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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
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1 in stock
Super-precision angular contact ball bearing duplex pair, 30 x 62 x 16 mm each, 25° contact angle, medium preload, phenolic cage, 24,400 N dynamic.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM206WIDUM |
| GTIN | 087796074422 |
| Model | 3MM 206 WI CR DUM / 7206 A5/AC TR/TY P4/P4Y |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 30 mm |
| OD | 62 mm |
| Width | 16 mm |
| Material | Bearing Steel |
|---|---|
| Series | 200 |
| Preload | Medium |
| Base Number | 206 |
| Overall Width | 16 mm |
| Mpn Variants | 3MM206WI-DUM; 3MM206WICRDUM; 3MM-206-WI-CR-DUM; 3MM 206 WI CR DUM |
| Precision Class | ABEC 7/9 / P4S |
| Closure Type | Open |
| Dynamic Load Rating | 24,400 N |
| Static Load Rating | 14,000 N |
| Rolling Elements | Ball |
| Cage Material | Phenolic |
| Number Of Rows | 2 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Limiting Speed | 24,700 rpm grease; 45,200 rpm oil |
| Internal Clearance | N/A |
| Harmonization Code | 8482.10.50.68 |
| Contact Angle | 25° |
| Mounting Arrangement | Duplex matched pair |
| Bearing Material | Bearing Steel |
| Cross Reference 1 | 7206 A5 (30 x 62 x 16 mm, 25°) |
|---|---|
| Cross Reference 2 | SKF 7206 ACD/P4A |
| Cross Reference 3 | FAG B7206-E-T-P4S |
| Cross Reference 4 | NSK 7206A5TRDUMP4 |
| Cross Reference 5 | NTN 7206 UADG/GNP4 |
| Cross Reference 6 | Fafnir 2MM206WI-CR-DUM (related, 15° contact angle on the same envelope) |
Fafnir 3MM206WI-CR-DUM super-precision angular contact ball bearing, supplied as a matched duplex pair. Bore Diameter: 30 mm. Outside Diameter: 62 mm. Overall Width: 16 mm per bearing. Series: 200WI. Base Number: 206. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. GTIN: 087796074422. The 206 size code is the ISO 7206 envelope.
3MM — Contact Angle: 25°, in Timken’s MM super-precision spindle range.
MM — Precision Class: ABEC 7/9 (P4S).
206 — the 30 mm bore size in the 200 medium series, on ISO 7206 boundary dimensions.
WI — low shoulder on both rings.
CR — Cage Material: Phenolic.
DU — Mounting Arrangement: duplex, two bearings ground as one matched set.
M — Preload: Medium.
Dynamic Load Rating: 24,400 N. Static Load Rating: 14,000 N. Contact Angle: 25°. The 200 medium series puts a heavier ball complement in a larger section than the 9100 light series at the same bore, which is where the higher ratings come from.
Limiting Speed: 24,700 rpm grease; 45,200 rpm oil. Preload: Medium. Precision Class: ABEC 7/9. Medium preload raises axial and radial stiffness above the light setting at the cost of some speed headroom and more heat.
Shaft backing shoulder diameter 36.5 mm. Housing backing shoulder diameter 56 mm. Maximum housing fillet radius 1 mm. The straight bore seats on a ground spindle journal, and the universally ground faces set the preload when the clamp nut is tightened.
Unit Quantity: 2 Pcs. Number Of Rows: 2. Two bearings ship as one factory-matched DUM set.
The 30 x 62 x 16 mm envelope at 25° is the ISO 7206 A5 size, so a 25° super-precision 7206 duplex set from another maker fits the same seat. The Fafnir 2MM206WI-CR-DUM shares the envelope at 15° and is listed as a related angle rather than an interchange.
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