Summary of NSK Bearing Rear Code Names (2)
Source: China Bearing Network | Date: January 23, 2014
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(5) Ferrule Shape:
- K: Tapered bore with a taper of 1:12.
- K30: Tapered bore with a taper of 1:30.
- E: Has a cut or oil hole.
- E4: Outer ring with an oil groove and oil hole.
- N: Outer ring with a stop groove.
- NR: Outer ring with a stop groove and a retaining ring.
(6) Mounting and Spacing:
- DB: Back-to-back mounting.
- DF: Face-to-face mounting.
- DT: Series mounting.
- +K: Outer ring with spacers.
- +L: Inner ring with spacers.
- +KL: Both inner and outer rings with spacers.
(7) Radial Clearance:
- C1: Smaller radial clearance than C2.
- C2: Smaller radial clearance than the standard.
- CN: Standard radial clearance.
- C3: Larger radial clearance than standard.
- C4: Larger radial clearance than C3.
- C5: Larger radial clearance than C4.
- CC1: Non-interchangeable cylindrical roller bearing with smaller clearance than CC2.
- CC2: Non-interchangeable cylindrical roller bearing with smaller clearance than standard.
- CC: Non-interchangeable cylindrical roller bearing with standard clearance.
- CC3: Non-interchangeable cylindrical roller bearing with larger clearance than standard.
- CC4: Non-interchangeable cylindrical roller bearing with larger clearance than CC3.
- CC5: Non-interchangeable cylindrical roller bearing with larger clearance than CC4.
- MC1: Small ball bearings with smaller clearance than MC2.
- MC2: Small ball bearings with smaller clearance than MC3.
- MC3: Small ball bearings with standard clearance.
- MC4: Small ball bearings with larger clearance than MC3.
- MC5: Small ball bearings with larger clearance than MC4.
- MC6: Small ball bearings with larger clearance than MC5.
- CM: Deep groove ball bearings for motor applications.
- CT: Cylindrical roller bearings for motor applications.
(8) Precision Grades:
- P0: Standard precision, meets JIS 0 level.
- P6: Meets JIS 6 level.
- P6X: Meets JIS 6X level.
- P5: Meets JIS 5 level.
- P4: Meets JIS 4 level.
- P2: Meets JIS 2 level.
(9) Special Standards:
- X26: Suitable for temperatures below 150°C.
- X28: Suitable for temperatures below 200°C.
- X29: Suitable for temperatures below 250°C.
- S11: Spherical roller bearings suitable for temperatures below 200°C.
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Globe Valve
The globe valve is used to cut off the flow of the medium. The globe valve is suitable for frequently opened occasions. The sealing parts of the globe valve are the disc and the valve seat. In order to make the globe valve close tightly, the mating surface of the disc and the valve seat should be grinding or using gaskets. The sealing surface can also be inset with bronze, stainless steel and other corrosion-resistant and wear-resistant materials. The disc and stem of the globe valve are connected with each other, so that the disc and stem are closely fitted. The lifting of the disc of the globe valve is generally controlled by the stem. The upper part of the stem of the globe valve is the handwheel, and the middle part is the thread and packing sealing section. The role of the packing is to prevent the internal medium of the valve body from leaking along the stem.
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