Important Basic Wheel Bearing kits Designation step by step

Bearing is very important to our vehicles, but how to buy the right wheel bearing kits from the automotive wheel hub assembly suppliers or bearing manufacturers, it is so important to know the big brand’s basic bearing designation like NSK, SKF, FAG, SNR, SX, Ruville. Here is the introduction of the top brand bearing’s designation, NSK, SKF, FAG, ETC.

SKF wheel bearing

SKF Basic Bearing Designation

Here is the SKF Basic bearing designation, Click SKF bearing designation

Interchange – Single Row Ball Bearings

DescriptionNSKSKFTorr / FafFAGMRC
BEARING
PART
NUMBER
InchRxxRxxSxxRxxRxx
Extra small6xx6xx3x6xx3x
Extra light60xx60xx91xxK60xx1xxK
Light62xx62xx2xx62xx2xxS
Medium63xx63xx3xx63xx3xxS
Extra thin section68xx618xx618xx
Very thin section69xx619xx93xxK619xx
Thin section16xxx16xxx16xxx
Maximum capacity, lightBL2xx2xx2xxW2xx2xxM
Maximum capacity, mediumBL3xx3xx3xxW3xx3xxM
SuffixTwo seals (contact)DDU2RSPP2RSRZZ
One seal (contact)DURSPRSRZ
Two shieldsZZ2ZDD2ZRFF
One shieldZZDZRF
Snap ringNRNRGNRG
Steel cageBLANKJBLANKBLANKBLANK
Brass CageMMMBRMBRZ
Heat stabilized 200CX28S1S1
Tight clearanceC2C2HC2Tight
Normal clearanceBLANKBLANKRBLANKNormal
Loose clearanceC3EM(C3)PC3Loose
Extra loose clearanceC4C4JC4Extra Loose
Electric motor gradeEQE6

Interchange – Double Row Ball Bearings

DescriptionNSKSKFTorr / FafMRC
BEARING
PART
NUMBER
Self-aligning, extra narrow12xx12xx
Self-aligning, narrow133xx13xx
Self-aligning, wide22xx22xx
Self-aligning, extra wide23xx23xx
Double row, maximum compliment, light32xx52xxE52xxW52xxM (K)
Double row, max. compliment, medium33xx53xxE53xxW53xxM (K)
Double row, conrad, light52xx52xxA52xxK52xxC(SBK)
Double row, conrad, medium53xx53xxA53xxK53xxC (SB)
SuffixTwo seals2RS2RS1
Two shieldsZZ2ZFF
Snap ringNRNRGG
polyamide cageTNGTN9pRB
Steel cageJBLANKBLANKBLANK
Tapered boreKK
Extra capacityEE
Tight clearanceC2C2HC2
Normal clearanceBLANKBLANKRBLANK
Loose clearanceC3C3pC3
Extra loose clearanceC4C4JC4

Interchange – Angular Contact (ABEC 1 & 3) Ball Bearings

DescriptionNSKSKFTorr / FafFAGMRC
BEARING
PART
NUMBER
Light72xx72xx72xx72xx72xx
Medium73xx73xx73xx73xx73xx
Heavy74xx74xx74xx74xx74xx
Suffix40 deg. contactBBWNBpJ
30 deg. contactABLANK
25 deg. contactA5ACDE
15 deg. contactCCDCR
Machined brass cageMMMBRMpBRZ
pressed brass cageYYBLANKYp
polyamide cageTYppRCTVpBKE
Steel cageWJJpBLANK
Flush ground facesGGBLANKUO,UADU
petrochemicalBMpCBECBMpumppac*

Interchange – Cylindrical Roller Bearings

DescriptionNSKSKFFAG
PrefixSingle row, no flanges on outer ringNNN
Single row, no flanges on inner ringNUNUNU
Single row, 1 flange innerNJNJNJ
Single row, 1 flange outerNFNF
Single row, 1 flange inner, with retaining ringNUPNUPNUP
Single row, 1 flange inner w/stabalizing ringNHNHNH
Double row, flanges outer/flanges innerHJHJHJ
NNU/NNNNU/NNNNU/NN
BEARING
PART
NUMBER
Light2XX2XX2XX
Medium3XX3XX3XX
Heavy4XX4XX4XX
Extra Light10XX10XX10XX
Light, Wide22XX22XX22XX
Medium, Wide23XX23XX23XX
SuffixPloyamide cageTPTVP2
Composite high temp (200°C) cageT7
Machined brass cageMMM,M1
Pressed steel cageW,WSJJP1
High capacity designEECE
Full complement (no cage)VVV
Tight clearanceC2C2C2
Normal clearanceBLANKBLANKBLANK
Loose clearanceC3C3C3
Extra loose clearanceC4C4C4

Glossary – Spherical Roller Bearings

  • Spherical Roller Bearings – Are double row self-aligning bearings capable of carrying heavy radial loads combined with moderate thrust loads in either direction. They are extremely resistant to shock loads and their self-aligning feature allows full capacity loading despite shaft deflection.
  • Continuous Caster Rollers – These are 2-split bearing units of a highly reliable design and feature a long service life. Cylindrical roller bearings with self-aligning rings having a proper alignment function.
  • Spherical Roller Bearings TL Series – Excellent performance with high-temperature equipment. High strength to prevent inner ring fractures.
  • Shaker Screen Bearings – Are designed for vibrating applications such as screens, feeders, and compactors. These are self-aligning spherical roller bearings designed to accommodate the high loads, static and dynamic misalignment characteristics, and severe environmental conditions inherent in these applications.
  • Triple Ring Bearings – Are specially designed for use with controlled crown rolls used extensively in the paper industry. These high load capacity bearings provide “shaft within shaft” operation while simplifying the surrounding structure and installation.

