Our Products - Technical Information
PFI Bearings are manufactured according to relevant ABEC and DIN standards in effect on the date of manufacture.
High Strength Bearing Steel
We use AISI 52100 chrome steel in all inner rings, outer rings, and rolling elements, heat-treated to 60-65 HRC.
Accuracy
Our ball bearings are manufactured to ABEC 1 dimensional tolerances. ABEC 3 class bearings are also available by special order.
Dimensional Tolerances
Inner Ring (ABEC 1)
| Bore Diameter (mm) | Mean Bore Diameter Deviation (micrometers) | Single Width Deviation (micrometers) | |||
|---|---|---|---|---|---|
| Over | Incl. | High | Low | High | Low |
| 0.6 | 2.5 | 0 | -8 | 0 | -40 |
| 2.5 | 10 | 0 | -8 | 0 | -120 |
| 10 | 18 | 0 | -8 | 0 | -120 |
| 18 | 30 | 0 | -10 | 0 | -120 |
| 30 | 50 | 0 | -12 | 0 | -120 |
| 50 | 80 | 0 | -15 | 0 | -120 |
Outer Ring (ABEC 1)
| Bore Diameter (mm) | Mean Bore Diameter Deviation (micrometers) | Single Width Deviation (micrometers) | |||
|---|---|---|---|---|---|
| Over | Incl. | High | Low | High | Low |
| 2.6 | 6 | 0 | -8 | 0 | -40 |
| 6 | 18 | 0 | -8 | 0 | -120 |
| 18 | 30 | 0 | -9 | 0 | -120 |
| 30 | 50 | 0 | -11 | 0 | -120 |
| 50 | 80 | 0 | -13 | 0 | -120 |
| 80 | 120 | 0 | -15 | 0 | -150 |
Radial Internal Clearance
Our standard program consists of C3. Other radial tolerances are available by special order.
| Bore (mm) | C2 (µ) | C0 (µ) | C3 (µ) | C4 (µ) | C5 (µ) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Over | To | Low | High | Low | High | Low | High | Low | High | Low | High |
| 2.5 | 6 | 0 | 7 | 2 | 13 | 8 | 23 | 14 | 29 | 20 | 37 |
| 6 | 10 | 0 | 7 | 2 | 13 | 8 | 23 | 14 | 29 | 20 | 37 |
| 10 | 18 | 0 | 9 | 3 | 18 | 11 | 25 | 18 | 33 | 25 | 45 |
| 18 | 24 | 0 | 10 | 5 | 20 | 13 | 28 | 20 | 36 | 28 | 48 |
| 24 | 30 | 1 | 11 | 5 | 20 | 13 | 28 | 23 | 41 | 30 | 53 |
| 30 | 40 | 1 | 11 | 6 | 20 | 15 | 33 | 28 | 46 | 40 | 64 |
| 40 | 50 | 1 | 11 | 6 | 23 | 18 | 36 | 30 | 51 | 45 | 73 |
| 50 | 65 | 1 | 15 | 8 | 28 | 23 | 43 | 38 | 61 | 55 | 90 |
| 65 | 80 | 1 | 15 | 10 | 30 | 25 | 51 | 46 | 71 | 65 | 105 |
| 80 | 100 | 1 | 18 | 12 | 36 | 30 | 58 | 53 | 84 | 75 | 120 |
| 100 | 120 | 2 | 20 | 15 | 41 | 36 | 66 | 61 | 97 | 90 | 140 |
| 120 | 140 | 2 | 23 | 18 | 48 | 41 | 81 | 71 | 114 | 105 | 160 |
100% Noise and Vibration Testing
Every PFI ball bearing is electronically tested for noise and vibration according to ANSI/AFBMA Standard 13-1987. Our testing process allows us to check for unwanted noise in the full sound frequency range:
| Nominal Low Cut Off Frequency (Hz) | Nominal High Cut Off Frequency (Hz) | |
|---|---|---|
| Low Band | 50 | 300 |
| Medium Band | 300 | 1,800 |
| High Band | 1,800 | 10,000 |
Premium Greases
PFI Bearings are factory packed with premium greases like MOBIL POLYREX EM, EXXON RONEX MP (pdf file), and KYODO-YUSHI ET-K (pdf file), among others.
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