NSK Bearing Distributor

F—Deep groove ball bearing with an integral flange outer ring (for diameters less than 10mm), e.g., F605.

HR - High Load Conical Roller Bearings, e.g., HR30207J.

NSK Bearing Back Marking Meanings

Bearings A—Internal design differs from standard bearings.

Angular Contact Ball Bearings, with a contact angle of 30 degrees.

A5 - Angular Contact Ball Bearing, Contact Angle 25°

Z, ZS - One dust cover with a steel plate.

ZZ, ZZS - Double-sided steel plate dust cover.

D, DU – a rubber seal with a contact surface.

C1 — Radial clearance of the radial bearing is smaller than that of C2.

C2 - Radial clearance for the concentric bearing, smaller than standard clearance.

CN (Omitted) - Radial Standard Clearance for Tapered Roller Bearings

C3 - Radial Clearance for Tapered Roller Bearings, larger than standard clearance.

C4 - Radial clearance for radial ball bearings, larger than C3 clearance.

Deep groove ball bearing

ZZ: Iron dust cover (same as 2Z)

VV: Non-contact Rubber Sealing Ring (Same as 2RZ)

DDU: Contact Rubber Sealing Ring (Same as 2RS)

C3/C4: Clearance

Copper Retainer

T1X: Roller Guide Nylon Resin Retainer

P5: Precision

2. Precision Ball Bearings

K: Conical hole (taper 1:12)

K30: Conical Hole (Taper 1:30)

3. Tapered Roller Bearings

EA/C/CD: Steel Retainer Bracket

CA/CAM: Copper Retainer

E4: Oiled groove (outer diameter side) with oil hole

S11: Operate below 200 degrees Celsius

K/K30: Conical bore (taper ratio of 1:12/1:30)

4. Conical Roller Bearings

C: Medium cone angle

D: Large Pitch

5. Cylindrical Roller Bearings

ET: Nylon Retainer

Copper Retainer

W: Steel Retainer Bracket

C3: Gap

Enhanced

Outer Ring Guided PPS Resin Retainer, Maximum Temperature 240 Degrees

TB: Roller Guide PPS Resin Retainer

MR: Roller Guide Copper Alloy Retainer, Maximum Temperature 300 Degrees

KR: Conical bore with a taper of 1/12 inch

E44: Outer ring with standard oil groove, oil hole

CC1: Standard Clearance for Cylindrical Internal Holes

CC0: Standard Clearance for Conical Internal Hole

CCG: Special Radial Clearance

P4/P5: Precision

6. Angular Contact Ball Bearings

A/A5/C: 30/25/15 degrees

TYN: Polyamide Resin Retainer

DB/DF/DT: Back-to-back/face-to-face/parallel

DBD/DFD/DTD: 3-Column Combination

DBB/DFF/DTT: 4-column combination

EL/L/M/H: Pre-tension Micro/Light/Medium/Heavy

P4/P5: Accuracy

7. Ball Screw Support Bearings

TAC: Contact Angle 60°

DB/DF/DT: Back-to-back/face-to-face/parallel

DBD/DFD/DTD: 3-column combination

DBB/DFF/DTT: 4-Column Combination

C10/C9: Standard Pre-tension/Light Pre-tension

PN7A/PN7B: Standard Precision/Special Management Precision equivalent to P4

8. Thrust Angular Contact Ball Bearings

TYN: Polyamide Resin Retainer

DB: Back-to-Back Combination

EL/L: Micro/Light Pre-tension

P4A: Special outer diameter tolerance, others are P4 grade.