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Central Surplus Bearing Finder
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
Availability:
2 in stock
Super-precision angular contact ball bearing, 60 x 110 x 22 mm, 25° contact angle, phenolic cage, matched duplex pair at medium preload. 2 Pcs.
List Price
$76.48
2 in stock
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| MFR / Brand | Fafnir |
|---|---|
| Model | 3 MM 212 WI CR DUM / ABEC7 / 7212-A5 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 60 mm |
| OD | 110 mm |
| Width | 22 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7200 |
| Lubricant | Oil |
| Base Number | 7212 |
| Industry Terms | Spindle bearing; super precision bearing; machine tool bearing; duplex pair; ABEC 7 angular contact |
| Common Misspellings | Fafner; Faffnir; Fanfir; 3MM212W1; 3MM212WIDUM |
| Application Types | Machine tool spindles; grinding spindles; high-speed gearboxes; precision rotary tables |
| Bore Shaft Size | 60 mm (2.362 in) |
| Mpn Variants | 3MM212WI-DUM; 3MM212WICRDUM; 3MM-212-WI-CR-DUM; 3MM212WI; 3MM 212 WI CR DUM |
| Manufacturer Status | Fafnir is the Timken super-precision line |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50.28 |
| Part Number | 3MM212WI-CR-DUM |
A Fafnir 3MM212WI-CR-DUM super-precision angular contact ball bearing, 60 mm bore by 110 mm outside diameter by 22 mm wide, supplied as a universally ground duplex pair set to medium preload. Fafnir is Timken’s super-precision spindle bearing line, and the WI family is its standard single-row angular contact spindle bearing. The ISO equivalent envelope is the 7212 size.
3 — the leading 3 in 3MM gives a 25° contact angle.
MM — P4 precision, ABEC 7 on dimensional and running tolerances.
212 — with no 9 ahead of the size block the bearing sits in the ISO 72 dimension series, and the bore code 212 gives 60 mm.
WI — the super-precision angular contact family.
CR — phenolic cage riding on the outer ring land.
DUM — duplex universally ground pair at medium preload.
A 25° contact angle carries more thrust and less speed than a 15° bearing of the same size, which makes this the choice where a spindle sees heavy axial cutting load rather than top rpm. The outer-land-riding phenolic cage is light, self-lubricating and quiet, and it is the reason super-precision spindle bearings run at the speeds they do; it also sets a practical temperature ceiling well below that of a brass cage. Medium preload sits between the light preload used for maximum speed and the heavy preload used for maximum stiffness.
2 Pcs, one matched duplex pair. Universally ground rings allow the pair to be mounted back-to-back, face-to-face or in tandem, with the preload established by the ground offsets rather than by shims.
Direct interchange requires the same 25° angle, the same P4 class and the same duplex medium preload: an NSK 7212A5 or an SKF 7212 ACD at P4A in a DUM-equivalent pair is the same specification. A 7212 in the 15° C or 40° B angle is a related size in the same envelope, not a substitution, because the load split between radial and axial changes with the angle. The Fafnir 2MM212WI is the 15° version of this same size.
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Rockwell’s own product page for the Kinetix 6000 is down
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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