NSK 687 tapered roller bearing cone
- Brand
- NSK
- Category
- Bearings
- Subcategory
- Deep groove ball bearings
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Decoding NSK 687
- 68Series
- Deep groove ball bearings, 68 series. Series differ in outside diameter and width even when the bore is the same.
- 7Bore
- Bore: 7 mm.
687 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NSK 687 belongs to tapered roller bearing cone, 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 687 and any equivalents.
Deep groove ball bearings from NSK handle radial and axial loads in both directions. They are common in electric motors, pumps, fans and transmissions, among other industrial equipment. MR Industrial Accessories supplies this line and helps you identify the right code for your application.
The part number tells you most of what you need. In a code such as 687, the 68 indicates a thin-section series and the final 7 gives a 7 mm bore. Suffixes, when present, cover details like seals (2RS, ZZ), cage type (J, T) or internal clearance (C3, C4). Reading the nomenclature correctly, and checking it against drawings or data sheets, avoids ordering the wrong variant.
These bearings appear in electric motors, centrifugal pumps, compressors, fans, conveyor belts and machine tools, and are used in sectors that include agricultural machinery, transport equipment, food processing, chemical and petrochemical plants. Their design allows high-speed operation, which suits equipment where low maintenance and reliable running matter.
Selection comes down to a few points. Open bearings run faster with less friction; 2RS or ZZ versions keep contaminants out and lubricant in. Choose internal clearance for the working temperature and mounting fit, and decide between grease and oil lubrication. Keeping shaft and housing aligned prevents extra loads, and careful mounting extends service life.
Equivalents exist between brands: a bearing with the same designation and dimensions can replace another, provided tolerances and sealing type match. Not every code swaps directly, since cage, clearance or lubricant differences can change performance. When in doubt, have a specialist confirm compatibility.
To request a quote, send the complete code, such as 687, or the housing dimensions by WhatsApp or email. The team replies promptly and can suggest equivalents and help with mounting and lubrication questions.
Dimensions
- Bore
- 7mm
Frequently asked questions
- What does code 687 mean on an NSK bearing?
- It identifies a deep groove ball bearing of the 68 series, thin section. The last digit gives the bore: 7 mm. Any suffixes indicate sealing, cage or internal clearance.
- How do I check if an NSK bearing fits my equipment?
- Confirm bore, outer diameter and width, plus sealing type and clearance. With the original code we can quote the NSK equivalent; if unsure, send us the shaft and housing dimensions.
- What lubrication suits deep groove ball bearings?
- It depends on speed, temperature and environment. High speeds call for low-viscosity grease; humid or contaminated conditions call for greases with EP additives. Sealed bearings arrive factory-lubricated.