Fingerstock
What Is Fingerstock?
Fingerstock, also known as contact springs or EMI shielding gaskets, is a precision-engineered conductive component used to establish reliable electrical contact and electromagnetic interference (EMI) shielding between mating surfaces. Made from high-performance alloys like beryllium copper (C17200) or phosphor bronze (C51000), fingerstock features a series of flexible “fingers” that compress upon assembly, creating a low-impedance path for current flow while blocking RF leakage from 10MHz to 40GHz. Key properties include contact forces of 50–500g per finger, corrosion-resistant plating (gold, nickel, or tin), and temperature resilience from -55°C to +165°C. Designs adhere to MIL-DTL-83528 for military connectors and IEC 62341-5-3 for industrial EMI shielding, ensuring consistent performance in high-vibration or thermal cycling 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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