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BEARING NUMBER CODE REFERENCE

Interchange – Single Row Ball Bearings

  Description NSK SKF Torr / Faf FAG MRC
P/N Inch Rxx Rxx Sxx Rxx Rxx
Extra small 6xx 6xx 3x 6xx 3x
Extra light 60xx 60xx 91xxK 60xx 1xxK
Light 62xx 62xx 2xx 62xx 2xxS
Medium 63xx 63xx 3xx 63xx 3xxS
Extra thin section 68xx 618xx 618xx
Very thin section 69xx 619xx 93xxK 619xx
Thin section 16xxx 16xxx 16xxx
Maximum capacity, light BL2xx 2xx 2xxW 2xx 2xxM
Maximum capacity, medium BL3xx 3xx 3xxW 3xx 3xxM
Suffix Two seals (contact) DDU 2RS PP 2RSR ZZ
One seal (contact) DU RS P RSR Z
Two shields ZZ 2Z DD 2ZR FF
One shield Z Z D ZR F
Snap ring NR NR G NR G
Steel cage BLANK J BLANK BLANK BLANK
Brass Cage M M MBR M BRZ
Heat stabilized 200C X28 S1 S1
Tight clearance C2 C2 H C2 Tight
Normal clearance BLANK BLANK R BLANK Normal
Loose clearance C3 EM(C3) P C3 Loose
Extra loose clearance C4 C4 J C4 Extra Loose
Electric motor grade E QE6


Interchange – Double Row Ball Bearings

  Description NSK SKF Torr / Faf MRC
P/N Self-aligning, extra narrow 12xx 12xx
Self-aligning, narrow 133xx 13xx
Self-aligning, wide 22xx 22xx
Self-aligning, extra wide 23xx 23xx
Double row, maximum compliment, light 32xx 52xxE 52xxW 52xxM (K)
Double row, max. compliment, medium 33xx 53xxE 53xxW 53xxM (K)
Double row, conrad, light 52xx 52xxA 52xxK 52xxC(SBK)
Double row, conrad, medium 53xx 53xxA 53xxK 53xxC (SB)
Suffix Two seals 2RS 2RS1
Two shields ZZ 2Z FF
Snap ring NR NR G G
polyamide cage TNG TN9 pRB
Steel cage J BLANK BLANK BLANK
Tapered bore K K
Extra capacity E E
Tight clearance C2 C2 H C2
Normal clearance BLANK BLANK R BLANK
Loose clearance C3 C3 p C3
Extra loose clearance C4 C4 J C4


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

  Description NSK SKF Torr / Faf FAG MRC
P/N Light 72xx 72xx 72xx 72xx 72xx
Medium 73xx 73xx 73xx 73xx 73xx
Heavy 74xx 74xx 74xx 74xx 74xx
Suffix 40 deg. contact B B WN B pJ
30 deg. contact A BLANK
25 deg. contact A5 ACD E
15 deg. contact C CD C R
Machined brass cage M M MBR Mp BRZ
pressed brass cage Y Y BLANK Yp
polyamide cage TY p pRC TVp BKE
Steel cage W J Jp BLANK
Flush ground faces G G BLANK UO,UA DU
petrochemical BMpC BECBM pumppac*


Glossary – Cylindrical Roller Bearings

  • NU style single row – NU style bearings have two machined flanges on the outer ring and no flanges on the inner ring.
  • N Style single row – N style bearings have two machined flanges on the inner ring and no flanges on the outer ring, with rollers and cage on the inner ring. Like the NU style, the N has no thrust load carrying capability.
  • NJ style single row – NJ style bearings have two machined flanges on the outer ring and a machined flange on one side of the inner ring. The roller and cage assembly is in the outer ring. The integral flange on the inner ring allows this bearing to carry an axial load.
  • NF style single row – NF style bearings have two machined flanges on the inner ring and one flange on the outer ring, with roller and cage on the inner ring. Like the NJ bearing, these bearings have some thrust load capability.
  • NH style single row – NH style bearings have two machined flanges on the outer ring and a machined flange on one side of the inner ring. A special-design inner ring allows use of a stabilizing ring on the non-flange side. As a result, these bearings can carry axial loads in both directions. The roller and cage assembly is mounted in the outer ring.
  • NUP style single row – NUP style bearings are similar to the NJ style and come with a special ring often called a thrust collar. Mounted on the non-flange side of the inner ring, the thrust collar allows the bearing to carry an axial load in both directions. The thrust collar extends out of the bearing on one side, so the dimension across the inner ring is slightly greater than that of the outer ring.
  • Double row styles (NN, NNU) – Double Row cylindrical roller bearings are denoted by two N’s within the part number (e.g., NN or NNU). The dimensions for these can be found in the Super Precision section of this catalog and can be ordered with standard precision.
  • S-Type – Sealed-Clean Bearings for chain conveyors demonstrate a high efficiency under high temperatures and wet conditions for a longer period with an improved sealing system. These bearings are packed with a quality grease of high thermal resistance and durability.
  • Continuous Caster Roller Bearings – 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.
  • Four Row Cylindrical Roller Bearings – Are also popular roll neck bearings providing several benefits. First, the inner ring is separable form the outer ring and rollers which allows the inner ring to remain with the roll during grinding processes. This assures precise concentricity and negligible run-out providing for high rolling accuracy. Secondly, this design allows for greater radial load carrying and higher operating speeds. Four row cylindricals must be used in combination with a thrust bearing which is usually a two row taper, angular contact ball bearings, or a deep groove ball bearing depending on the thrust load present.


