70. 72. 718. 719 SERIES

Image may differ from product. See technical specification for details.

Standard

GB,ASTM/AISI,ГОСТ,BS,JIS,NF,DIN / VDEh,DIN / VDEh

Inner ring diameter

10mm-280mm

Outer ring diameter

20mm-400mm

Weight

0.2kg-300kg

Material

GCr15, 52100, 100Cr6, SUJ2, Stainless Steel, German High Nitrogen Stainless Steel CRONIDUR30, Ceramic

Brand

QIBR/OEM/Neutral

Package

QIBR/Standard Industrial Package/OEM

Applications

Machine tool spindle, centrifuge, booster pump, oil pump, blower, various gearboxes, laboratory equipment

Pairing method

DB, DF, DT, DBD, DBB, SU

70. 72. 718. 719 SERIES

Filters

NO. Product Product Number Basic dynamic load rating Basic static load rating Inner diameter (d) Mass Outer diameter (D) Width (B)
207 QHCB7204C/ QHCB7204C 10.00 KN 5.60 KN 20 mm 0.09 kg 47 mm 14 mm
208 QHCB7204E/ QHCB7204E 9.65 KN 5.40 KN 20 mm 0.09 kg 47 mm 14 mm
209 QB71805C/ QB71805C 4.15 KN 3.20 KN 25 mm 0.02 kg 37 mm 7 mm
210 QB71805E/ QB71805E 3.90 KN 3.00 KN 25 mm 0.02 kg 37 mm 7 mm
211 QHCB71805C/ QHCB71805C 2.85 KN 2.24 KN 25 mm 0.02 kg 37 mm 7 mm
212 QHCB71805E/ QHCB71805E 2.70 KN 2.12 KN 25 mm 0.02 kg 37 mm 7 mm
213 QB71905C/ QB71905C 8.15 KN 5.70 KN 25 mm 0.04 kg 42 mm 9 mm
214 QB71905E/ QB71905E 7.80 KN 5.50 KN 25 mm 0.04 kg 42 mm 9 mm
215 QHCB71905C/ QHCB71905C 5.60 KN 4.00 KN 25 mm 0.04 kg 42 mm 9 mm
216 QHCB71905E/ QHCB71905E 5.30 KN 3.80 KN 25 mm 0.04 kg 42 mm 9 mm
217 QXCB71905C/ QXCB71905C 12.50 KN 4.00 KN 25 mm 0.04 kg 42 mm 9 mm
218 QXCB71905E/ QXCB71905E 11.80 KN 3.80 KN 25 mm 0.04 kg 42 mm 9 mm
219 QHS71905C/ QHS71905C 4.25 KN 3.35 KN 25 mm 0.05 kg 42 mm 9 mm
220 QHS71905E/ QHS71905E 4.00 KN 3.15 KN 25 mm 0.05 kg 42 mm 9 mm
221 QHC71905C/ QHC71905C 2.90 KN 2.36 KN 25 mm 0.05 kg 42 mm 9 mm
222 QHC71905E/ QHC71905E 2.75 KN 2.20 KN 25 mm 0.05 kg 42 mm 9 mm
223 QXC71905C/ QXC71905C 6.40 KN 2.36 KN 25 mm 0.05 kg 42 mm 9 mm
224 QXC71905E/ QXC71905E 6.10 KN 2.20 KN 25 mm 0.05 kg 42 mm 9 mm
225 QB7005C/ QB7005C 14.60 KN 9.15 KN 25 mm 0.08 kg 47 mm 12 mm
226 QB7005E/ QB7005E 13.70 KN 8.65 KN 25 mm 0.08 kg 47 mm 12 mm
227 QHCB7005C/ QHCB7005C 10.00 KN 6.30 KN 25 mm 0.06 kg 47 mm 12 mm
