{"id":13228,"date":"2026-03-19T22:33:31","date_gmt":"2026-03-19T14:33:31","guid":{"rendered":"https:\/\/www.zmsbearing.com\/?p=13228"},"modified":"2026-03-19T22:33:38","modified_gmt":"2026-03-19T14:33:38","slug":"numeros-de-rolamentos-de-esferas-de-contacto-angular-um-guia-completo-para-designacoes-sufixos-amp-selecao","status":"publish","type":"post","link":"https:\/\/www.zmsbearing.com\/pt\/angular-contact-ball-bearing-numbers-a-complete-guide-to-designations-suffixes-amp-selection\/","title":{"rendered":"N\u00fameros de rolamentos de esferas de contacto angular: Um guia completo para designa\u00e7\u00f5es, sufixos e sele\u00e7\u00e3o"},"content":{"rendered":"\n

Angular contact ball bearings<\/em><\/strong><\/a> handle both radial and axial loads at high speeds\u2014think CNC spindles, gearboxes, pumps, and electric motors. But the cryptic numbers on the bearing (like 7205BEP<\/strong> or 7211-B-MP-P5-UA<\/strong>) aren’t random. They encode everything from size and contact angle to cage material and precision class.<\/p>\n\n\n\n

Before the blog, we want to introduce us as a professional angular contact ball bearings supplier<\/em><\/strong><\/a> in China for 15 years.<\/p>\n\n\n\n

Mastering the numbering system saves time, money, and downtime. Here’s how to decode them step by step.<\/p>\n\n\n\n

\"Anguar<\/figure>\n\n\n\n
\"Angular<\/figure>\n\n\n\n

Above:<\/strong> Cross-section views of single-row angular contact ball bearings. The contact angle (\u03b1) between the ball and raceway determines axial load capacity\u2014higher angles (e.g., 40\u00b0) handle more thrust.<\/p>\n\n\n\n

1. Why Angular Contact Bearings (and Their Numbers) Matter<\/h2>\n\n\n\n

Unlike deep-groove ball bearings (which handle mostly radial loads), angular contact designs have offset raceways. This creates a contact angle (usually 15\u00b0\u201340\u00b0) that lets them support combined loads and tilting moments.<\/p>\n\n\n\n

They are almost always used in pairs (back-to-back DB<\/strong>, face-to-face DF<\/strong>, or tandem DT<\/strong>) for rigidity and bidirectional axial loads.<\/p>\n\n\n\n

The designation system follows ISO standards but with manufacturer-specific suffixes. Major brands (SKF, NSK, FAG, NTN) use similar basic codes but vary in suffix meanings\u2014always check the catalog!<\/p>\n\n\n\n

2. Breaking Down the Basic Designation (The Numbers)<\/h2>\n\n\n\n

Most single-row angular contact ball bearings follow this format:<\/p>\n\n\n\n

7<\/strong> [Dimension Series] [Bore Code]<\/p>\n\n\n\n

7<\/strong> = Single-row angular contact ball bearing
Dimension Series<\/strong> (next digit):
0 = 70 series (extra light)
2 = 72 series (light)
3 = 73 series (medium)
Bore Code<\/strong> (last two digits): Bore diameter in mm.<\/p>\n\n\n\n

00 = 10 mm
01 = 12 mm
02 = 15 mm
03 = 17 mm
04 and up = code \u00d7 5 mm (e.g., 05 = 25 mm, 06 = 30 mm)<\/p>\n\n\n\n

Example:<\/strong> 7205<\/strong><\/p>\n\n\n\n

7 = angular contact
2 = light series
05 = 25 mm bore<\/p>\n\n\n\n

\"Angular<\/figure>\n\n\n\n
\"Angular<\/figure>\n\n\n\n

Above:<\/strong> Official NSK and Schaeffler (FAG) designation charts. The “7” type code and bore multiplier (\u00d75) are universal across brands.<\/p>\n\n\n\n

3. Contact Angle Suffixes (The Most Important Letter)<\/h2>\n\n\n\n

The contact angle directly affects load capacity and speed:<\/p>\n\n\n\n

Code<\/th>Contact Angle<\/th>Typical Use<\/th>Axial Load Capacity<\/th><\/tr><\/thead>
C<\/td>15\u00b0<\/td>High speed, low axial<\/td>Low<\/td><\/tr>
A \/ A5 \/ E<\/td>25\u201330\u00b0<\/td>Balanced loads<\/td>Medium<\/td><\/tr>
B<\/td>40\u00b0<\/td>High axial \/ thrust<\/td>High<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Examples across brands:<\/strong><\/p>\n\n\n\n

NSK 7205A<\/strong> = 30\u00b0
NTN \/ SKF \/ FAG 7205B<\/strong> = 40\u00b0
FAG 7211B<\/strong> = 40\u00b0<\/p>\n\n\n\n

Higher angles = more thrust capacity but slightly lower speed limits.<\/p>\n\n\n\n

\"Angular<\/figure>\n\n\n\n

Above:<\/strong> NSK diagram showing how contact angle codes (C, A5, A, B) change radial vs. axial capacity and limiting speeds.<\/p>\n\n\n\n

4. Common Suffixes (Cage, Precision, Preload & Arrangement)<\/h2>\n\n\n\n

After the basic number come letters\/numbers that customize the bearing:<\/p>\n\n\n\n

