When it comes to selecting fasteners for industrial and corrosive environments, A2-70 stainless steel is often the go-to material. Known for its excellent corrosion resistance and mechanical strength, A2-70 stainless steel offers reliable performance across various applications. However, in settings where environmental conditions are more aggressive (such as marine, offshore, or chemical processing environments), even this high-grade stainless steel can reach its limits. This is where PTFE-coated A2-70 stainless steel fasteners provide a distinct advantage, building on the strength of the base material while enhancing its resilience with a protective, low-friction coating.
A2-70 stainless steel fasteners are manufactured from an austenitic stainless steel alloy and typically used in general-purpose applications that require good corrosion resistance and strength. They are ideal for structural connections, machinery, and automotive assembly. While A2-70 performs well in mildly corrosive conditions, it is still susceptible to surface oxidation, galling, and seizing over time, particularly in salt-laden air or when exposed to moisture, acids, or alkaline substances. In applications requiring frequent disassembly or exposure to harsh environments, these limitations can lead to increased maintenance and reduced service life.
PTFE coated A2-70 fasteners, by contrast, combine the core benefits of stainless steel with the superior surface protection of Polytetrafluoroethylene. The PTFE coating acts as a non-stick, chemically inert barrier that prevents moisture, salt, and corrosive chemicals from penetrating the metal surface. This significantly enhances corrosion resistance, even in extreme environments. Additionally, the PTFE coating reduces the coefficient of friction, making fasteners easier to install and remove. This anti-galling property is particularly valuable in bolted joints where high torque or repeated adjustments are involved. The coated fasteners are also more resistant to UV degradation and thermal cycling, making them suitable for outdoor, marine, and offshore structures where exposure is constant.
The key difference between the two lies not in the strength of the fastener—both share the same A2-70 classification—but in their durability and performance under adverse conditions. PTFE-coated A2-70 fasteners are engineered for longevity in corrosive and high-maintenance environments, helping to reduce downtime, extend service intervals, and maintain safety-critical assemblies. While they may involve a slightly higher upfront cost, the long-term savings in maintenance and replacement more than compensate.
Choosing between A2-70 and PTFE coated A2-70 fasteners ultimately depends on the demands of the environment. For indoor or low-exposure applications, standard A2-70 fasteners remain a solid choice. However, for environments where corrosion, chemical exposure, or frequent handling are concerns, PTFE coated alternatives offer a smarter, more durable solution that enhances both performance and reliability.