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Availability:
16 in stock
Super-precision angular contact ball bearing set, 40 mm bore × 68 mm OD × 15 mm wide each, 25° contact angle, light preload, ABEC 7/9, sold as a matched triplex set of 3 pieces.
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$186.84
16 in stock
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM9108WITUL |
| Model | 3MM 9108 WI TUL ABEC7 / B7008E TPA P4 TUL / 7008A5 7008ACD |
| Bearing Type | Angular Contact Ball Bearing |
| Condition | New |
|---|---|
| Preload | Light (UL) |
| Base Number | 3MM9108WI |
| Industry Terms | spindle bearing, precision angular contact bearing, triplex set, matched set bearing, ABEC 7 bearing, super precision ball bearing, 7008 bearing |
| Common Misspellings | 3MM9108 WI TUL, 3MM9108WLTUL, 3M M9108WITUL, 3MM908WITUL, Fafnir 3MM 9018 WI TUL |
| Application Types | Machine tool spindles, milling and grinding heads, precision ballscrew supports, indexing tables, high-speed motorised spindles |
| Total Width | 45 mm (1.7717 in) across the triplex set |
| Bore Shaft Size | 40 mm (1.5748 in) |
| Mpn Variants | 3MM9108WI-TUL, 3MM9108WITUL, 3MM 9108 WI TUL, 3MM9108WI TUL, 3MM9108WICRTUL |
| Arrangement Configuration | Triplex (T), universally ground matched set |
| Precision Class | P4S (ABEC 7 dimensional / ABEC 9 running accuracy) |
| Number Of Rows | 1 per bearing, 3 in the set |
| Contact Angle | 25° |
| Design Units | Metric |
| Part Number | 3MM9108WI-TUL |
| Cross Reference 1 | FAG B7008-E-T-P4S-TUL |
|---|---|
| Cross Reference 2 | SKF 7008 CD/P4ATBTA |
| Cross Reference 3 | NSK 7008A5TRSUV3TL |
| Cross Reference 4 | RHP 7008ETTULP4 |
| Cross Reference 6 | 3MM9108WI-TUM (related size, medium preload) |
| Cross Reference 7 | 3MM9108WI-DUL (related size, duplex pair) |
A matched triplex set of super-precision angular contact ball bearings, 40 mm bore, 68 mm outside diameter, 15 mm width per bearing, with a 25° contact angle, ground faces and light preload across the set.
3MM — Fafnir super-precision series, 25° contact angle9108 — size code corresponding to the ISO 7008 envelope, 40 mm boreWI — ground-face style for matched mountingT — triplex, three bearings ground as one setUL — universal light preloadMM prefix — P4S accuracy, ABEC 7 dimensional with ABEC 9 running accuracy
A 25° contact angle carries more thrust and less speed than a 15° angle in the same envelope, which is what makes the 3MM series the choice for spindles with significant axial cutting load.
Three bearings ground as a triplex set share preload and load between them, giving higher axial and radial stiffness and higher combined capacity than a duplex pair of the same size. Light preload keeps heat generation and running torque at the low end of the preload range.
The WI ground-face style holds the ring faces flat and parallel so the set clamps up without shimming and reproduces the factory preload.
Three bearings, supplied as one matched triplex set. Combined width across the set is 45 mm. Open both faces, no seals or shields.
The set is mounted in the marked orientation with the face marks aligned so the ground offsets stack correctly, clamped against square ground abutment faces, and handled as a unit.
Same-spec equivalents to this set: FAG B7008-E-T-P4S-TUL, SKF 7008 CD/P4ATBTA, NSK 7008A5TRSUV3TL, RHP 7008ETTULP4. A 2MM9108WI set has a 15° contact angle and a TUM or TUH set has medium or heavy preload; both share the envelope and are related sizes.
$132.57
11 in stock
$132.57
11 in stock
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