Interchange – Spherical Roller Bearings

DescriptionNSKSKFTorr/FAFFAG
BEARING
PART
NUMBER
Very Light239xx239xx239xx239xx
Light230xx230xx230xx230xx
Light, Wide240xx240xx240xx240xx
Medium231xx231xx231xx231xx
Medium, Wide241xx241xx241xx241xx
Heavy222xx222xx222xx222xx
Heavy, Wide232xx232xx232xx232xx
Extra Heavy213xx213xx213xx213xx
Extra Heavy, Wide223xx223xx223xx223xx
SuffixBronze case, one piece, guide ringCAM,AMCA,CACMYMM
Bronze cage, two piece, guide flangeMMCBRMB
Steel cage, two piece, guide ringC,CDCJ,CCCJ, VJBLANK
Polyamide cage, two pieceHVCFTVPB
Tapered bore 1:12KKKK
Tapered bore 1:30K30K30KK30
Carburized steel, complete bearinggECDW40W209
Carburized steel, inner ring onlyg3ECBW401W209B
Lube groove & holes outer ringE4W33W33S
Lube groove & holes outer ring, holes inner ringE7W513W33W94Sheading0AB
Holes only outer ringE3W20W20SY
Holes only inner ringE5W26W94heading0AB
No relube featuresBLANKBLANKBLANK
Plugs provided for outer ring holesE42W77W84heading0
Combination W33, W4, W31E4P53W507W33W4W31
Combination W33, W31E4U22W506W33W31
Combination W33, W26, W31E7U22W509W33W94W31Sheading0A
Outer ring w/extra close running accuracyP52C04C04T52BN
Inner ring w/extra close running accuracyP53C02C02T52BE
Inner & outer ring w/extra close running accuracyP55C08C08T52BW
Special inspection measuresU22W31W31
Inner ring & outer ring heat stabilized to 200°CS11S1
Tight clearanceC2C2C2C2
Normal clearanceBLANKBLANKBLANKBLANK
Loose clearanceC3C3C3C3
Extra loose clearanceC4C4C4C4

Glossary – Tapered Roller Bearings

  • Four Row Tapered Roller Bearings Are very popular for use on roll necks. Most of these bearings are composed of two double cones (four Inner ring raceways), a cone spacer, two single cups (one at each end), one double cup (the center two raceways in the outer rings), and two cup spacers. They are very effective at operating under heavy radial and axial loads at low to moderate speeds. NSK four row tapered bearings are standardly supplied with carburized rings and rollers and are compatible with industry standards. “Sealed-Clean” bearings are four row tapers with seals for the harshest of operating environments. NSK’s patented design provides the optimum sealing efficiency with only a slight loss of capacity.
  • Two Row Tapered Roller Bearings Are very common as the back-up thrust bearing in a rolling mill or as the roll neck in lighter duty rolling mills. Two row tapers are designed in a variety of styles for different applications. Converging bearings (TDI, TDIE, TDIS) consist of one double cone and two single cups possibly with a cup spacer. Diverging bearings (TDO, TDOD, TDOC) consist of two single cones, a cone spacer, and one double cup.

Interchange – Inch Tapered Roller Bearings

DescriptionNSKSKFTimkenFAG
PrefixExtra heavyEHEHEHKEH
Heavier than heavyHHHHHHKHH
HeavyHHHKH
Heavy mediumHMHMHMKHM
MediumMMMKM
Light mediumLMLMLMKLM
LightLLLKL
Lighter than lightLLLLLLKLL
Extra lightELELELKEL
Cup Angle0° to 23°59’59.991xxxx1xxxx1xxxx1xxxx
24° to 25°29’59.992xxxx2xxxx2xxxx2xxxx
25°30′ to 26°59’59.993xxxx3xxxx3xxxx3xxxx
27° to 28°29’59.994xxxx4xxxx4xxxx4xxxx
28°30′ to 30°29’59.995xxxx5xxxx5xxxx5xxxx
30°30′ to 32°29’59.996xxxx6xxxx6xxxx6xxxx
32°30′ to 35°59’59.997xxxx7xxxx7xxxx7xxxx
36° to 44°59’59.998xxxx8xxxx8xxxx8xxxx
45° up, but not thrust only conforms to AFBMA standard case carburized cup & cone9xxxx9xxxx9xxxx9xxxx
R
G

Interchange – Metric Tapered Roller Bearings

DescriptionNSKSKFTimkenFAG
BEARING
PART
NUMBER
High capacity designHR
LightHR302xx302xx302xx302xx
MediumHR303xx303xx303xx303xx
Medium, steep angleHR303xxD313xx313xx313xx
Extra light, wideHR329xx329xx329xx329xx
very light, wideHR320xx320xx320xx320xx
Light, wideHR322xx322xx322xx322xx
Medium, wideHR323xx323xx323xx323xx
Very light, extra wideHR330xx330xx330xx330xx
Light, extra wideHR331xx331xx331xx331xx
Medium, extra wideHR332xx332xx332xx332xx
SuffixMedium contact angleCBBB
Steep contact angleD
Modified internal designXXXX
Conforms to ISO 355JA

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