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Super-precision angular contact ball bearing pair, 40 x 80 x 18 mm each, low shoulder both rings, phenolic cage, ABEC 7/9 tolerance class.
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$41.89
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| MFR / Brand | Fafnir |
|---|---|
| MPN | MM208WIDUX |
| Model | MM 208 WI DUX / 7208B T P4 |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 40 mm |
| OD | 80 mm |
| Width | 19 mm |
| Condition | New – Open box |
|---|---|
| Base Number | MM208WI |
| Total Width | 36 mm (pair) |
| Condition Note | Made In USA |
| Overall Width | 18 mm |
| Mpn Variants | MM208WIDUX; MM-208-WI-CR-DUX; MM-209-WI-CR-DUX; MM 208 WI CR DUX; MM208WICRDUX; 7208-B |
| Precision Class | ABEC 7/9 / P4S |
| Series | 200WI |
| Rolling Elements | Ball |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Internal Clearance | N/A |
| Mounting Arrangement | Universally ground duplex pair |
| Cross Reference 1 | FAG 7208-T-P4S-UL |
|---|---|
| Cross Reference 2 | SKF 7208 D/P4A |
| Cross Reference 3 | NSK 7208TRDUP4 |
| Cross Reference 4 | NTN 7208UG/GNP4 |
| Cross Reference 5 | RHP 7208TDUP4 |
| Cross Reference 6 | Koyo 7208 P4 DU |
Fafnir MM208WICRDUX, a super-precision angular contact ball bearing supplied as a universally ground duplex pair. Bore Diameter: 40 mm. Outside Diameter: 80 mm. Overall Width: 18 mm per bearing. Total Width: 36 mm mounted as a pair. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic. Precision Class: ABEC 7/9 / P4S. Series: 200WI. Base Number: MM208WI.
MM — Fafnir super-precision spindle range, ground to ABEC 7/9 (P4S) tolerances. A bare MM with no leading digit carries no contact-angle code, so the angle is taken from the carton, not from the prefix.
208 — 200 medium dimension series, bore code 08: a 40 mm bore in an 80 mm outside diameter, 18 mm wide, which is the ISO 7208 envelope.
WI — low shoulder on both rings.
CR — phenolic cage.
DU — duplex pair, universally ground. Either face can be brought together, so the pair mounts back-to-back, face-to-face or in tandem.
Precision Class: ABEC 7/9 / P4S holds bore, outside diameter and running accuracy to super-precision limits, which is what a grinding or milling spindle is built around. Cage Material: Phenolic, light and vibration-absorbing, which is what lets this construction run faster than a pressed-steel cage on the same envelope. Internal Clearance: N/A — a universally ground duplex set is clamped to a defined stiffness rather than run to a clearance.
Unit Quantity: 2 Pcs. One universally ground duplex pair. The 18 mm figure is the width of a single bearing; the pair occupies 36 mm of shaft length when clamped together.
The envelope is the ISO 7208 envelope, 40 x 80 x 18 mm, in a super-precision execution. A P4-class 7208 duplex pair from FAG, SKF, NSK, NTN, Koyo or RHP occupies the same seat; match the contact angle and preload grade off the carton of the bearing being replaced. Searchable variants include MM208WIDUX, MM-208-WI-CR-DUX, MM-209-WI-CR-DUX, MM 208 WI CR DUX and MM208WICRDUX.
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