DP4 Specifications   DP4 bushings Metric Sizes				DP4 bearing, fibres and PTFE lined, steel backing, self lubricating dry bush  Sintered PTFE/Fibre and Bronze on Steel Backing, surface with copper-plating or tin-plating PTFE / Fibre + Bronze + Steel + Copper plating / tin-plating Features Suitable for dry running with a low coefficient of friction, low wear rate, good sliding characteristics, the transfer film created will protect the mating metal surface. Suitable for rotary and oscillating movement, high chemical resistance, lower absorption of water and reduced swelling. Also performs well with lubrication. Structures 1. PTFE/Fibre mixture thickness 0.01~0.03mm, provides an excellent initial transfer film, which effectively coats the mating surfaces of the bearing assembly, forming an oxide type solid lubricant film. 2. Sintered bronze powder thickness 0.20-0.35mm, provides Max. thermal conductivity away from the bearing surface, also serves as a reservoir for the PTFE-Fibre mixture. 3. Low-carbon steel, gives exceptionally high load carrying capacity, excellent heat dissipation. 4. Copper/Tin plating thickness 0.002mm, provides good corrosion resistance. Technical Data Physical and Mechanical Properties   Usage Maximum Operating Temperature Tmax 280 °C dry good Minimum Operating Temperature Tmin -200 °C oil lubricated very good Maximum Static Load Psta,max 250 N/mm2 grease lubricated good Maximum Dynamic Load Pdyn,max 140 N/mm2 water lubricated fair Maximum Sliding Speed V-dry 2.5 m/s process fluid lubricated good Maximum Sliding Speed V-oil lubricated 5 m/s   Maximum PV Factor-dry 1 N/mm2 * m/s Maximum PV Factor-oil lubricated 10 N/mm2 * m/s Coefficient of friction f-dry 0.04-0.25 - Coefficient of friction f-oil lubricated 0.02-0.08 - Typical Applications This material meets the demanding criteria for long life and trouble-free performance with or without lubrication. Automotive: tractors, combines, crop sprayers, earthmovers, graders and other construction, auto machines, specific uses in power steering cylinders, steering gear thrust washers, disc brakes, calipers and pistons, shock absorbers, governor linkage, windshield wiper motor, tilt gear assemblies... Business machines: photocopy machines, typewriters, mail sorters, postage meter systems, computer terminal printers and peripheral equipment, automatic printing devices, mail processing machinery... Hydraulics and valves: pumps including gear, rotary, water, axial piston, and other types, ball, butterfly, poppet steam, and other valves and valve trunnions... Home appliances: tape recorders, refrigerators, air conditioners, cleaners, polishers, sewing machines, ovens, dishwashers, clothes washing machines...And materials handling, marine engine, packaging, textile equipment, tools...etc. Other Standard DP4 Bearing Shapes
DP4 Bearings & DP4 Bushings         8075DP4 Bush |  87 x 85 x 75 mm   BS80DP4 | 81.25 x 120 x 85 x 109.75 mm   1715DP4 Bush | 17x19x15 mm   2525DP4 Bush | 25x28x25 mm                     0203DP4B | 2 x 3.5 x 3 mm   DP4 plates   4050DP4 Bearing | 40x43x50 mm   BB3026DP4 Bearing | 30x34xF42x26 mm                     WC25DP4 washer | 28x48x1.5 mm   BB3026DP4 Bearing | 30x34xF42x26 mm   WC25DP4 washer | 28x48x1.5 mm   2830DP4 Bearing | 28x32x30 mm

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