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Interlocking couplings can be lubricated with oil or grease. When lubricating with oil, attention should be paid to the injection of oil and sealing, as well as the provision of vent holes. For the selection of lubricant for this type of coupling, please refer to the information below. Specifications for selecting lubricants and greases for couplings: For double-ended toothed couplings, with a maximum circumferential speed of around 60 m/s, grease grade 0 or 1 should be used; the amount of grease applied should be enough to fill the coupling. The grease replacement interval is 6–12 months. It is required that the lubricant have good adhesion properties, and strict requirements are not imposed on sealing performance ； The maximum peripheral speed is approximately 60 m/s. It is lubricated with gear oils of grades N150 and N220, in an amount equal to half of the capacity of the coupling, to prevent oil leakage when at rest. The oil change interval is 12 months; strict sealing requirements are not applicable ； The maximum peripheral speed is approximately 150 m/s; it is lubricated with N150 or N220 gear oil, and a sufficient flow rate is required to flow continuously axially through the coupling, without any seals. Single-row toothed coupling: Maximum circumferential speed of about 60 m/s. It should be lubricated with grease of grade 0 or 1, in amounts sufficient to fill the coupling; the grease change interval is 6–12 months. The lubricant needs to have good adhesion properties, and strict requirements are not imposed on sealing performance ； The maximum peripheral speed is approximately 60 m/s. It is lubricated with gear oils of grades N150 and N220, in an amount equal to half of the capacity of the coupling, to prevent oil leakage when at rest. The oil change interval is 12 months; ordinary mineral oil is used, and strict requirements are not imposed on the sealing performance ； The maximum peripheral speed is approximately 30 m/s. It should be lubricated with grease of grade 0 or 1, in a quantity sufficient to fill the coupling; the grease change interval is 6 months. The lubricant is required to have good adhesiveness, and strict requirements are not imposed on sealing performance. Spline coupling: Maximum circumferential speed of about 150 m/s; lubricated with N150 or N220 gear oil, requiring a sufficient flow rate to pass continuously axially through the coupling, without any seals. Spring plate coupling: Maximum circumferential speed of about 30 m/s; lubricated with grease type No. 1 in an amount sufficient to fill the coupling, with a grease change interval of 1000 hours; low requirements regarding sealing. Disk spring coupling: Maximum circumferential speed of about 60 m/s. Lubricated with grease type 2 or 3, in an amount sufficient to fill the coupling; grease change interval is 12 months. No strict requirements regarding sealing are needed ； The maximum peripheral speed is approximately 150 m/s; it is lubricated with N150 or N220 gear oil, and a sufficient flow rate is required to pass continuously axially through the coupling. Cross-slider coupling: Maximum circumferential speed of about 30 m/s; lubricated with grease type No. 2, with the gap in the middle slider filled with grease; grease replacement interval is 1000 hours; ball bearing grease is suitable for use. The maximum peripheral speed is about 30 m/s; it is lubricated with N220 gear oil, and the gaps in the intermediate sliders are filled with oil. The oil change interval is 1000 hours, and sometimes felt gaskets soaked in oil are used. Roller chain coupling: Maximum circumferential speed of about 12.5 m/s; lubricated with grease type 1 or 2, with the grease filling the housing; grease replacement interval is 1000 hours; modest sealing requirements. The maximum peripheral speed is approximately 12.5 m/s; it is lubricated with N150 gear oil, the oil fills the housing, the oil change interval is 500 hours, and strict requirements are not imposed on sealing.