Cage<\/strong><\/p>\n\n\n\n

M \/ MP \/ L1 = Machined brass (high speed\/temperature)
P \/ T \/ T1 = Polyamide \/ phenolic (lightweight, quiet)
J = Pressed steel<\/p>\n\n\n\n

Precision \/ Tolerance<\/strong><\/p>\n\n\n\n

P5 \/ P4 \/ P2 = ISO classes (higher = tighter tolerances for spindles)
Equivalent to ABEC 5\/7\/9<\/p>\n\n\n\n

Preload \/ Clearance<\/strong><\/p>\n\n\n\n

GA \/ L \/ EL = Light preload (universal mount)
C3 \/ C4 = Greater internal clearance<\/p>\n\n\n\n

Arrangement (for pairs)<\/strong><\/p>\n\n\n\n

DB = Back-to-back (highest rigidity)
DF = Face-to-face
DT = Tandem
UA \/ U = Universal (can be mounted any way)<\/p>\n\n\n\n

Other<\/strong><\/p>\n\n\n\n

E \/ XL = Optimized internal design or X-life (longer life)
2RS \/ ZZ = Seals or shields<\/p>\n\n\n\n

Full real-world example (SKF):<\/strong> 7211 BECBM<\/strong><\/p>\n\n\n\n

72 = light series, 11 = 55 mm bore
B = 40\u00b0 contact angle
E = optimized raceways
CB=Bearing for universal matching. Two bearings arranged back-to-back or face-to-face have Normal axial internal clearance.
M = Machined brass cage, ball centred; different designs are identified by a number following the M, e.g. M2<\/p>\n\n\n\n

\"Angular<\/figure>\n\n\n\n

Above:<\/strong> Real SKF angular contact bearings (e.g., 7312 BECBM style) with visible cages and markings.<\/p>\n\n\n\n

5. Quick Selection Tips Using the Number<\/h2>\n\n\n\n

Match bore to your shaft (e.g., 7206 = 30 mm).
Choose contact angle by load: 40\u00b0 for heavy thrust (pumps), 15\u201325\u00b0 for high-speed spindles.
Pairs are standard\u2014look for DB\/DF\/DT or UA suffix.
Precision: P4\/P5 for machine tools; normal for general industry.
Always verify speed, load ratings, and grease in the manufacturer’s catalog (SKF, NSK, NTN, FAG).<\/p>\n\n\n\n

6. Common Applications<\/h2>\n\n\n\n

CNC machine tool spindles
Automotive transmissions & wheel hubs
Centrifugal pumps & compressors
Robotics and high-speed gearboxes
Electric motors and generators<\/p>\n\n\n\n

Conclusion: Read the Number, Avoid the Headache<\/h2>\n\n\n\n

The next time you see 7205 BEP<\/strong> or 7211-B-XL-MP-P5-UA<\/strong>, you’ll know exactly what you’re getting\u2014bore size, contact angle, precision, and mounting style in one glance.<\/p>\n\n\n\n

If you still have confusion on this, please feel free to contact us<\/em><\/strong><\/a>, we can help you in this.<\/p>\n","protected":false},"excerpt":{"rendered":"

Angular contact ball bearings handle both radial and axial loads at high speeds\u2014think CNC spindles, gearboxes, pumps, and electric motors. But the cryptic numbers […]<\/p>\n","protected":false},"author":4,"featured_media":13222,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-13228","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bearing-basic"],"uagb_featured_image_src":{"full":["https:\/\/www.zmsbearing.com\/wp-content\/uploads\/Anguar-contact-ball-bearing-number-11.jpg",745,497,false],"thumbnail":["https:\/\/www.zmsbearing.com\/wp-content\/uploads\/Anguar-contact-ball-bearing-number-11-150x150.jpg",150,150,true],"medium":["https:\/\/www.zmsbearing.com\/wp-content\/uploads\/Anguar-contact-ball-bearing-number-11-300x200.jpg",300,200,true],"medium_large":["https:\/\/www.zmsbearing.com\/wp-content\/uploads\/Anguar-contact-ball-bearing-number-11.jpg",745,497,false],"large":["https:\/\/www.zmsbearing.com\/wp-content\/uploads\/Anguar-contact-ball-bearing-number-11.jpg",745,497,false],"1536x1536":["https:\/\/www.zmsbearing.com\/wp-content\/uploads\/Anguar-contact-ball-bearing-number-11.jpg",745,497,false],"2048x2048":["https:\/\/www.zmsbearing.com\/wp-content\/uploads\/Anguar-contact-ball-bearing-number-11.jpg",745,497,false],"trp-custom-language-flag":["https:\/\/www.zmsbearing.com\/wp-content\/uploads\/Anguar-contact-ball-bearing-number-11-18x12.jpg",18,12,true]},"uagb_author_info":{"display_name":"Emily lee","author_link":"https:\/\/www.zmsbearing.com\/pt\/author\/zms-bearings\/"},"uagb_comment_info":0,"uagb_excerpt":"Angular contact ball bearings handle both radial and axial loads at high speeds\u2014think CNC spindles, gearboxes, pumps, and electric motors. But the cryptic numbers […]","_links":{"self":[{"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/posts\/13228","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/comments?post=13228"}],"version-history":[{"count":0,"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/posts\/13228\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/media\/13222"}],"wp:attachment":[{"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/media?parent=13228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/categories?post=13228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zmsbearing.com\/pt\/wp-json\/wp\/v2\/tags?post=13228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}