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Cara Membaca Kode Bearing: Panduan 2026

Cara Membaca Kode Bearing: Panduan 2026

Standard bearing designation numbers are alphanumeric codes that identify a bearing's type, series, bore size, and specific features like seals or internal clearance[1][2]. For industrial buyers and maintenance technicians across Indonesia, accurately decoding these part numbers ensures you can confidently measure and order the correct HI-TEC or HI-TEC SILVER replacement bearing for your machinery.

A worn-out bearing installed with the wrong specifications leads to premature failure, costly machine downtime, and higher operational expenses. Understanding the basic designation and supplementary codes allows your procurement team to bypass the guesswork. This guide explains how to read standard bearing numbers, calculate the bore diameter in millimeters using the simple multiplier rule, and decipher common suffix codes so your facility always orders the exact replacement part required.

How do you read standard bearing designation numbers?

Standard bearing designation numbers are typically split into a basic designation and supplementary codes that identify the bearing type, ISO dimension series, and bore code[1][3]. For standard metric bearings with a bore code of 04 or higher, you multiply the last two digits by five to determine the bore diameter in millimeters[2][4].

The basic designation usually consists of three to five digits[5][6]. The first digit or letter identifies the bearing type, the next digits indicate the dimension series, and the final two numbers represent the bore code[5][2]. For example, in a 6205 bearing, the "05" is the bore code. Multiplying 05 by five gives a 25 mm bore diameter[2][7]. This rule applies to standard metric radial bearings covered by ISO 15 standards, spanning bore codes from 04 up to 96[1][8].

There are four standard exceptions to this multiplier rule for smaller bearings: - 00 equals a 10 mm bore[2][9]. - 01 equals a 12 mm bore[4][10]. - 02 equals a 15 mm bore[2][10]. - 03 equals a 17 mm bore[2][4].

Bearing Number Bore Code Exact Bore Diameter
6204 04 20 mm[11][2]
6205 05 25 mm[2][12]
6308 08 40 mm[11][2]
6409 09 45 mm[11][12]
6212 12 60 mm[2][13]

Understanding these codes helps you browse any standard bearing size chart accurately. By applying the multiplier rule to the last two digits, workshop mechanics in Jakarta or Surabaya can instantly verify the internal diameter of a required part without physically measuring an undamaged bearing.

What do the suffixes 2RS and ZZ mean on a bearing?

Suffix codes indicate specific bearing features, where 2RS denotes two rubber seals, ZZ indicates two metal shields, and C3 represents a larger internal radial clearance[14][15]. While the main designation dictates physical dimensions, the suffix dictates how the bearing handles contamination, friction, and thermal expansion[16][17].

A 2RS suffix means the bearing utilizes double rubber seals, providing robust protection against dust and moisture, though it generates slightly higher friction[14][15]. A ZZ (or 2Z) suffix indicates double metal shields, offering lower friction for high-speed rotational applications, but providing less sealing capability[14][18]. Finally, C3 indicates an internal radial clearance greater than normal, accommodating thermal expansion in high-temperature environments[14][19].

If your bearing is destroyed or the designation number is completely worn off, you must manually measure the part to order from our HI-TEC SILVER replacement bearings product category.

  1. Clean the bearing: Remove all grease and dirt so your digital caliper jaws seat flush against the metal[20][21].
  2. Measure the inner diameter (bore): Insert the inside-measurement anvils of the caliper into the bore, opening them until they lightly touch the inner ring walls[22][23].
  3. Measure the outer diameter (OD): Place the outside jaws around the bearing's exterior edge, closing them until they just contact the outer ring[24][25].
  4. Measure the width: Place the outside jaws across the two flat side faces of the bearing to capture the exact thickness[22][25].
  5. Match the dimensions: Take three readings for each dimension to account for wear, then compare your ID, OD, and width against a supplier catalog to identify the exact series code[20][26].

Frequently Asked Questions

How do you read standard bearing designation numbers?

Standard bearing designation numbers are alphanumeric codes that identify a bearing's type, series, bore size, and specific features like seals or internal clearance[1][2]. The basic designation typically contains three to five digits, where the final two digits represent the bore code[5][6].

How do you calculate bearing bore size from the part number?

For standard metric bearings with a bore code of 04 or higher, multiply the last two digits of the part number by five to determine the bore diameter in millimeters[2][4]. A 6205 bearing has a bore code of 05, equaling a 25 mm bore diameter[2][7].

What do the suffixes 2RS and ZZ mean on a bearing?

Suffix codes indicate specific bearing features, where 2RS denotes two rubber seals and ZZ indicates two metal shields[14][15]. Rubber seals offer superior protection against dust, while metal shields provide lower friction for high-speed machinery[14][18].

How do I measure a bearing if the part number is worn off?

Clean the bearing thoroughly, then use a digital caliper to measure the inner diameter (bore), outer diameter (OD), and width[22][20]. Match all three dimensions to a supplier catalog to identify the correct part number[20][27].

