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metric technical data conversions
IntroductionSelection Guide Engineering DataBrochure
Common Values Used in Fiberglide Catalog Converted to Metric Units from Imperial Units
Fiberglide Bearing Load Limits: |
| Static Pressure Limits (Constant) |
|
| Phenolic Backed: |
10,000 psi = 69 N/mm² |
|
| Steel Backed: |
30,000 psi = 207 N/mm² |
|
| Dynamic Pressure Limits (Oscillating) |
|
| Phenolic Backed: |
10,000 psi = 69 N/mm² |
|
| Steel Backed: |
20,000 psi = 138 N/mm² |
|
Velocity Limit: |
| Surface Speed Should be Kept Below 35 ft/min at 10,000 psi = 0.175 m/s at 69 N/mm² |
| or 600 ft/min at 100 psi = 3 m/s at 0.69 N/mm² |
PV Factor: |
| Max Continuous PV |
60,000 psi-ft/min = |
2.07 N/mm²-m/s |
|
| Max Intermittent PV |
150,000 psi-ft/min = |
5.175 N/mm²-m/s |
|
| Temperature Limit: |
|
Normal Operating Temperature Should Be Kept Below 300°F = 149°C |
Increased Wear Rates May Be Experienced Above 350°F = 177°C |
Consult TD Engineering Dept. When Temperature is Below -200°F = -129°C |
Mating Surfaces: |
| Surface Finishes |
8 µ in = 0.2 µ m |
|
|
16 µ in = 0.4 µ m |
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|
32 µ in = 0.8 µ m |
|
|
63 µ in =1.6 µ m |
|
Running Clearance: |
| Slight Interferrence Fit Recommended for Oscillating Motion |
.0005 in = .0127 mm |
|
| Free-Running Fit Recommended for Constant Rotation |
.0015 in/in of bearing ID = |
.0015 mm/mm of bearing ID |
Test Conditions: |
| Bearing ID |
1.00 in = 25.4 mm |
|
| Bearing Length |
0.50 in = 12.7 mm |
|
| Bearing Loads |
2,500 lb = 562.5 N |
|
|
5,000 lb = 1125 N |
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| Bearing Pressures |
5,000 psi = 34.5 N/mm² |
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|
10,000 psi = 69 N/mm² |
|
Fiberglide-Fabroid: |
| A Comparison of FIBERGLIDE and FABROID Bearings with Other
Self-Lubricating Types |
| |
Metal-Backed Fiberglide |
Metal-Backed Fabroid |
Filled PTFE |
PTFE Impreg-nated Bronze |
Oil Impreg-nated Bronze |
| Typ. Dynamic Load (psi) |
2,000 to 10,000 |
5,000 to
20,000 |
0 to 500 |
500 to 3,000 |
100 to 2,000 |
| Typ. Dynamic Load (N/mm²) |
13.8 to 69 |
34.5 to 138 |
0 to 3.45 |
3.45 to 20.7 |
0.69 to 13.8 |
| Max. Static Load (psi) |
30,000 |
60,000 1) |
2,500 |
20,000 |
11,000 |
| Max. Static Load (N/mm²) |
207 |
414 |
17.25 |
138 |
75.9 |
| Maximum PV Value (psi-ft/min) |
50,000 |
60,000 |
10,000 |
50,000 |
50,000 |
| Maximum PV Value (N/mm²-m/s) |
1.725 |
2.07 |
0.345 |
1.725 |
1.725 |
| Temperature Range (°F) |
-320 to +300 |
-320 to +400 |
-400 to +500 |
-320 to +500 |
-65 to +250 |
| Temperature Range (°C) |
-196 to +149 |
-196 to +204 |
-240 to +260 |
-196 to +260 |
-54 to +121 |
| 1) For Low Speed Oscillating
Conditions-static loads over 30,000 psi (N/mm²) or dynamic loads over
20,000 psi (N/mm²) require metal backing of high strength stainless steel or
equivalent materials. |
Bearings-Installation: |
| Journal Bearings |
|
| Min. Housing Lead-in Chamfer |
.050 in = 1.27 mm |
|
| Min. Shaft Lead-in Chamfer |
.125 in = 3.175 mm |
|
| or |
|
| Min. Shaft Corner Radius |
.060 in = 1.524 mm |
|
| Thrust Bearings |
|
| |
Allowable Corner Radius of Stepped
Shafts Through ID of |
|
| FTS |
.015 in = .381 mm |
|
| LTD |
.030 in = .762 mm |
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General Formulas for Metric Conversion of All Imperial Units in Fiberglide Catalog
| Measurement |
Imperial Unit |
Conversion Factor |
Metric Unit |
| Distance |
in |
25.4 |
mm |
| Load (Force) |
lb |
0.225 |
N |
| Pressure |
psi |
0.0069 |
N/mm² = MPa |
| Temperature |
°F |
-32 x 5/9 |
°C |
| Projected Area |
in² |
645.16 |
mm² |
| Surface Velocity |
ft/min |
0.005 |
m/s |
| PV |
psi-ft/min |
3.45E-05 |
N/mm²-m/s |
| Surface Finish |
µ in |
0.025 |
µ m |
| Example: 5,000 psi x 0.0069 = 34.5 N/mm² |
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