SKF 6306-ZNR/C3 deep groove ball bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Deep groove ball bearings
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Since 1945 · Martínez, Buenos Aires, Argentina
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Other brands in this category
Ask us about alternatives. Equivalence is verified for each reference and application.
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How to read SKF 6306-ZNR/C3
- 63Series
- Deep groove ball bearings, 63 series. For the same bore, each series has a different outside diameter and width.
- 06Bore
- 30 mm bore: 06 × 5.
- ZNR/C3Suffix
- SKF suffix: it defines the variant (sealing, cage, internal clearance or other features).
6306 is the standard (ISO) basic designation: it defines the type, the series and the bore.
Description
The SKF 6306-ZNR/C3 bearing has a 30 mm bore, a 72 mm outside diameter and a 19 mm width (30 x 72 x 19 mm).
SKF 6306-ZNR/C3 is a reference of deep groove ball bearing, within Bearings. Request a quote for 6306-ZNR/C3 via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.
The SKF deep groove ball bearings of the -ZNR/C series are components designed to support radial and axial loads in both directions. They incorporate a retaining ring and a shield that simplify assembly and protect against contaminants. They are used in a wide variety of industrial applications where reliability and low maintenance are required.
The designation of these bearings is interpreted as follows: the numeric prefix indicates the size and series (for example, 6211 or 6306). The -Z suffix indicates that the bearing has a shield on one side, offering protection against dust and dirt. The N indicates that it incorporates a groove in the outer ring for the retaining ring, and the R that it is supplied with said snap ring. The /C3 suffix specifies a greater internal radial clearance than standard, suitable for applications with elevated temperatures or interference fits.
These bearings are used in industries such as food, chemical, mining and manufacturing in general. They are common in electric motors, pumps, fans, conveyors and transmission machinery. Thanks to their design with retaining ring, they facilitate axial mounting in housings without the need for additional covers, which reduces costs and assembly times. Their shield makes them suitable for environments with moderate presence of particles.
To correctly select a bearing with -ZNR/C3 suffixes, take into account the radial and axial load it must support, the rotation speed and the environmental conditions. The C3 clearance is recommended when thermal expansions are expected or when the fit on the shaft and housing generates a reduction in internal clearance. During assembly, ensure proper alignment between shaft and housing, and avoid striking the retaining ring. Lubrication must be adequate for the operating temperature and speed; in many cases, these bearings come pre-lubricated from the factory.
Regarding equivalences and interchangeability, deep groove ball bearings with similar suffixes from other manufacturers may be compatible, but it is essential to verify critical dimensions and internal clearance. Not all suffixes match between brands, so it is always advisable to compare technical specifications. At MR Accesorios Industriales we sell SKF and can advise you to find the appropriate replacement.
If you need a quote for an SKF bearing with -ZNR/C3 suffixes, send us the complete code via WhatsApp. At MR Accesorios Industriales we help you identify the correct option for your application and provide the technical support you need.
Other SKF versions of the 6306 series
These versions of the 6306 series appear in SKF catalogues and do not have their own page on this site. Ask us about any of them with the part number: we will source it and send you a quote.
- SKF 6306 ETN9
- SKF 6306 N
Dimensions
Boundary dimensions of the basic designation 6306 per ISO 15: 30 x 72 x 19 mm (d x D x B).
- Bore
- 30mm
- Outside diameter (D)
- 72mm
- Width (B)
- 19mm
The same size in other brands
Pages from other brands with the basic designation 6306: 30 x 72 x 19 mm (d x D x B) per ISO 15.
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 SKF 6306-ZNR/C3 bearing?
- The SKF 6306-ZNR/C3 bearing has a 30 mm bore, a 72 mm outside diameter and a 19 mm width (30 x 72 x 19 mm). These are the standardised boundary dimensions (ISO 15) of the basic designation 6306.
- What does the -ZNR suffix mean in an SKF bearing?
- The -ZNR suffix indicates that the bearing has a shield (Z), a groove for a retaining ring in the outer ring (N) and is supplied with the retaining ring (R). This facilitates axial mounting and protects against contaminants.
- When is it advisable to use a bearing with C3 clearance?
- C3 clearance is recommended when the bearing will operate at elevated temperatures, with interference fits that reduce internal clearance, or in applications where greater tolerance to thermal expansion is required. It helps prevent overloads and premature failures.
- Are SKF bearings with -ZNR/C3 suffixes interchangeable with other brands?
- They may be interchangeable with bearings from other brands that have equivalent specifications, but it is essential to verify dimensions, internal clearance and seal type. Not all suffixes match between manufacturers, so it is recommended to consult a specialist.