References

  1. Bearing number | Basic Bearing Knowledge. https://koyo.jtekt.co.jp/en/support/bearing-knowledge/6-3000.html (2026-07-30)
  2. Basic bearing designation system. https://www.skf.com/no/products/rolling-bearings/principles-of-rolling-bearing-selection/general-bearing-knowledge/bearing-basics/basic-bearing-designation-system (2026-08-06)
  3. 5—Bearing Designations | NSK Global. https://www.nsk.com/tools-resources/abc-bearings/bearing-designations/ (2024-07-11)
  4. Bearing data - Schaeffler mediasmedias.schaeffler.my › rolling-bearings. https://medias.schaeffler.my/en/knowledge-center/rolling-bearings/bearing-data (2010-05-01)
  5. Conventional designation of bearings according to ISO. https://ebearing.com.ua/en/content/273-umovne-poznachennya-pidshipnikiv-zgidno-sistemi-iso- (2025-11-03)
  6. Understanding the Bearing Designation System - codex.si. https://www.codex.si/blog/understanding-the-bearing-designation-system/ (2025-05-21)
  7. Bearing Decoder Guide - toolgrit.com. https://www.toolgrit.com/guides/bearing-decoder-guide (2026-05-14)
  8. International Standard. https://cdn.standards.iteh.ai/samples/3597/9ad1cb20ebb94f46a8b5b5d4c83154d2/ISO-15-1981.pdf (2025-03-25)
  9. BEARING AND LINEAR REFERENCE GUIDE. https://www.nsk.com/content/dam/nsk/am/en_us/documents/bearings-americas/Bearing-and-Linear-Reference-Guide.pdf (2026-07-22)
  10. [PDF] BEARING DESIGNATION SYSTEMS - NSK Ltd.. https://www.nsk.com/content/dam/nsk-marketing/projects-completed/literature/service/bearing-designation-systems_bochure/en_bearing-designation-systems_bochure/preview-pdf_bearing-designation-systems_bochure_en/EN_Bearing_Designation_Systems_BD_03_2024_low-res.pdf (2026-08-10)
  11. Complete Guide (6000, 6200, 6300 Series). https://blogs.lntbearings.com/how-to-read-a-bearing-number-complete-guide-6000-6200-6300-series/ (2026-03-26)
  12. Understanding ANSI, ISO, and ASTM Standards for Bearings. https://www.nbcbearings.com/understanding-ansi-iso-and-astm-standards-for-bearings/ (2024-05-17)
  13. How to Read & Identify Bearing Numbers: A Complete Guide - Bearing Maker. https://www.bearingmaker.com/how-to-read-identify-bearing-numbers-a-complete-guide/ (2025-07-15)
  14. How to Choose Bearing ZZ, 2RS, Open, and C3? Complete Guide to .... https://iskbearing.com/news/knowledge/bearing-zz-2rs-open-c3-selection-guide (2026-06-26)
  15. Designation system - SKF. https://www.skf.com/us/products/rolling-bearings/ball-bearings/deep-groove-ball-bearings/designation-system (2026-07-21)
  16. Bearing suffixes explained. https://reliance.ie/en-ie/bearing-suffixes-explained (2024-08-16)
  17. Bearing Numbers Explained: How to Read Bearing Codes and Part Numbers - MBY Bearing. https://www.mby-bearings.com/bearing-numbers-explained-how-to-read-bearing-codes-and-part-numbers/ (2026-07-28)
  18. How to Read a Bearing Number — BearingBrain. https://bearingbrain.com/guides/how-to-read-bearing-numbers (2026-07-20)
  19. How to Read a Bearing Size Chart: Bore Codes & Suffixes. https://www.lily-bearing.com/resources/blog/how-to-read-bearing-size-chart (2026-07-27)
  20. How Do You Measure a Bearing? A Step-by-Step Guide. https://www.andebearing.com/blog/how-to-measure-a-bearing (2026-05-13)
  21. How to Measure a Bearing. https://www.lily-bearing.com/resources/blog/how-to-measure-a-bearing (2026-07-02)
  22. How to Measure Bearings. https://blog.igus.ca/2021/04/15/how-to-measure-bearings/ (2021-04-15)
  23. How to measure bore diameter. https://www.smbbearings.com/how-to-measure-bore-diameter (2026-06-06)
  24. The Ultimate Guide To Measuring Bearing Sizes | AUBEARING. https://www.aubearing.com/the-ultimate-guide-to-measuring-bearing-sizes/ (2023-12-13)
  25. How to Measure a Bearing. https://simplybearings.co.uk/shop/Info-Pages-How-to-Measure-a-Bearing/c4746_4972/index.html (2004-01-01)
  26. Ball bearings size chart. https://www.mrosupply.com/blog/ball-bearings-size-chart/ (2026-08-11)
  27. Faq. https://pibsales.com/tutorials/how-to-measure-the-key-dimensions-in-identifying-bearings/ (2022-07-08)