NSK 7221 A angular contact ball bearing
- Brand
- NSK
- Category
- Bearings
- Subcategory
- Angular contact ball bearings
We respond promptly.
Since 1945 · Martínez, Buenos Aires, Argentina
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How to read NSK 7221 A
- 72Series
- Angular contact ball bearings, 72 series. For the same bore, each series has a different outside diameter and width.
- 21Bore
- 105 mm bore: 21 × 5.
- ASuffix
- NSK suffix: it defines the variant (sealing, cage, internal clearance or other features).
7221 is the standard (ISO) basic designation: it defines the type, the series and the bore.
Description
The NSK 7221 A bearing has a 105 mm bore, a 190 mm outside diameter and a 36 mm width (105 x 190 x 36 mm).
NSK 7221 A is a reference of angular contact ball bearing, within Bearings. Request a quote for 7221 A via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.
The NSK A series angular contact ball bearing is a bearing designed to support radial and axial loads in one direction. Its design with offset raceways allows angular contact between balls and raceways, which gives it a higher axial load capacity than a deep groove ball bearing. It is used in applications where precision and rigidity must be combined, such as machine tool spindles, pumps and gearboxes. At MR Accesorios Industriales we quote it on WhatsApp.
The A series designation is read with the bore number and the suffix that indicates the contact angle. For example, 7003 A, 7004 A and 7005 A correspond to single row bearings with a 30° contact angle. The final number is related to the bore diameter: the higher the number, the larger the diameter. The letter A indicates the standard contact angle of the series. Other suffixes may indicate a polyamide cage, internal clearance or precision, but it is always advisable to confirm the full part number when requesting a quote.
These bearings are used in industries such as metalworking, food, chemical and petrochemical. In Argentina they are commonly found in lathe and milling machine spindles, centrifugal pumps, screw compressors and speed reducers. They are also used in power transmission equipment where high rigidity and rotational precision are required, such as machine tools and measuring equipment. Their ability to support combined loads makes them suitable for tandem or paired arrangements.
To select the correct bearing, the axial and radial load, the rotational speed and the environmental conditions must be taken into account. Sealing is a key factor: if there is dust or moisture, variants with seals or shields should be chosen. Lubrication must be suitable for the temperature and speed; in high-precision applications low-friction grease is usually used. Mounting requires careful alignment and, in many cases, a preload adjustment to eliminate axial clearance. It is important to follow the manufacturer's recommendations for tightening torque and internal clearance.
Regarding equivalences, angular contact bearings from other brands with similar designations may be interchangeable, but the dimensions and contact angle must be verified. For example, an SKF 7005 ACD/P4A bearing may replace an NSK 7005 A if the tolerances and clearance match. However, not all suffixes are equivalent: the final letters may indicate differences in cage, angle or precision. It is always advisable to request a quote with the full part number and, if it cannot be identified, send a photo or the main dimensions.
If you need NSK A series angular contact bearings, at MR Accesorios Industriales we quote them for you. Send us the part number or the dimensions on WhatsApp and we will reply shortly. We can also advise you on the most suitable variant for your application.
Dimensions
Boundary dimensions of the basic designation 7221 per ISO 15: 105 x 190 x 36 mm (d x D x B).
- Bore
- 105 mm
- Outside diameter (D)
- 190mm
- Width (B)
- 36mm
Same size in SKF and other brands
Pages from other brands with the basic designation 7221: 105 x 190 x 36 mm (d x D x B) per ISO 15.
- Looking for the SKF 7221? We also quote:7221 BEP7221 BECBM7221 BECBP
- FAG7221-B-XL-MP
- NTN72217221B7221CT1B
- RKB7221
- TIMKEN7221 B
They share the boundary dimensions set by ISO 15, not the technical data: seals or shields, internal clearance, cage and load rating can differ by brand and suffix. We quote each one by its full part number.
Frequently Asked Questions
- What are the dimensions of the NSK 7221 A bearing?
- The NSK 7221 A bearing has a 105 mm bore, a 190 mm outside diameter and a 36 mm width (105 x 190 x 36 mm). These are the standardised boundary dimensions (ISO 15) of the basic designation 7221.
- What does the A suffix mean in NSK bearings?
- The A suffix indicates a 30° contact angle, which is the standard for this series. This defines the axial load capacity and the rigidity of the bearing. Other suffixes may indicate additional characteristics such as cage, clearance or precision.
- How do I choose between an angular contact bearing and a deep groove ball bearing?
- If the application has a significant axial load in one direction, the angular contact bearing is more suitable because it handles that force better. If the load is mainly radial and there is little space, a deep groove ball bearing may be sufficient. The choice depends on the load ratio and the required precision.
- Are NSK A series bearings interchangeable with other brands?
- They may be interchangeable if dimensions, contact angle and tolerances match. Not all suffixes are equivalent between brands. To be sure, send us the part number of the original part or the dimensions and we will indicate the compatible option.