NSK7208ATP4Angular Contact Ball Bearing – 40 mm ID, 80 mm OD, 18 mm Width, Open, 30° Contact Angle, ABEC 7, Machined Phenolic Cage

Product Description

What this part is: NSK 7208ATP4 single-row angular contact ball bearing. Bore: 40 mm. Outside Diameter: 80 mm. Overall Width: 18 mm. Number Of Rows: 1. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: carbon chrome bearing steel. Series: 7200, ISO dimension series 02. Item Weight: 0.375 kg (0.83 lb). Decoding the designation: Contact Angle: 30°, given by the A. In NSK’s scheme A is 30°, A5 is 25° and C is 15°. Cage Material: laminated phenolic, given by the T. Cage Type: machined. Precision Class: P4, equivalent to ABEC 7 and ISO Class 4. Searchable forms of the number: 7208ATP4, 7208-A-T-P4, 7208 A T P4, 7208A. Load ratings and speed: Dynamic Load Rating: 35.5 kN (7,981 lbf). Static Load Rating: 25.1 kN (5,642 lbf). Limiting Speed: 13,000 rev/min on oil lubrication and 9,500 rev/min on grease. Maximum Operating Temperature: 120 °C. Lubricant: grease or oil. What these specs mean in practice: A 30° contact angle is the high-thrust end of the standard angular contact range: it carries substantially more axial load and gives more axial stiffness than a 15° or 25° execution in the same 40 x 80 x 18 mm envelope, and it gives up speed for it. That makes it the choice for a position where thrust, not rotational speed, sets the duty. P4 tolerances hold bore, outside diameter, radial runout and face runout far tighter than a standard-class bearing, so the shaft is located precisely and runs quieter. The laminated phenolic cage is machined, light and self-lubricating, which keeps cage friction and heat down and sets the 120 °C ceiling. Quantity and configuration: Unit Quantity: 1 Pc. Interchange guidance: The 40 x 80 x 18 mm envelope at 30° is shared with the Koyo 7208, the NTN 7208 and the Nachi 7208, all of which carry 30° where no angle letter is present in their own schemes. Carton tokens carried on this listing: 3MM208 WI CR and B7208E. Those are 25° designations in the Fafnir and RHP schemes, so a bearing built to either is a related size in this envelope rather than a substitution for a 30° part. A 7208C or 7208A5 is likewise a related size at 15° and 25°.