Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
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Angular contact ball bearing, 45 x 85 x 19 mm, 25° contact angle, universally ground single, light preload class, PA1 accuracy.
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| MFR / Brand | NSK |
|---|---|
| MPN | 7209A5TYDULPA1 |
| Model | 7209 A5 TY DUL PA1 / 3MM209 WI CR DUL / B7209E |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 85 mm |
| Width | 19 mm |
| Condition | New |
|---|---|
| Preload | Light |
| Material | Bearing Steel |
| Base Number | 7209 |
| Industry Terms | Angular contact ball bearing, super precision spindle bearing, universally ground single, light preload, 25 degree angular contact |
| Bore Shaft Size | 45 mm |
| Mpn Variants | 7209A5TYSULPA1, 7209-A5-TY-SUL-PA1, 7209A5TYSUL, 7209A5TYDULPA1, 7209A5, 7209E, B7209E, 3MM209WI CR DUL |
| Arrangement Configuration | Universally ground single (SU) |
| Precision Class | PA1 (NSK special accuracy class) |
| Additional Attributes | Axial rigidity 147 N/micrometre at light preload; permissible axial load Pa 23.3 kN; effective load centre a 24.7 mm; shaft abutment da min 52 mm; housing abutment Da max 78 mm, Db max 80 mm; fillet radii ra 1 mm, rb 0.6 mm; grease charge 2.5 g |
| Min Temp | -30°C |
| Cage Type | Ball-guided |
| Dynamic Load Rating | 49.0 kN |
| Static Load Rating | 27.6 kN |
| Precision Rating | PA1 (NSK special accuracy class) |
| Rolling Elements | Balls |
| Max Temp | 120°C |
| Item Weight | 0.90 lb (0.402 kg) |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Not specified |
| Internal Clearance | N/A |
| Contact Angle | 25° |
| Mounting Arrangement | Universally ground single (SU) |
| Design Units | Metric |
| Bearing Material | High carbon chrome bearing steel |
| Running Accuracy | PA1 special class |
| Part Number | 7209A5TYSULPA1 |
| Running Accuracy Radial And Axial Runout | PA1 special class |
| Cross Reference 1 | SKF 7209 ACD |
|---|---|
| Cross Reference 2 | Fafnir 3MM209WI CR |
| Cross Reference 3 | 7209CTYP5 (related size, 15° contact angle) |
| Cross Reference 4 | 7209ATYP5 (related size, 30° contact angle) |
NSK 7209A5TYSULPA1 super-precision angular contact ball bearing. Bore: 45 mm. Outside diameter: 85 mm. Width: 19 mm. Series: 7200, ISO 72 dimension series. Bore form: straight. Closure: open.
A5: 25° contact angle. TY: ball-guided cage. SU: universally ground single bearing, so any two pieces stack back-to-back, face-to-face or in tandem. L: light preload class. PA1: NSK special accuracy class. Searchable forms include 7209A5TYSULPA1, 7209-A5-TY-SUL-PA1, 7209A5TYSUL, 7209A5 and 7209E. The carton also carries the Fafnir cross-reference 3MM209WI CR.
Basic dynamic load rating: 49.0 kN. Basic static load rating: 27.6 kN. Limiting speed: 15,400 rpm on grease, 23,100 rpm on oil-air. Permissible axial load: 23.3 kN. Effective load centre: 24.7 mm. Light preload across a matched pair of these bearings is 333 N, giving 147 N/µm of axial rigidity. A 25° contact angle sits between the 15° high-speed and 30° high-thrust executions: more thrust capacity and stiffness than a 15° bearing, higher speed capability than a 30°.
One bearing, universally ground. Universal grinding means the faces are finished so that pieces of the same designation reach the published preload on clamp-up in any arrangement, without a spacer.
Shaft abutment diameter: 52 mm minimum. Housing abutment diameter: 78 mm maximum, 80 mm on the outer shoulder. Shaft fillet radius: 1 mm maximum; housing fillet radius: 0.6 mm maximum. Recommended grease charge: 2.5 g.
SKF 7209 ACD and Fafnir 3MM209WI cover the same 45 x 85 x 19 mm envelope at 25°. 7209CTY at 15° and 7209ATY at 30° are related sizes rather than interchanges, because the contact angle changes thrust capacity and speed rating.
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