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2 in stock
Matched back-to-back duplex pair of angular contact ball bearings, 45 mm bore, 85 mm OD, 19 mm width each, 38 mm total mounted width. 29 degree contact angle, open, straight bore. 1 Set, 2 Pcs.
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| MFR / Brand | MRC |
|---|---|
| MPN | 7209DB |
| Model | 7209-DB-100 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 85 mm |
| Width | 38 mm |
| Material | Chrome Steel |
|---|---|
| Series | 7200 |
| Condition | New – Open box |
| Lubricant | Oil |
| Base Number | 7209 |
| Industry Terms | angular contact ball bearing; duplex pair; back-to-back matched set; DB bearing pair; 29 degree angular contact; MRC 7209 |
| Common Misspellings | 7209 D B; 7209BD; 7209-DB100; MRC 7209 angular contack; 7209DB bering set |
| Application Types | Machine tool spindles, pump and gearbox shafts requiring bidirectional thrust, vertical shafts, moment-loaded mountings |
| Total Width | 38 mm (1.4961 in) mounted pair |
| Condition Note | Made In USA, New Old Stock, Rusty (See Pictures) |
| Bore Shaft Size | 45 mm (1.7717 in), straight bore |
| Mpn Variants | 7209DB; 7209-DB; 7209 DB; 7209-DB-100; 7209 DB 100; 7209DB100 |
| Arrangement Configuration | Matched duplex pair, back-to-back (DB) |
| Additional Attributes | 29 degree MRC contact angle carries more thrust than a 25 degree and more speed than a 40 degree of the same envelope; back-to-back pair resists overturning moment and locates axially in both directions; rings ground for preload without shims |
| Min Temp | -30°C |
| Cage Type | Pressed |
| Dynamic Load Rating | 67 kN |
| Static Load Rating | 45 kN |
| Precision Rating | ABEC 1 / P0 |
| Rolling Elements | Ball |
| Max Temp | 120°C |
| Item Weight | 1.80 lbs |
| Cage Material | Steel |
| Number Of Rows | 1 per bearing, 2 rows as a mounted pair |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 29° (MRC 7000-series scheme) |
| Mounting Arrangement | Back-to-Back |
| Design Units | Metric |
| Bearing Material | Chrome bearing steel |
| Part Number | 7209DB |
| Cross Reference 1 | SKF 7209 BEP (related size, 40 degree contact angle) |
|---|---|
| Cross Reference 2 | FAG 7209-B-TVP (related size, 40 degree contact angle) |
| Cross Reference 3 | MRC 7209 DB (same set, spaced form) |
| Cross Reference 4 | 7209-DB-100 order code |
A matched pair of single-row angular contact ball bearings, supplied as a back-to-back duplex set. Each bearing is 45 mm bore, 85 mm outside diameter, 19 mm width; mounted as a pair the assembly measures 38 mm across the two inner ring faces. The ISO envelope corresponds to the 7209 size.
7209 is the size identity: 72 dimension series, bore code 09 for 45 mm. In the MRC scheme the 7000-series angular contact bearings are built to a 29° contact angle, which is MRC’s own standard and differs from the ISO 40° B-series and from the 15° and 25° super-precision angles. DB is the back-to-back duplex arrangement. The trailing 100 is an MRC order-code block covering the matching deviation and is not published as a spec.
A 29° contact angle sits between the 25° and 40° standards: more thrust capacity than a 25° bearing, more speed capability than a 40°. Because the angle differs from the ISO norms, thrust capacity, mounted preload and axial stiffness all differ from a nominally same-size 7209 B or 7209 AC. A back-to-back pair sets the contact lines diverging outward, giving a wide effective load span and high resistance to overturning moment, and it takes thrust in both axial directions. The rings are ground so that clamping the two inner rings together establishes a defined preload without shims.
1 Set, 2 Pcs. Matched back-to-back duplex pair, open, no seals and no shields. Straight bore. Bearings only, no spacer ring, no locknut, no snap ring.
The two bearings of a matched pair are ground as a unit and are installed together in the ground orientation, with the back faces together. Mounting force is applied to the inner rings. Operating range is −30 °C to 120 °C.
Interchange for a 29° MRC duplex pair is with another MRC 7209 DB set. SKF 7209 BEP and FAG 7209-B-TVP are related sizes rather than substitutes: they share the 45 x 85 x 19 mm envelope but run a 40° contact angle, so thrust capacity, axial stiffness and mounted preload differ. A 7209 C or 7209 AC pair is likewise a related size at 15° and 25°.
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