The &#;4T-&#; prefix designates a tapered roller bearing that is made of a special grade of case-hardened bearing steel and is interchangeable with other manufacturers taper with the same part number.
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The "LB" seal is a non-contact seal for reduced torque or higher speed requirements. The "LU" seal is contact seal for better grease contamination control, but the contact friction increases torque and lowers the limiting speed.
NTN follows the ISO precision tolerance classes of P0, P6, P5, P4 and P2, which are equivalent to ABMA classes ABEC 1, ABEC 3, ABEC 5, ABEC 7 and ABEC 9, respectively.
D1 always denotes a relube feature (any bearing). T is old nomenclature for inch dimensioned bearing units housings with a relube feature.
Usually a G1 suffix is used to indicate a bronze or brass cage in a cylindrical roller bearing. In rare applications an L1 type cage has been used as well.
A tapered bore on any NTN bearing (except tapered roller bearings) is a &#;K&#; (1 to 12 ratio) or &#;K30&#; (1 to 30 ratio) suffix.
NTN does not use "CE" or "C0". These are competitor terms for electric motor and normal internal clearances. Clearance does not indicate any type of fit.
For NTN "V1" stands for the first special variation on this basic part number. This suffix lettering does not indicate any specific features. A print will have to be reviewed to see the exact special features.
In a part number like ZZC3/2AU3A the "U3A" can be a packaging code or specific customer identification code. This does not affect the bearing features.
LD1NR is the current suffix used on cylindrical outer ring bearing unit inserts. The "L" indicates it meets the new Japanese Industrial Specifications. The "D1" indicates it has a relube feature. The "NR" means it has a snap ring groove and snap ring on the outer diameter. This new suffix (LD1NR) will replace the older suffix D1NR on all future stock orders on this type of bearing.
All of these part numbers are from the bearing component of an eccentric locking collar bearing. The locking collar for all three would have EL205-100 marked on the side. Generally speaking, NTN stocks the bearing & collar together. The part number to search for would be UEL205-100, AEL205-100 or JEL205-100. This would provide you with both the bearing & the eccentric locking collar.
The TMB material is a special material developed for ball bearings by NTN for high load & long life applications. Part numbers that use this material have the '6' replaced by 'TMB' (i.e. becomes TMB206). Many end users commonly misread this part number as TM which is a part number you will not find. When given a part number that starts with TM8... replace it with TMB... and continue your search.
Both of the callouts indicate that the housing comes with cast covers. C- is for an open cover. An open cover has a hole and seal to allow the shaft to continue past the bearing unit. CM- is a closed cover, which is a solid piece that closes off the bearing unit.
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Any part that has the FG1 suffix at the end will come with food-grade solid lube. This suffix is used on both Sentinel series & standard NTN products. NTN uses a food-grade solid lube that is NSF H1 certified for use in all food production areas. If my Sentinel part does not have FG1 at the end will it have a food grade grease? Yes, ALL Sentinel series parts come filled with a food-grade grease that is NSF H1 certified. The FG1 just designates that the bearing comes with a food-grade SOLID LUBE.
Instead of using the specified arrangement, you can look at using Universal Flush Ground. The Universal Flush Ground is where the bearing is made & to be assembled in any arrangement (DB, DF or DT) & perform with no issues. The part number would begin at CDB/GNP4 and end with CGD2/GNP4 (NTN) or CVDUJ74 (SNR).
How do I choose the right bearing?
One must, before selecting bearings, know or define the requirements profile of the application. Space, bearing arrangement, speed, loads, required stiffness, lubrication, etc. are parameters which must be considered. You can make your choices based on bearing data.
You can find more here or on page 57 et seq as well as 80and81 in our catalog in the download area.
You can also contact our technical applications consultants.
Where do I find technical data on GMN high-precision ball bearings?
The Ball Bearings chapter shows complete technical information under &#;Engineering&#; on the topics of construction, design, lubrication, tolerances, key bearing data and bearing calculations. Handling shows you everything you need to know about correct handling of bearings, installation preparation as well as the process of greasing the bearings.
You can find this information in our main catalog, &#;High Precision Ball Bearings,&#; which is available in the download area. You can also find further information as well as technical information sheets.
You can find technical information about a specific type of bearing in our data sheets in your product search.
What doe the suffixes and prefixes mean in a bearing name?
The meaning of suffixes and prefixes for a GMN ball bearing name are explained in the nomenclature scheme in our catalog (spindle bearings: Page 20, grooved bearings: Page 50). Information about decrypting other manufacturers&#; names can be found on page 44.
You can also contact our technical applications consultants for further information.
What RPM limits are in place for GMN ball bearings?
The RPM&#;s shown in the bearing tables are nominal limit values, which are related to individual bearings which are pre-stressed with springs or under average conditions. If operating conditions are different than those stated, one must take correction factors into account (the correction factors and RPM values are standard values).
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If you have questions about your specific application, you can also contact GMN.
What life expectancy do bearings have for my application?
The exact calculation of life expectancy of a ball bearingandbearing system take a lot of effort, and is influenced by a number of factors, including:
The probable life of a bearing can be determined using the material fatigue under defined operating conditions.
GMN&#;s Globus program offers technicians, designers and developers the opportunity to calculate ball bearings in a simple and easy manner. The catalog data and calculation results can be seen right away.
GMN uses modern calculation software to lay out individual bearings as well as complex bearing systems. Technical applications consultants would be happy to work with you in designing your application.
What is O, X or tandem arrangement?
Bearing pairs can be installed in an O, X or tandem arrangement. The pressure lines for force flows describe either an X or an O. In a parallel alignment, the bearings are mounted in tandem. With stiff bearing pre-tensioning, specified bearing pairs in O, X or tandem arrangements offer an effective, cost-effective and technical solution for many applications.
You can find further information here.
Where can I buyandorder GMN high-precision ball bearings?
GMN is represented country-wide by many distributor partners. They are available to you as contacts to answer your questions about our products in regards to delivery times, price, storage, technical information, etc. You can find a list of our distributors in Germany and an overview of representatives abroad here.
Who are my GMN contacts for commercial and technical information about GMN high-precision ball bearings?
You can find your contact for the ball bearings area by responsibility under &#;contact&#;. The GMN sales team would be happy to answer your questions by or .
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