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Material Selection
Shaft and Housing Recommendation
O-rings & Rubber Packing
1. SHAFT :
Seven parameters make the seal and shaft more compatible and assist in providing optimal seal performance.
  • Shaft Speed-Important factor in seal selection.
  • Temperature- For extreme temperatures, special compounds can be used.
  • Pressure- Where pressure above nominal press-fit, special seals should be used or pressure against sealing lip relieved.
  • Grinding-Rotating Shaft: plunge grinding is recommended. Reciprocating Shaft: centerless grinding is acceptable.
  • Shaft Hardness-Normally seals contact area of the shaft should be Rockwell C 45 minimum.
  • Shaft to Bore Misalignment: Fixed misalignment of center of shaft with bore center concentrates wear at one side of the seal which becomes more severe as speed increases.
  • Shaft Run-out-Run-out ( eccentricity or shaft whip ) should keep to absolute minimum creates difficult sealing problem.
* SHAFT DESIGN RECOMMENDATION :
The other major components of an oil seal are the metal case and garter spring.
SHAFT DIAMETER TOLERANCE
up to 4.000 shaft .003
4.00 1 to 6.00 shaft .004
6.001 to 10.000 shaft .005
Pressure Limits
Shaft speed-FPM Maximum Pressure-PSI
0-1000 7
1001-2000 5
2001 and Higher 3
Eccentricity Limits
Speed Range Max Misalignment Max Shaft Run-out
0-800RPM 0.015 in ECC 0.025 in TIR
800-2200RPM 0.010 in ECC 0.020 in TIR
2200-4200RPM 0.010 in ECC 0.015 in TIR
 
 
2. HOUSING BORE :
The different material of bores is to be recommended using in rubber covered and metal O.D seals as followe: Robber covered O.D: steel and cast iron, soft alloy, aluminum alloy, plastic or nylon.
Metal O.D : steel and cast iron
 
* BORE DESING RECOMMENDATION :
BORE CHAMFER :
To assist installation of the seal, a bore chamfer is necessary. If without or improper chamfer will distort seal case and will require more assembly force craving is our recommendation of the chamfer.
* BORE DIMENSIONAL TOLERANCES :
To assure proper fit of oil seals, the dimensions of bore are recommended within the tolerances listed below. TCK seals are made to satisfy tight size specifications. Seals O.D are normally. .004" to .010" (.10mm to .25mm) larger than the seal bore size.
BORE DIAMETER IN INCH SIZES
Bore Diameter Bore Tolerance Nominal Press-Fit O.D Tolerance Eccentricity
Metal O.D Rubber O.D Seal O.D Metal O.D Rubber O.D
up to 1.000 .001 +.004 +.006 .002 .005 .010
1.001 to 2.000 .001 +.004 +.007 .002 .005 .010
2.001 to 3.000 .001 +.004 +.008 .002 .008 .015
3.001 to 4.000 .0015 +.005 +.010 .002 .010 .020
4.001 to 6.000 .0015 +.005 +.010 -.002; +.003 .010 .020
6.001 to 8.000 .002 +.006 +.010 -.002; +.003 .012 .025
8.001 to 10.000 .002 +.008 +.010 -.002; +.004 .015 .030
10.001 to 20.000 .002 +.008 +.010 -.002; +.006 .020 .040
BORE DIAETER IN METRIC SIZES
Bore Diameter O.D Diameter Tolerance Eccentricity
Metal O.D Rubber O.D Metal O.D Rubber O.D
6.1~50 +0.10~+0.20 +0.15~+0.30 0.12 0.25
50.1~80 +0.13~+0.23 +0.20~+0.35 0.18 0.35
80.1~120 +0.15~+0.25 +0.20~+0.35 0.25 0.50
120.1~180 +0.18~+0.28 +0.25~+0.45 0.33 0.65
180.1~300 +0.20~+0.30 +0.25~+0.45 0.40 0.80
300.1~500 +0.23~+0.35 +0.30~+0.555s 0.50 1.00
1. Seal O.DThe average of minimum three measurements to be taken at equally spaced positions
2. Eccentricity-
The maximum variance between any of the readings used in determining seal O.D.
 
3. ROTARY SHAFT SEALS :
There are hundreds of different cross sectional shapes available today in rotary shaft seals. Although TCK has a variety of shapes tooled and availabe. We teach and use a tired and true method of evaluating the application data, step-by-step answering critical questions about what the seal must do, the parameters and conditions under which it must live and arriving at a generic definition of the seal required. Then we search the available shapes and tooled sizes to see if the right one exits. If it doesn't, we prepare to develop it for our customer.
 
4. TEFLON SEALS AND ENGINEERED COMPONENTS :
TCK is equipped to provide high volume, low cost Tteflon and Teflon blend components of consistent quality as well as short run and prototype quantities. Various production methods are available depending upon component geomerty, quantity, and material requirements. TCK has extensive experience in the design and fabrication of Teflon compounds used as seals ( valve seals, lip seals , face seals, shaft seal elements). We have an ever-increasing menu of Teflon blends available to either machine or mold any sha p e components you may need.
 
 
 
No.5-20, Sher-wei St., Sher-wei Village, Fuh Sing Hsiang, Changhwa, Taiwan
TEL:886-4-7762466FAX:886-4-7762366E-mail:,
 
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