NTN7208BAngular Contact Ball Bearing – 40 mm Bore x 80 mm OD x 18 mm Wide, 40° Contact Angle, Open, Pressed Steel Cage

Product Description

What this part is: NTN 7208B single-row angular contact ball bearing, ISO 7208 size. Bore: 40 mm. Outside Diameter: 80 mm. Width: 18 mm. Bearing Type: Single-row angular contact ball bearing. Number of Rows: 1. Rolling Elements: Ball. Contact Angle: 40°. Closure Type: Open. Cage Material: Pressed steel. Precision Class: ISO Class 0 (Normal). Internal Clearance: CN. Dynamic Load Rating: 32 kN (7,194 lbf). Static Load Rating: 23 kN (5,171 lbf). Limiting Speed: 8,300 rpm on grease, 11,000 rpm on oil. Item Weight: 0.380 kg (0.831 lb). Decoding the designation: 7208 — the ISO 7208 size, 40 x 80 x 18 mm, in the 72 medium dimension series. B — 40° contact angle. L1 — NTN’s pressed steel cage code, carried on the 7208BL1G carton marking. What these specs mean in practice: Contact Angle: 40°. The steepest angle NTN builds in this range. It puts most of the ball load line into the axial direction, so thrust capacity and axial stiffness are the highest of the angular contact family — and the speed rating is correspondingly lower than the 15° and 30° versions of the same size. Thrust is carried in one direction from a single row, so the shaft is normally located by a second bearing or a shoulder facing the other way. Dynamic Load Rating: 32 kN. Static Load Rating: 23 kN. NTN publishes these in three units: 32,000 N and 7,194 lbf dynamic, 23,000 N and 5,171 lbf static. Internal Clearance: CN. Normal radial internal clearance. Limiting Speed: 8,300 rpm on grease and 11,000 rpm on an oil bath. Cage Material: Pressed steel. Low mass and low windage, which is what keeps a 40° bearing running at 8,300 rpm on grease. Mounting data: Effective Load Centre (a): 34 mm from the bearing face. Bearing Chamfer (r min): 1.1 mm. Inner Chamfer (r1 min): 0.6 mm. Maximum Abutment Fillet Radius (ras max): 1 mm. Maximum Inner Abutment Fillet Radius (r1as max): 0.6 mm. Quantity and configuration: Unit Quantity: 1 Pc. One open bearing, supplied as an individual bearing. Cross-reference guidance: The 40 x 80 x 18 mm envelope is ISO standard and 7208 bearings from every maker share it. The contact angle is what decides substitution: a 7208B is 40°, a 7208AC is 25°, a 7208C is 15°, and a 7208A is 30° in the NSK scheme — all fit the same seats and all change the thrust-to-speed balance, which makes them related sizes only. SKF’s 7208 BE and 7208 BEGAP are the same 40° angle on the same envelope. Searchable variants of the part number: 7208B, 7208 B, 7208BL1G, 7208-B-L1-G, 7208-B-MP, 7208BMP.