Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
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3 in stock
Angular contact ball bearing matched pair, 55 x 100 x 21 mm, 15° contact angle, back-to-back mount, normal preload, ABEC 7. Open, 42 mm pair width.
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| MFR / Brand | NTN |
|---|---|
| Model | 7211 C DB GN P4 |
| Bearing Type | Angular Contact Ball Bearing, Matched Pair (Duplex Back-to-Back), Open, both faces |
| ID | 55 mm |
| OD | 100 mm |
| Width | 21 mm |
| Material | High Carbon Chrome Steel |
|---|---|
| Condition | New |
| Series | 7200 (72 Series, ISO 72xx) |
| Preload | GN – Normal preload (NTN ladder GL light / GN normal / GM medium / GH heavy) |
| Base Number | 7211C |
| Industry Terms | Super precision angular contact bearing, spindle bearing, duplex pair, DB set, machine tool bearing, precision ball bearing |
| Common Misspellings | 7211CDBGNP-4, 7211 CDGNP4, 7211CDBGN P4, NTN 7211 CDB GNP4, angular contant angle bearing |
| Application Types | Machine tool spindles, grinding spindles, high-speed gearboxes, precision rotary tables, pump and compressor shafts |
| Total Width | 42 mm (1.6535 in) across the matched pair |
| Bore Shaft Size | 55 mm (2.1654 in) |
| Mpn Variants | 7211CDBGNP4, 7211C/DBGNP4, 7211 C DB GN P4, 7211-C-DB-GN-P4, 7211CDB/GNP4, 7211CDBGNP4 NTN |
| Arrangement Configuration | Factory matched pair, 2 bearings, back-to-back (DB) |
| Precision Class | P4 / ABEC 7 |
| Additional Attributes | Load centre a 20.9 mm; fillet radii r 1.5 mm, r1 1.0 mm; shaft shoulder da min 63.5 mm, db min 60.5 mm; housing shoulder Da max 91.5 mm, Db max 94.5 mm; d1 69.0 mm; D2 92.3 mm; triple-row width 63 mm, quadruple-row width 84 mm; operating temperature −40 to 120 °C |
| Cage Type | Machined |
| Dynamic Load Rating | 86 kN matched pair (53.0 kN per bearing) |
| Static Load Rating | 80 kN matched pair (40.0 kN per bearing) |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Steel balls |
| Item Weight | 0.590 kg (1.301 lb) per bearing; 1.180 kg (2.602 lb) per pair |
| Cage Material | Phenolic |
| Limiting Speed | 11400 rpm grease / 14700 rpm oil |
| Number Of Rows | 1 row per bearing |
| Bore Type | Straight (round) |
| Internal Clearance | N/A – preloaded matched set |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 15° (degrees of arc) |
| Mounting Arrangement | DB – Back-to-back duplex |
| Design Units | Metric |
| Bearing Material | High carbon chrome steel |
| Part Number | 7211CDBGNP4 |
| Running Accuracy Radial And Axial Runout | Per ISO 492 / ABMA class ABEC 7 (P4) |
| Cross Reference 1 | SKF 7211 CD/P4ADGA (15° universally matchable pair) |
|---|---|
| Cross Reference 2 | NSK 7211CTRDBLP4 (15° back-to-back pair) |
| Cross Reference 3 | FAG B7211-C-T-P4S-UL (15° universally matchable) |
| Cross Reference 4 | 7211C single bearing (related size, one bearing, not a matched pair) |
| Cross Reference 6 | 6211 (related size, deep groove, same 55 x 100 envelope, 21 mm) |
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