A silicone grease composition is disclosed. The grease composition contains a silicone oil and zinc dialkyldithiocarbamate as an extreme-pressure additive. The grease composition contains substantially no zinc dialkyldithiophosphate. The grease composition achieves high friction characteristics and wear characteristics. A method for transmitting torque of a clutch or a torque limiter mechanism is also disclosed. Moreover, a method for producing a clutch or a torque limiter mechanism is disclosed. The methods utilize the aforementioned grease composition.

A solid-state lubricant composition is disclosed. The solid-lubricant contains graphene, an oxide of a metal, and one or more polymeric binders. A method of making a solid-state lubricant coating on various substrates is disclosed. The method includes the steps of making a homogeneous slurry comprising powder of an oxide of a metal, graphene, and a polymeric binder with organic volatile solvent; coating a substrate with the homogeneous slurry with desired thicknesses; and drying the slurry on the substrate naturally or applying additional heat, resulting in a solid lubricant coating on the substrate. Substrates with coated solid composite lubricant show wear reduction and lower coefficient of friction compared with uncoated substrates.

To provide a lubricating oil composition for a shock absorber, an additive for friction adjustment, a lubricating oil additive, a shock absorber, and a method for adjusting friction of a shock absorber lubricating oil, capable of achieving both operation stability and riding comfort. A lubricating oil composition for a shock absorber contains a base oil and a friction adjusting agent, in which the friction adjusting agent contains zinc dithiophosphate and pentaerythritol.

An oil-well metal pipe according to the present disclosure has a pipe main body including a first end portion and a second end portion. The pipe main body includes a pin formed at the first end portion, and a box formed at the second end portion. The pin includes a pin contact surface including an external thread part, and the box includes a box contact surface including an internal thread part. The oil-well metal pipe according to the present disclosure also includes a resin coating containing a resin, a solid lubricant powder, and copper phthalocyanine on or above at least one of the pin contact surface and the box contact surface.

The disclosed technology relates to an automotive or industrial gear oil for automotive or industrial gears, as well as axles and bearings, the automotive or industrial gear oil containing an oil of lubricating viscosity, an optional phosphate and/or thiophosphate compound, a particular sulfurized olefin, and a metal thiophosphate compound, such as zinc dialkyldithiophosphate, as well as a method of improving automotive or industrial gear operating efficiency and temperature by lubricating such automotive or industrial gears with the automotive or industrial gear oil.

A substantially zinc-free hydraulic fluid is provided. The substantially zinc-free hydraulic fluid contains a calcium detergent, an ashless antioxidant, and a metal-free phosphorous containing anti-wear agent. In one embodiment, the fluid contains at least 90 weight percent of a base oil having less than 500 ppm sulfur, a calcium detergent in an amount to deliver 5 ppm to 200 ppm calcium to the fluid, at least one metal-free phosphorus containing anti-wear agent to provide 10 ppm to 150 ppm phosphorous, and one or more ashless antioxidants. A method of lubricating a hydraulic system with the substantially zinc-free fluid is also provided.

A grease composition for a constant-velocity joint includes: (a) a base oil having a kinematic viscosity of 16.0 mm.sup.2/s or more at 100 C. and a viscosity index of 90 or more; (b) a diurea-based thickener, for example, an aliphatic diurea; (c) 0.2 to 2.0% by mass of zinc dialkyldithiophosphate; (d) 0.5 to 2.0% by mass of non-oil-soluble molybdenum dialkyl dithiocarbamate; (e) 0.5 to 3.0% by mass of oil-soluble molybdenum dialkyl dithiocarbamate; (f) 1.0 to 4.0% by mass of zinc dialkyldithiocarbamate; and (g) 0.1 to 1.5% by mass of a benzothiazole-thione or a derivative thereof, wherein (f):(g)=8:1 to 3:1 (mass ratio).

The disclosed technology relates to a lubricant composition for automotive or industrial gears, as well as axles and bearings, the automotive or industrial gear oil containing an oil of lubricating viscosity, an optional phosphate and/or thiophosphate compound, a particular sulfurized olefin, either a metal thiophosphate compound, such as zinc dialkyldithiophosphate, a thiadiazole functionalized dispersant, or a mixture thereof, and a hydroxyl/amine containing booster, as well as a method of improving automotive or industrial gear operating efficiency and temperature by lubricating such automotive or industrial gears with the automotive or industrial gear oil.