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Here is a bunch of cross-reference material to help you find what you are looking for. Much of this information was harvested from the NSK, Timken/Torrington, and McMaster-Carr websites.
One way to categorize bearings is by the type of rolling element they use. Using this method, there are five types of 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 | -- | -- | -- |
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 |
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* |
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 |
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 |
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 |
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 |
Description | NSK | SKF | FAG | |
---|---|---|---|---|
P/N | Single direction | 511xx | 511xx | 511xx |
Single direction | 512xx | 512xx | 512xx | |
Single direction | 513xx | 513xx | 513xx | |
Single direction | 514xx | 514xx | 514xx | |
Single direction with aligning seat | 532xx | 532xx | 532xx | |
Single direction with aligning seat | 533xx | 533xx | 533xx | |
Single direction with aligning seat | 534xx | 534xx | 534xx | |
Double direction | 522xx | 522xx | 522xx | |
Double direction | 523xx | 523xx | 523xx | |
Double direction | 524xx | 524xx | 524xx | |
Double direction with aligning seat | 542xx | 542xx | 542xx | |
Double direction with aligning seat | 543xx | 543xx | 543xx | |
Double direction with aligning seat | 544xx | 544xx | 544xx | |
Suffix | Steel cage | BLANK | J | FP |
Brass cage | M | M | MP | |
Boundary dimensions adopted to ISO | X | -- | X | |
With self-aligning seat washer | U | U | U | |
ABEC 5 precision class | P5 | P5 | P5 |
Description | NSK | SKF | FAG | Torrington | |
---|---|---|---|---|---|
P/N | Light | 292xx | 292xx | 292xx | 292xx |
Medium | 293xx | 293xx | 293xx | 293xx | |
Heavy | 294xx | 294xx | 294xx | 294xx | |
Suffix | Steel Cage | H | EJ | E | EJ |
Brass Cage | M | M | EMB | EM |
Description | NSK | SKF | Torr/FAF | Seal Master | |
---|---|---|---|---|---|
Insert | Bearing, tapered bore w/adaptor, relube | UK | -- | -- | -- |
Bearing, set screw, wide ir, relube | UC | YAR2 | GCxxxxKRRB | 2-xx | |
Bearing, set screw, narrow ir, non-relube | UB | -- | -- | V | |
Bearing, ecc locking collar, narrow ir, non-relube | EN | YET2 | GRAxxxxRRB | VxxE | |
Bearing, ecc locking collar, wide ir, relube | EW | YEL2 | GxxxxKRRB | R-xxE | |
Prefix | Block, tapped-base with set screw | UCPA | -- | -- | TB |
Block, with set screw | UCP | SYxxTM | RASC | NP | |
Block, eccentric locking collar, narrow ir | ENP | SYxxFM | VAS | VPxxE | |
Block, eccentric locking collar | EWP | -- | RAS | RPxxE | |
Block, low base with set screw | UCPLL | -- | YAK | NPL | |
Block, low base w/ecc locking collar, narrow ir | ENLPL | SYHxxFM | VAK | VPLxxE | |
Block, low base w/ecc locking collar | EWPLL | SYHxxWM | RAK | RPL | |
Flange, square, with set screw | UCF | FYxxTM | RCJC | SF | |
Flange, square, with set screw | UCFX | FYMxxTM | -- | MSF | |
Flange, square, w/ecc locking collar, narrow ir | ENF | FYxxFM | VCJ | VFxxE | |
Flange, square, w/ecc locking collar | EWFH | FYxxWM | RCJ | RFxxE | |
Flange, oval, with set screw | UCFL | FYTxxTM | RCJTC | SFT | |
Flange, oval, w/ecc locking collar, narrow ir | ENFL | FYTxxFM | VCJT | VFTxxE | |
Flange, oval, w/ecc locking collar | EWFLH | FYTxxWM | RCJT | -- | |
Flange, oval, w/ecc locking collar | EWFL | -- | -- | RFTxxE | |
Flange, pressed steel, oval w/set screw | UBPFL | -- | -- | SSFT | |
Flange, pressed steel, oval w/ecc locking collar | ENPFL | FTPxxFM | RAT | SSFTxxE | |
Flange, round, cartridge w/set screw | UCFC | -- | -- | SFC | |
Flange, round, cartridge w/ecc locking collar | EWFC | -- | -- | SFCxxE | |
Flange, offset, 3 bolt w/set screw | UCFK | -- | -- | RB | |
Take-up type | T | TB | RTU | RT | |
P/N | Pressed steel cover | Z | *Y | -- | AVAIL |
Cast iron cover | C | -- | -- | -- | |
Standard series, metric | 2XX | XX | XX | S-2xx | |
Medium series, metric | 3XX | -- | -- | -- | |
Medium series, metric | Xxx | Mxx | -- | 53xx | |
Standard series, inch (see shaft size chart) | 2xx-xxS | x-x/x | x-x/x | -xx | |
Medium series, inch (see shaft size chart) | 3xx-xxS | x-x/x | x-x/x | -xx | |
Suffix | Spherical housing bore tolerance class J7 | J | |||
Inch size set screw in locking device | U | ||||
Improved set screw design | W |
*Prefix