Timken vs. SKF Bearings: The Difference Between Tier-1 Bearing Brands
When sourcing a replacement bearing, you will often find both Timken and SKF options for
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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 (unsealed) |
| ID | 100 mm |
| OD | 180 mm |
| Width | 34 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7200 |
| Condition | New – Open box |
| Lubricant | Oil Preservative |
| Preload | Light (SUL) |
| Radial Static Load Capacity | 121.0 kN (27,200 lbf) |
| Overall Width | 34 mm (1.3386 in) |
| Running Accuracy | P4 |
| 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 |
| 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 |
| Rolling Elements | Balls |
| Max Temp | 120 °C |
| 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 |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Mounting Arrangement | Single universal (SU) |
| Design Units | Metric |
| Bearing Class | Super precision |
| Bearing Material | Chrome steel |
| Part Number | 3MM220WI SUL |
| 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). Made in USA, new old stock.
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. The SUL suffix denotes a single bearing that is universally ground.
Dynamic radial rating: 157.5 kN (35,400 lbf), per Timken
Static radial rating: 121.0 kN (27,200 lbf)
Limiting speed: 7,900 rpm (grease), 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. Typical applications include machine-tool spindles, precision grinders, and high-speed boring and milling spindles.
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