Rotary bellows suitable for high temperature environments. The excellent dynamic performance and extensive environmental adaptability of JM-65(J) series of seals are derived from advanced welded bellows technology. The 45°waveform design reduces stress peaks. and at the same time breaks down the stress of the inner hole welding mushroom to prevent early failure. And make the stress distribution more reasonable and better elasticity, so as to ensure good followability of the seal.