path for current while blocking RF leakage typically from 10 MHz up to 40 GHz.
Key properties include:
Contact force: 50–500 g per finger
Plating options: gold, nickel, or tin for corrosion resistance
Temperature range: -55°C to +165°C
Designs comply with applicable EMI shielding guidelines, including MIL-G-83528, IEC 61000-4-3/6, and UL94V-0, ensuring reliable performance under high vibration, thermal cycling, and harsh environments.
Manufactured from high-performance alloys such as beryllium copper (C17200) or phosphor bronze (C51000), fingerstock consists of flexible “fingers” that compress upon installation, creating a low-impedance path for current while blocking RF leakage typically from 10 MHz up to 40 GHz.
Key properties include:
Contact force: 50–500 g per finger
Plating options: gold, nickel, or tin for corrosion resistance
Temperature range: -55°C to +165°C
Designs comply with applicable EMI shielding guidelines, including MIL-G-83528, IEC 61000-4-3/6, and UL94V-0, ensuring reliable performance under high vibration, thermal cycling, and harsh environments.
What Is Fingerstock Used For?
Fingerstock is critical in applications demanding robust EMI shielding and electrical continuity. In aerospace, it seals avionics bay doors against HIRF (High-Intensity Radiated Fields) per DO-160G, while military vehicles use it to EMP-harden communication systems (MIL-STD-188-125). 5G base stations deploy custom-shaped fingerstock to ground massive MIMO antenna panels, suppressing intermodulation distortion. Medical imaging equipment integrates it to isolate MRI magnet bores from RF noise (IEC 60601-1-2). Automotive electronics rely on fingerstock for grounding EV battery enclosures and shielding ADAS radar modules (ISO 11452-2). Data centers apply it to EMI-gasketed server racks, achieving <1Ω contact resistance under EIA-364-23 testing.
Types of Fingerstock
Fingerstock is categorized by geometric configurations and material adaptations. Multi-Finger Strip Designs feature staggered contact points for 360° shielding in waveguide flanges, with beryllium copper variants offering 1300MPa tensile strength for satellite payloads. Knurled Surface Profiles enhance grip on anodized aluminum chassis in telecom base stations. High-Temperature Alloys like nickel-silver (C77000) withstand 200°C in automotive turbocharger sensors. Custom-Formed Shapes include U-channel gaskets for PCB grounding and spiral-wound springs for rotating RF joints in radar systems. Plating-Specific Variants employ 0.8μm gold over nickel for aerospace moisture resistance (AMS 2424) or tin-zinc coatings for cost-sensitive IoT devices. Emerging innovations include graphene-coated fingerstock for 100GHz+ mmWave applications and additive-manufactured lattice structures optimizing contact density per ASTM B388.
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