NSK 691 XZZ deep groove ball bearing
- Brand
- NSK
- Category
- Bearings
- Subcategory
- Deep groove ball bearings
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Decoding NSK 691 XZZ
- 69Series
- Deep groove ball bearings, 69 series. Series differ in outside diameter and width even when the bore is the same.
- 1Bore
- Bore: 1 mm.
- XZZSuffix
- NSK suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
691 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NSK 691 XZZ belongs to deep groove ball bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for 691 XZZ and any equivalents.
NSK XZZ series deep groove ball bearings are single-row components designed to handle radial and axial loads in both directions. Their steel cage and ball arrangement suit moderate to high speeds. Common applications include electric motors, pumps, fans, and transmissions. MR Industrial Accessories supplies these bearings and helps you identify the correct part number for your equipment.
The XZZ series includes part numbers such as 601 XZZ, 602 XZZ, 681 XZZ, 682 XZZ, 691 XZZ, and 692 XZZ. In each code, the digits define the size and series type, while the ZZ suffix indicates two metal shields, one on each side. These shields keep dust out and hold lubricant in place. If the code ends in 2RS, the bearing uses rubber seals; without a suffix, it is open. Knowing the complete code is essential to identify the exact variant.
These bearings appear in low and medium power electric motors, centrifugal pumps, fans, compressors, machine tools, and transmission equipment. They also serve the food, textile, and automotive industries, as well as maintenance workshops. Because they accommodate combined loads and require minimal maintenance, they are a practical choice for service and replacement work.
When selecting a bearing, consider the radial and axial load, rotation speed, and environmental conditions. ZZ sealing works well in dusty environments and is lubricated for life. For moisture or liquid exposure, 2RS sealing is the better option. Mount the bearing with suitable tools and avoid striking the raceway directly. Verify shaft and housing alignment, and lubricate according to the specification. Proper mounting helps extend service life.
NSK deep groove ball bearings can be interchanged with other brands that follow the same international designation. For example, a 6205 2RS is equivalent across SKF, FAG, NTN, and NSK. Always check tolerances and internal clearance, as these can differ by manufacturer. If you are unsure, send us the original code and we will identify a compatible alternative.
To request a quote for NSK XZZ series bearings, contact us via WhatsApp or email with the full code and the quantity you need. Our team replies promptly and can also advise on specific sealing or clearance variants.
Dimensions
- Bore
- 1.5 mm
Frequently asked questions
- What does the ZZ suffix mean on an NSK bearing?
- The ZZ suffix means the bearing has two metal shield covers, one on each side. These covers block dust and particles and retain lubricant, making them suitable for applications without direct liquid contact.
- How do I choose between an open, ZZ, or 2RS bearing?
- An open bearing allows lubrication and inspection but needs maintenance. ZZ is for dusty environments and permanent lubrication. 2RS has rubber seals for better protection against moisture and liquids. The choice depends on your working conditions.
- Are NSK XZZ series bearings interchangeable with other brands?
- Yes, deep groove ball bearings with an international designation are interchangeable among brands. For instance, a 6205 2RS from NSK is equivalent to one from SKF, FAG, or NTN. Always verify tolerances and internal clearance, which can vary.