228 QHCB7005E/ QHCB7005E 9.50 KN 6.00 KN 25 mm 0.06 kg 47 mm 12 mm
229 QXCB7005C/ QXCB7005C 22.40 KN 6.30 KN 25 mm 0.06 kg 47 mm 12 mm
230 QXCB7005E/ QXCB7005E 21.20 KN 6.00 KN 25 mm 0.06 kg 47 mm 12 mm
231 QHS7005C/ QHS7005C 6.30 KN 4.90 KN 25 mm 0.09 kg 47 mm 12 mm
232 QHS7005E/ QHS7005E 6.00 KN 4.65 KN 25 mm 0.09 kg 47 mm 12 mm
233 QHC7005C/ QHC7005C 4.30 KN 3.45 KN 25 mm 0.09 kg 47 mm 12 mm
234 QHC7005E/ QHC7005E 4.05 KN 3.25 KN 25 mm 0.09 kg 47 mm 12 mm
235 QXC7005C/ QXC7005C 9.65 KN 3.45 KN 25 mm 0.09 kg 47 mm 12 mm
235 QB7205C/ QB7205C 15.60 KN 9.30 KN 25 mm 0.12 kg 52 mm 15 mm
236 QB7205E/ QB7205E 15.00 KN 9.00 KN 25 mm 0.12 kg 52 mm 15 mm
237 QHCB7205C/ QHCB7205C 10.80 KN 6.55 KN 25 mm 0.11 kg 52 mm 15 mm
238 QHCB7205E/ QHCB7205E 10.40 KN 6.20 KN 25 mm 0.11 kg 52 mm 15 mm
239 QB71806E/ QB71806E 4.15 KN 3.40 KN 30 mm 0.03 kg 42 mm 7 mm
240 QB71806C/ QB71806C 4.40 KN 3.65 KN 30 mm 0.03 kg 42 mm 7 mm
241 QHCB71806C/ QHCB71806C 3.05 KN 2.55 KN 30 mm 0.03 kg 42 mm 7 mm
242 QHCB71806E/ QHCB71806E 2.85 KN 2.40 KN 30 mm 0.03 kg 42 mm 7 mm
243 QB71906C/ QB71906C 8.65 KN 6.55 KN 30 mm 0.05 kg 47 mm 9 mm
244 QB71906E/ QB71906E 8.15 KN 6.30 KN 30 mm 0.05 kg 47 mm 9 mm
245 QHCB71906C/ QHCB71906C 6.00 KN 4.65 KN 30 mm 0.04 kg 47 mm 9 mm
246 QHCB71906E/ QHCB71906E 5.60 KN 4.40 KN 30 mm 0.04 kg 47 mm 9 mm
247 QXCB71906C/ QXCB71906C 13.4 KN 4.65 KN 30 mm 0.04 kg 47 mm 9 mm
248 QXCB71906E/ QXCB71906E 12.50 KN 4.40 KN 30 mm 0.04 kg 47 mm 9 mm
249 QHS71906C/ QHS71906C 6.40 KN 5.20 KN 30 mm 0.05 kg 47 mm 9 mm
250 QHS71906E/ QHS71906E 6.00 KN 4.90 KN 30 mm 0.05 kg 47 mm 9 mm
251 QHC71906C/ QHC71906C 4.40 KN 3.65 KN 30 mm 0.05 kg 47 mm 9 mm
252 QHC71906E/ QHC71906E 4.15 KN 3.45 KN 30 mm 0.05 kg 47 mm 9 mm
253 QXC71906C/ QXC71906C 9.80 KN 3.65 KN 30 mm 0.05 kg 47 mm 9 mm
254 QXC71906E/ QXC71906E 9.30 KN 3.45 KN 30 mm 0.05 kg 47 mm 9 mm
255 QB7006C/ QB7006C 15.00 KN 10.20 KN 30 mm 0.11 kg 55 mm 13 mm
256 QB7006E/ QB7006E 14.30 KN 9.80 KN 30 mm 0.11 kg 55 mm 13 mm
257 QHCB7006C/ QHCB7006C 10.40 KN 7.20 KN 30 mm 0.10 kg 55 mm 13 mm
258 QHCB7006E/ QHCB7006E 10.00 KN 6.80 KN 30 mm 0.10 kg 55 mm 13 mm
