FASTENERS • SEALING


FATIGUE LIFE 420 chrome stainless steel also provides enhanced fatigue life, an important consideration given that Coiled Spring Pins often function as dynamic elements within many applications. A unique characteristic of Coiled Spring Pins is that their flexibility after installation protects host holes and assemblies by dampening vibration and shock loading. For comparison, Coiled Pins


of the same duty (i.e. material thickness) produced from material of equal dimensions, were tested in the three standard materials: MBK – a standard duty, high carbon steel, plain finish; MCK – a standard duty, 420 chrome stainless steel, plain finish; and MDK – a standard duty, 300 series austenitic stainless steel, plain finish. Resultant trend lines demonstrate


420 chrome stainless steels superiority in fatigue when tested at increasing percentages of assigned minimum double shear strength.


Data for comparative purposes only – conditions in this test do not infer performance benchmarks in any application as varied load, host materials, hole size, and shear plane quality/clearance will impact performance


SUMMARY Coiled Spring Pins manufactured from 420 chrome stainless steel are an excellent material choice where high strength, moderate corrosion protection, and superior fatigue life are critical. Additional benefits to consider include cost/benefit relationship in performance applications, high-wear resistance, good tensile and creep strength at moderately elevated


temperatures, oxidation and erosion resistance, improved component cleanliness as compared to high carbon steel, and reduced potential for mixed product & debris compared to plated and coated carbon steel product. ●


Michael Pasko is Applications Engineer at Spirol International. www.spirol.com


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