Protect your marine and electrical assemblies from vibration and corrosion with our premium Phosphor Bronze Single Coil Square Spring Washers. Conforming to DIN 7980 standards, these washers feature a specialized square cross-section that provides superior locking tension compared to standard flat washers. Specifically engineered for use with brass and phosphor bronze fasteners, they are the ideal choice for high-moisture environments, naval engineering, and electrical conductivity applications.
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Pickup available at Bridgwater, Somerset
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When your project involves saltwater, chemicals, or electrical currents, standard steel washers simply won't cut it. Our Phosphor Bronze DIN 7980 Spring Washers are engineered for these specific, demanding environments. Phosphor bronze is a copper alloy renowned for its resilience, offering low friction, high fatigue strength, and—most importantly—superb resistance to corrosion. This makes these washers the standard choice for naval architecture, boat building, and offshore rigging where constant exposure to moisture is a given.
Beyond their material benefits, these washers are powerful mechanical locks. Designed with a square cross-section, they feature a split "single coil" geometry. As you tighten your bolt or nut, the washer is compressed flat, exerting a continuous reactive force against the fastener head. This "spring effect" absorbs shock and vibration, ensuring the assembly remains tight even under dynamic loads. The square edges also provide a slight bite into the bearing surface, further preventing the rotation that leads to loosening.
One of the most critical aspects of fastener assembly is avoiding galvanic corrosion—a process where dissimilar metals react and corrode when in contact. If you are using Brass or Bronze bolts, using a Stainless Steel or Zinc Plated washer can lead to premature failure. These Phosphor Bronze washers are the perfect mate for copper-based alloy fasteners, ensuring chemical stability and the longevity of your joint. Additionally, their non-magnetic nature makes them indispensable for electrical switchgear and sensitive instrumentation where magnetic interference must be avoided.
Phosphor Bronze is often chosen for two main reasons: compatibility with brass/bronze bolts to prevent galvanic corrosion, and for applications requiring non-magnetic properties (like in electronics or near compasses on boats), where even stainless steel can sometimes be slightly magnetic.
It is technically possible, but generally not recommended for wet environments due to galvanic corrosion risks. Phosphor Bronze washers are best paired with Brass, Silicon Bronze, or Phosphor Bronze fasteners to ensure the joint lasts.
The square wire profile is stiffer than a rectangular flat washer profile. This means it exerts more pressure when compressed and fits better under the heads of cylindrical screws (like cheese head or socket cap screws) without sticking out, providing a neat and secure lock.
Your one stop shop for engineering supplies and tooling, we stock brands like Beta Tools, Ambersil & Metabo
Electro South West Ltd
Unit V Wylds Road, Bridgwater, Somerset
TA6 4BH
Company No: 04680424
VAT No: 586115332
