Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
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Availability:
4 in stock
Super-precision angular contact ball bearing set, 60 x 85 x 13 mm, 15 degree contact angle, light preload, open, machined phenolic cage, ABEC 7. Three pieces.
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$520.18
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| MFR / Brand | SKF |
|---|---|
| MPN | 71912CDP4ATGA |
| Model | 71912CD/P4A-TGA |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 60 mm |
| OD | 85 mm |
| Width | 13 mm |
| Material | Bearing Steel |
|---|---|
| Series | 71900 |
| Condition | New |
| Lubricant | Grease |
| Preload | Light Preload |
| Base Number | 71912 |
| Industry Terms | spindle bearing, super precision bearing, machine tool bearing, matched triplex set, universally matchable, ABEC 7, 719 series |
| Total Width | 39 mm for the triplex set |
| Bore Shaft Size | 60 mm |
| Mpn Variants | 71912 CD/P4ATGA, 71912CDP4ATGA, 71912-CD-P4A-TGA, 71912CD/P4A-TGA, 7912, 71912CDTGA |
| Arrangement Configuration | Matched set of 3, universally matchable |
| Precision Class | P4A |
| Cage Type | Machined |
| Dynamic Load Rating | 19.9 kN / 4474 lbf per bearing |
| Static Load Rating | 15.3 kN / 3440 lbf per bearing |
| Precision Rating | ABEC 7 / P4A, running accuracy to ABEC 9 / P2 |
| Rolling Elements | Steel balls |
| Max Temp | 120°C |
| Item Weight | 0.43 lbs per bearing |
| Cage Material | Fabric-reinforced phenolic resin |
| Limiting Speed | 15000 rpm |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Internal Clearance | N/A - preloaded |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 15° (degrees of arc) |
| Mounting Arrangement | Not specified |
| Design Units | Metric |
| Bearing Material | Bearing steel |
| Part Number | 71912 CD/P4ATGA |
| Cross Reference 1 | Fafnir 3MM9312WI-TUL (related size, 25° contact angle) |
|---|---|
| Cross Reference 2 | Fafnir 2MM9312WI-TUL (15° contact angle equivalent) |
| Cross Reference 3 | SKF 71912 ACD/P4ATGA (related size, 25° contact angle) |
| Cross Reference 4 | SKF 71912 CD/P4ATGB (related size, medium preload) |
SKF 71912-CD/P4ATGA super-precision angular contact ball bearings, supplied as a matched set of three. Series: 719, extra light section. Bore: 60 mm. Outside Diameter: 85 mm. Width: 13 mm per bearing. Open on both faces, machined fabric-reinforced phenolic resin cage, steel balls on steel raceways. Searchable forms: 71912 CD/P4ATGA, 71912CDP4ATGA, 71912-CD-P4A-TGA, 71912CD/P4A-TGA, 7912.
Contact Angle: 15°. Precision Class: P4A — ABEC 7 dimensional tolerance with running accuracy held to ABEC 9. Set size: three bearings. Preload: light. Universally matchable grinding. Cage: machined phenolic resin, rated for continuous service to 120°C.
A 15° contact angle favours speed and radial stiffness over thrust capacity, which is why this design dominates high-speed grinding and milling spindles. The 719 section is the thinnest of the super-precision envelopes, giving a large bore in a small outside diameter. Per bearing: Dynamic Load Rating 19.9 kN (4 474 lbf), Static Load Rating 15.3 kN (3 440 lbf). Limiting speed: 15 000 r/min. Light preload keeps heat generation and friction low while still removing internal clearance.
Three bearings. Unit Quantity: 3 Pcs. Universally matchable: the rings are ground so the bearings reach the specified light preload when clamped together, which allows the three to be built as back-to-back, face-to-face or tandem combinations. Open bearings, lubricated on installation with grease or oil.
All three bearings are clamped against a common shoulder and locknut for the ground preload to take effect. The phenolic cage sets the temperature ceiling at 120°C. Preloaded bearings run without internal clearance, so shaft and housing seats are held to super-precision tolerances.
The 15° Fafnir equivalent on this envelope is the 2MM9312WI series. Fafnir 3MM9312WI-TUL is a related size on the same 719 envelope with a 25° contact angle. SKF 71912 ACD/P4ATGA is a related size at 25°. SKF 71912 CD/P4ATGB is a related size at medium preload.
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