Interchange – Cylindrical Roller Bearings

  Description NSK SKF FAG
Prefix Single row, no flanges on outer ring N N N
Single row, no flanges on inner ring NU NU NU
Single row, 1 flange inner NJ NJ NJ
Single row, 1 flange outer NF NF
Single row, 1 flange inner, with retaining ring NUP NUP NUP
Single row, 1 flange inner w/stabalizing ring NH NH NH
Double row, flanges outer/flanges inner HJ HJ HJ
  NNU/NN NNU/NN NNU/NN
P/N Light 2XX 2XX 2XX
Medium 3XX 3XX 3XX
Heavy 4XX 4XX 4XX
Extra Light 10XX 10XX 10XX
Light, Wide 22XX 22XX 22XX
Medium, Wide 23XX 23XX 23XX
Suffix Ployamide cage T P TVP2
Composite high temp (200°C) cage T7
Machined brass cage M M M,M1
Pressed steel cage W,WS J JP1
High capacity design E EC E
Full complement (no cage) V V V
Tight clearance C2 C2 C2
Normal clearance BLANK BLANK BLANK
Loose clearance C3 C3 C3
Extra loose clearance C4 C4 C4


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 temperture 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

  Description NSK SKF Torr/FAF FAG
P/N Very Light 239xx 239xx 239xx 239xx
Light 230xx 230xx 230xx 230xx
Light, Wide 240xx 240xx 240xx 240xx
Medium 231xx 231xx 231xx 231xx
Medium, Wide 241xx 241xx 241xx 241xx
Heavy 222xx 222xx 222xx 222xx
Heavy, Wide 232xx 232xx 232xx 232xx
Extra Heavy 213xx 213xx 213xx 213xx
Extra Heavy, Wide 223xx 223xx 223xx 223xx
Suffix Bronze case, one piece, guide ring CAM,AM CA,CACM YM M
Bronze cage, two piece, guide flange M MC BR MB
Steel cage, two piece, guide ring C,CD CJ,CC CJ, VJ BLANK
Polyamide cage, two piece H VCF TVPB
Tapered bore 1:12 K K K K
Tapered bore 1:30 K30 K30 K K30
Carburized steel, complete bearing g ECD W40 W209
Carburized steel, inner ring only g3 ECB W401 W209B
Lube groove & holes outer ring E4 W33 W33 S
Lube groove & holes outer ring, holes inner ring E7 W513 W33W94 Sheading0AB
Holes only outer ring E3 W20 W20 SY
Holes only inner ring E5 W26 W94 heading0AB
No relube features BLANK BLANK BLANK
Plugs provided for outer ring holes E42 W77 W84 heading0
Combination W33, W4, W31 E4P53 W507 W33W4W31
Combination W33, W31 E4U22 W506 W33W31
Combination W33, W26, W31 E7U22 W509 W33W94W31 Sheading0A
Outer ring w/extra close running accuracy P52 C04 C04 T52BN
Inner ring w/extra close running accuracy P53 C02 C02 T52BE
Inner & outer ring w/extra close running accuracy P55 C08 C08 T52BW
Special inspection measures U22 W31 W31
Inner ring & outer ring heat stabilized to 200°C S11 S1
Tight clearance C2 C2 C2 C2
Normal clearance BLANK BLANK BLANK BLANK
Loose clearance C3 C3 C3 C3
Extra loose clearance C4 C4 C4 C4


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

  Description NSK SKF Timken FAG
Prefix Extra heavy EH EH EH KEH
Heavier than heavy HH HH HH KHH
Heavy H H H KH
Heavy medium HM HM HM KHM
Medium M M M KM
Light medium LM LM LM KLM
Light L L L KL
Lighter than light LL LL LL KLL
Extra light EL EL EL KEL
Cup Angle 0° to 23°59’59.99 1xxxx 1xxxx 1xxxx 1xxxx
24° to 25°29’59.99 2xxxx 2xxxx 2xxxx 2xxxx
25°30′ to 26°59’59.99 3xxxx 3xxxx 3xxxx 3xxxx
27° to 28°29’59.99 4xxxx 4xxxx 4xxxx 4xxxx
28°30′ to 30°29’59.99 5xxxx 5xxxx 5xxxx 5xxxx
30°30′ to 32°29’59.99 6xxxx 6xxxx 6xxxx 6xxxx
32°30′ to 35°59’59.99 7xxxx 7xxxx 7xxxx 7xxxx
36° to 44°59’59.99 8xxxx 8xxxx 8xxxx 8xxxx
45° up, but not thrust only conforms to AFBMA standard case carburized cup & cone 9xxxx 9xxxx 9xxxx 9xxxx
  R      
  G      


Interchange – Metric Tapered Roller Bearings

  Description NSK SKF Timken FAG
P/N High capacity design HR
Light HR302xx 302xx 302xx 302xx
Medium HR303xx 303xx 303xx 303xx
Medium, steep angle HR303xxD 313xx 313xx 313xx
Extra light, wide HR329xx 329xx 329xx 329xx
very light, wide HR320xx 320xx 320xx 320xx
Light, wide HR322xx 322xx 322xx 322xx
Medium, wide HR323xx 323xx 323xx 323xx
Very light, extra wide HR330xx 330xx 330xx 330xx
Light, extra wide HR331xx 331xx 331xx 331xx
Medium, extra wide HR332xx 332xx 332xx 332xx
Suffix Medium contact angle C B B B
Steep contact angle D
Modified internal design X X X X
Conforms to ISO 355 J A