SKF1210EKTN9Self-Aligning Ball Bearing – 50 mm ID, 90 mm OD, 20 mm Width, 1:12 Tapered Bore, Polyamide Cage

Product Description

What this part is

SKF 1210 EKTN9 double-row self-aligning ball bearing with a tapered bore. Bore Diameter: 50 mm. Outside Diameter: 90 mm. Overall Width: 20 mm. Bore Type: Tapered 1:12. Rolling Elements: Ball. Number Of Rows: 2. Closure Type: Open. Dynamic Load Rating: 26,500 N. Static Load Rating: 9,150 N. Limiting Speed: 10,000 rpm. Reference Speed: 16,000 rpm. Cage Material: Polyamide. Cage Type: Window cage. Internal Clearance: CN. Precision Class: ABEC 1 / P0. Bearing Material: Bearing steel. Series: 1200. Base Number: 1210. GTIN: 7316576625060. Unit Quantity: 1 Pc.

Decoding the designation

12 — double-row self-aligning ball bearing, ISO dimension series 02. Two rows of balls run in two uninterrupted grooves on the inner ring and on one common sphered raceway in the outer ring.

10 — bore code. Bore Diameter: 50 mm.

E — reinforced internal design with a larger ball complement.

K — 1:12 tapered bore.

TN9 — glass-fibre reinforced polyamide window cage.

Searchable forms of the designation: 1210-EKTN9, 1210 EKTN9, 1210EKTN9, 1210E K TN9, 1210-EK-TN9, 1210K.

What these specs mean in practice

Permissible angular misalignment: 2.5°. The sphered outer raceway lets the inner ring, ball set and cage swivel bodily inside the outer ring, so shaft deflection and housing-bore misalignment do not edge-load the balls. That is why a self-aligning ball bearing is used on long line shafts, agricultural drives and textile machinery.

Dynamic Load Rating: 26,500 N. Static Load Rating: 9,150 N. Fatigue load limit: 475 N. Calculation factors: kr 0.04, e 0.21, Y0 3.2, Y1 3, Y2 4.6.

Limiting Speed: 10,000 rpm. Reference Speed: 16,000 rpm. A self-aligning ball bearing runs at very low friction, which is what puts these figures well above a roller bearing of the same size.

Bore Type: Tapered 1:12. Driving the inner ring up the taper expands it and sets the radial internal clearance to a measured figure, so the fit is made at assembly rather than by shaft tolerance.

A self-aligning bearing has no contact angle.

Mounting data

Bore Diameter: 50 mm, tapered 1:12. The tapered bore seats on an adapter sleeve, which converts a plain parallel shaft into a tapered seat. The tapered outside diameter of the sleeve equals the 50 mm bearing bore, which makes the matching sleeve an H210 on a 45 mm shaft, secured with a KM10 locknut and an MB10 lockwasher.

Outside Diameter: 90 mm to the housing bore. Overall Width: 20 mm. Inner ring shoulder diameter d1 approximately 61.7 mm. Outer ring shoulder diameter D1 approximately 78.1 mm. Chamfer dimension r1,2 min 1.1 mm. Housing abutment diameter Da max 83 mm. Fillet radius ra max 1.1 mm. Bore and outside-diameter tolerances Normal, JS7.

Quantity and configuration

Unit Quantity: 1 Pc. One complete double-row bearing, open on both faces.

Interchange guidance

Cross-Reference 1: SKF 1210 EKTN9. Cross-Reference 2: FAG 1210-K-TVH-C3. Cross-Reference 3: NSK 1210K. Cross-Reference 4: NTN 1210K. Cross-Reference 5: Koyo 1210K. Cross-Reference 6: Nachi 1210K. Cross-Reference 7: RHP 1210K. Cross-Reference 8: SNR 1210K. Cross-Reference 9: Timken 1210KTN.

All nine share the 50 x 90 x 20 mm envelope, the 1:12 tapered bore and the double-row self-aligning ball design, and all mount on an H210 adapter sleeve.