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391The use of computer numerical control machine tools and high-quality steel to produce the connecting sleeve to ensure the reliability and controllability of product quality. Thread model：R22，R25，R28，SSR28，R32，SSR32，R35，SSR35，R38
The use of computer numerical control machine tools and high-quality steel to produce the connecting sleeve to ensure the reliability and controllability of product quality.
Thread model：R22，R25，R28，SSR28，R32，SSR32，R35，SSR35，R38，T38，T45，T51
Bridge area type: half-bridge connecting sleeve, full bridge connecting sleeve
