| HARDWARE DATA AND TOLERANCES
SHAFT - SURFACE ROUGHNESS
The seal contact surface of a plunge ground shaft should be finished to a surface roughness of 8 to 20 µin Ra and be free from machining leads.
SHAFT MATERIAL AND HARDNESS
Seals perform best on heat treated steel. Good chrome-plated and nickel-plated surfaces ground before and after plating are acceptable. Unlubricated and abrasive environments require shafts hardened from 50 to 72 Rc maximum wear resistance. Most sealing applications will require a shaft hardness of 35 Rc minimum to resist wear. Shafts made from soft mild steels can be used in some applications. Consult EPM Technical Department fro further information.
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SHAFT LEAD-IN CHAMFER
The shaft should be provided with a lead-in chamfer with a diametral difference of d(1) - d(2) and be free from burrs, sharp corners or rough machining marks.
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d(1)
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d(1) - d(2) |
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Up to .375
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.060 Min.
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.375 to .750
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.080 Min.
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.750 to 1.188
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.100 Min.
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1.189 to 1.562
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.125 Min.
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1.563 to 2.000
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.150 Min.
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2.001 to 2.750
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.170 Min.
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2.751 to 3.750
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.190 Min.
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SEAL CROSS-SECTION CHART
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Shaft Diameter
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Minimum Radial
Cross Section
(d(3) - d(1))/2
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Minimum
Seal Width
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Bore Chamfer
(C(1))
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.250 - .750
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.188
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.200
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.050 / .065
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.751 - 1.250
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.200
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.200
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.050 / .065
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1.251 - 1.750
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.285
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.240
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.050 / .065
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1.751 - 2.250
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.285
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.240
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.050 / .065
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2.251 - 2.500
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.375
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.300
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.080 / .095
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BORE MATERIAL AND FINISH
Cast iron, steel, aluminum and other commonly used metallic and non-metallic materials like plastic are acceptable. A bore finish of approximately 63 in Ra or smoother should be maintained to assure proper sealing.
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BORE TOLERANCE CHART
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Bore Diameter
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Bore Tolerance
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Up to 3.000
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±.001
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3.001 to 6.000
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±.0015
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6.001 to 8.000
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±.002
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8.001 to 10.000
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±.0025
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SHAFT TOLERANCE CHART
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Shaft Diameter
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Shaft Tolerance
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Up to 4.000
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±.003
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4.001 to 6.000
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±.004
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6.001 to 10.000
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±.005
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10.001 and up
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±.006
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HARDWARE VARIATIONS |
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