IBCSuper Precision Angular Contact Ball Bearing – 40 mm ID, 68 mm OD, 15 mm Width, Open, 25° Contact Angle, ABEC 7 / P4, Machined Phenolic Cage, Light Preload

Product Description

What this part is: IBC B7008-E-TPA-PA7-UL super-precision angular contact ball bearing. Bore 40 mm, outside diameter 68 mm, width 15 mm. Series: 70 (7008 envelope). Contact Angle: 25°. Precision Class: ABEC 7 / P4. Machined phenolic cage, outer-ring land-riding, open both faces. Preload: light. IBC is a German precision bearing maker at Solms. Country of origin: United Kingdom. Decoding the designation: 7008: angular contact ball bearing on a 40 mm bore, 70 dimension series. E: 25° contact angle. TPA: machined cage of fabric-base laminate phenolic. PA7 / P4: ABEC 7 accuracy. UL: light preload, universally ground faces. The carton also carries the Fafnir designation 3MM9108WI CR SUL for the same bearing, in which 3MM confirms the 25° angle, the 9108 confirms the ISO 7008 envelope, and CR confirms the outer-land-riding phenolic cage. Published ratings: Dynamic load rating: 20.8 kN. Static load rating: 15.6 kN. Limiting speed: 22,000 rpm. Operating range: −30 °C to 120 °C. Mass: 0.42 lb. Lubrication: oil. What these specs mean in practice: A 25° contact angle carries substantially more thrust than a 15° bearing of the same size and gives up some speed for it, which is why it is chosen for spindles that take heavy cutting thrust. The machined phenolic cage rides on the outer-ring land, runs light and quiet, and holds oil in its own structure, so it tolerates high speed and marginal lubrication. ABEC 7 accuracy holds runout tight enough to keep surface finish and tool life predictable. Light preload trades a little stiffness for lower heat generation. Quantity and configuration: One bearing, universally ground so it matches with any other bearing of the same designation. Unit quantity: 1 Pc. Fitting notes: Straight 40 mm bore. Universally ground faces set the preload from the ground faces when bearings are clamped together, with no shimming at assembly. As a preloaded bearing it runs with no set radial clearance, so the internal clearance field reads N/A. Interchange guidance: Same-specification designations: Fafnir / Timken 3MM9108WI CR SUL, SKF 7008 ACD/P4 and NSK 7008A5TYNSULP4, all 25° on the 40 x 68 x 15 mm envelope. Searchable forms of the number: 7008ETPAPA7UL, B7008-E-TPA-PA7-UL, 7008 E TPA PA7 P4 UL, 7008E, 3MM9108WI.