Variable Frequency Drives (VFD) vs. Servo Drives: What’s the Difference and Which Do You Need?
Both variable frequency drives (VFDs) and servo drives control motor speed and torque. While they
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Single universally ground super-precision angular contact spindle bearing, 100x180x34 mm; 25° contact angle, light preload, ABEC 7/9 (P4S).
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM220WI SUL |
| Model | 3MM220 WI CR SUL 7220A |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 100 mm |
| OD | 180 mm |
| Width | 34 mm |
| Base Number | 220 (ISO 7220) |
|---|---|
| Industry Terms | spindle bearing; machine tool bearing; super precision angular contact bearing; universally ground bearing; ABEC 7 bearing; P4S bearing; 7220 angular contact bearing |
| Common Misspellings | Timkin 3MM220WI; Timpken; Fafner 3MM220WI; Fafnier; 3MM220WISUL; 3MM 220 WI SUL; 3mm220wisul; 7220 SUL |
| Application Types | Machine-tool spindles; precision grinders; high-speed boring and milling spindles; high-speed motion control |
| Total Width | 34 mm (1.3386 in) |
| Condition Note | Made In USA, New Old Stock |
| Bore Shaft Size | 100 mm (3.9370 in) |
| Mpn Variants | 3MM220WICRSUL; 7220E-T-P4S-SUL; 3MM220WI-SUL; 3MM220WISUL; 3MM-220-WI-SUL |
| Manufacturer Status | Legacy Fafnir Number (Timken Brand) |
| Compatible With Replaces | Timken 7220E-T-P4S-SUL; FAG B7220-E-T-P4S-UL (same 100x180x34 mm envelope, 25°, light preload, P4S class) |
| Arrangement Configuration | Single bearing, universally ground (SU); mountable singly or paired back-to-back (DB), face-to-face (DF) or tandem (DT) |
| Precision Class | ABEC 7/9 / P4S |
| Dynamic Load Rating C1 | 157.5 kN (35,400 lbf) |
| Additional Attributes | Dynamic rating (ISO 281, per row): 143.0 kN (32,200 lbf); Max shaft fillet radius: 2.1 mm (0.0827 in); Outer-ring 'to clear' radius: 2.1 mm (0.0827 in); Shaft backing shoulder diameter: 114.4 mm (4.5039 in); Housing backing shoulder diameter: 166 mm (6.5354 in); Cage material (Timken): MBR molded phenolic; Ball material: chrome steel |
| Material | Bearing Steel |
| Min Temp | -30 °C |
| Cage Type | Machined |
| Dynamic Load Rating | 157.5 kN (35,400 lbf) |
| Static Load Rating | 121.0 kN (27,200 lbf) |
| Precision Rating | ABEC 7/9 / P4S |
| Series | 7200 |
| Rolling Elements | Balls |
| Max Temp | 120 °C |
| Condition | New – Open box |
| Item Weight | 7.60 lbs |
| Cage Material | Phenolic |
| Limiting Speed | 7,900 rpm (grease) / 14,400 rpm (oil) |
| Number Of Rows | 1 (single) |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Lubricant | Oil Preservative |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Preload | Light (SUL) |
| Mounting Arrangement | Single universal (SU) |
| Design Units | Metric |
| Bearing Class | Super precision |
| Bearing Material | Chrome steel |
| Part Number | 3MM220WI SUL |
| Radial Static Load Capacity | 121.0 kN (27,200 lbf) |
| Overall Width | 34 mm (1.3386 in) |
| Running Accuracy | P4 |
| Cross Reference 1 | 7220E-T-P4S-SUL (Timken world part number) |
|---|---|
| Cross Reference 2 | 3MM220WICRSUL |
| Cross Reference 3 | FAG B7220-E-T-P4S-UL |
The Timken Fafnir 3MM220WI SUL is a super-precision angular contact ball bearing from the 200WI machine-tool spindle series, with a 100 mm bore, 180 mm outside diameter and 34 mm width (ISO 7220 envelope). It has a 25° contact angle, a molded phenolic outer-land-riding cage (Timken CR code), chrome-steel balls, ABEC 7/9 (ISO P4S) precision and a light factory preload. Per Timken, it is rated 157.5 kN (35,400 lbf) dynamic and 121.0 kN (27,200 lbf) static radial, with limiting speeds of 7,900 rpm (grease) and 14,400 rpm (oil). The SUL suffix denotes a single bearing that is universally ground, so it can run alone or be matched with another universally ground 3MM220WI back-to-back (DB), face-to-face (DF) or in tandem (DT) without custom flush grinding. Timken’s world part number is 7220E-T-P4S-SUL, and the FAG B7220-E-T-P4S-UL occupies the same envelope and precision class. Made in USA, new old stock; typical applications include machine-tool spindles, precision grinders, and high-speed boring and milling spindles.
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