Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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Matched duplex pair of super-precision angular contact ball bearings, 1-3/4 in bore, 3 in OD, 5/8 in wide. ABEC 7 / P4, heavy preload, inch series.
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$300.89
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Here are some other options that might fit your project — cross-referenced equivalents and similar parts we have in stock and ready to ship. Need help choosing? Call 585-295-7880.
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Super-Precision Angular Contact Ball Bearing Matched Pair - Straight Bore, 17 mm ID, 40 mm OD, 12 mm Width, Open, 25° Contact Angle, Light Preload, Machined Phenolic Cage.$93.59| MFR / Brand | Fafnir |
|---|---|
| MPN | MM9311WI-3DUH |
| Model | MM 9311 WI 3 DUH |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 1.7500 in (44.450 mm) |
| OD | 3.0000 in (76.200 mm) |
| Base Number | MM9311WI |
|---|---|
| Industry Terms | Super-precision angular contact bearing, Machine tool spindle bearing set, Matched duplex pair, Inch series spindle bearing |
| Application Types | Machine tool spindles, High-speed precision spindles, Grinding spindles |
| Overall Width | 0.6250 in (15.875 mm) |
| Mpn Variants | MM9311WI-3-DUH, MM-9311-WI-3-DUH, MM9311WI-3DUH, MM 9311 WI 3 DUH, MM9311WI3DUH, MM9311WI |
| Arrangement Configuration | Matched duplex pair, universally ground |
| Precision Class | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Preload | Heavy |
| Mounting Arrangement | Universal |
| Design Units | Inch |
| Bearing Material | Steel |
Fafnir MM9311WI-3 DUH matched duplex pair of super-precision angular contact ball bearings on an inch envelope. Bore Diameter: 1.7500 in (44.450 mm). Outside Diameter: 3.0000 in (76.200 mm). Overall Width: 0.6250 in (15.875 mm) per bearing. Precision Class: ABEC 7 / P4. Preload: Heavy. Unit Quantity: 2 Pcs.
MM — Timken/Fafnir super-precision class, ISO P4 / ABEC 7.
9311 — the Fafnir number for this inch envelope: 1-3/4 in bore, 3 in outside diameter, 5/8 in width.
WI — low shoulder on both rings, the ground duplex form.
DUH — duplex universally ground, heavy preload. The two bearings are ground as one matched pair and mount back-to-back, face-to-face or in tandem.
Preload: Heavy. A heavy preload raises axial and radial stiffness and holds running accuracy under load, and it raises running torque and operating temperature.
Mounting Arrangement: Universal. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Bore Type: Straight. Closure Type: Open. Bearing Material: Steel. Design Units: Inch.
Unit Quantity: 2 Pcs. Arrangement / Configuration: matched duplex pair, universally ground, heavy preload.
This is an inch-series envelope: 1-3/4 in bore, 3 in outside diameter, 5/8 in width. The interchange runs within the Fafnir/Timken MM9311WI inch range.
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Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
Tapered, cylindrical, and spherical roller bearings all solve the same basic problem, carrying more load
If you pulled a bearing off general industrial equipment at random, there’s a good chance
Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
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