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An important part of the oscillating mechanical drives are flexible shaft couplings. The special use of the pneumatic flexible coupling is possibility to serve as mechanical drives tuners. Being examined in tuners mechanical drives there is also a research focus on the impact of industrial gases on the change of dynamic characteristics of pneumatic couplings. The paper investigates five different industrial gases, namely: air, helium (He-4,6), a mixture of propane and butane gas (C₃H₈+C₄H₁₀), argon (Ar) and nitrogen (N₂) to see how these gases affect the dynamic characteristics of pneumatic flexible coupling.