259 QXCB7006C/ QXCB7006C 23.20 KN 7.20 KN 30 mm 0.10 kg 55 mm 13 mm
260 QXCB7006E/ QXCB7006E 22.40 KN 6.80 KN 30 mm 0.10 kg 55 mm 13 mm
261 QHS7006C/ QHS7006C 8.80 KN 7.10 KN 30 mm 0.13 kg 55 mm 13 mm
262 QHS7006E/ QHS7006E 8.30 KN 6.70 KN 30 mm 0.13 kg 55 mm 13 mm
263 QHC7006C/ QHC7006C 6.00 KN 6.90 KN 30 mm 0.12 kg 55 mm 13 mm
264 QHC7006E/ QHC7006E 5.70 KN 4.65 KN 30 mm 0.12 kg 55 mm 13 mm
265 QXC7006C/ QXC7006C 13.40 KN 4.90 KN 30 mm 0.12 kg 55 mm 13 mm
266 QXC7006E/ QXC7006E 12.70 KN 4.65 KN 30 mm 0.12 kg 55 mm 13 mm
267 QB7206C/ QB7206C 23.20 KN 14.60 KN 30 mm 0.19 kg 62 mm 16 mm
268 QB7206E/ QB7206E 22.00 KN 14.00 KN 30 mm 0.19 kg 62 mm 16 mm
269 QHCB7206C/ QHCB7206C 16.00 KN 10.20 KN 30 mm 0.17 kg 62 mm 16 mm
270 QHCB7206E/ QHCB7206E 15.30 KN 9.80 KN 30 mm 0.17 kg 62 mm 16 mm
271 QB71807C/ QB71807C 4.65 KN 4.15 KN 35 mm 0.03 kg 47 mm 7 mm
272 QB71807E/ QB71807E 4.40 KN 3.80 KN 35 mm 0.03 kg 47 mm 7 mm
273 QHCB71807C/ QHCB71807C 3.20 KN 2.85 KN 35 mm 0.03 kg 47 mm 7 mm
274 QHCB71807E/ QHCB71807E 3.00 KN 2.65 KN 35 mm 0.03 kg 47 mm 7 mm
275 QB71907C/ QB71907C 11.80 KN 9.50 KN 35 mm 0.07 kg 55 mm 10 mm
276 QB71907E/ QB71907E 11.00 KN 9.00 KN 35 mm 0.07 kg 55 mm 10 mm
277 QHCB71907C/ QHCB71907C 8.15 KN 6.55 KN 35 mm 0.06 kg 55 mm 10 mm
278 QHCB71907E/ QHCB71907E 7.65 KN 6.30 KN 35 mm 0.06 kg 55 mm 10 mm
279 QXCB71907C/ QXCB71907C 18.00 KN 6.55 KN 35 mm 0.06 kg 55 mm 10 mm
280 QXCB71907E/ QXCB71907E 17.00 KN 6.30 KN 35 mm 0.06 kg 55 mm 10 mm
281 QHS71907C/ QHS71907C 6.95 KN 6.20 KN 35 mm 0.08 kg 55 mm 10 mm
282 QHS71907E/ QHS71907E 6.55 KN 5.85 KN 35 mm 0.08 kg 55 mm 10 mm
283 QHC71907C/ QHC71907C 4.80 KN 4.40 KN 35 mm 0.08 kg 55 mm 10 mm
284 QHC71907E/ QHC71907E 4.50 KN 4.05 KN 35 mm 0.08 kg 55 mm 10 mm
285 QXC71907C/ QXC71907C 10.80 KN 4.40 KN 35 mm 0.08 kg 55 mm 10 mm
286 QXC71907E/ QXC71907E 10.00 KN 4.05 KN 35 mm 0.08 kg 55 mm 10 mm
287 QB7007C/ QB7007C 19.00 KN 13.70 KN 35 mm 0.15 kg 62 mm 14 mm
288 QB7007E/ QB7007E 18.30 KN 12.90 KN 35 mm 0.15 kg 62 mm 14 mm
289 QHCB7007C/ QHCB7007C 13.20 KN 9.50 KN 35 mm 0.13 kg 62 mm 14 mm
290 QHCB7007E/ QHCB7007E 12.50 KN 9.00 KN 35 mm 0.13 kg 62 mm 14 mm
291 QXCB7007C/ QXCB7007C 29.00 KN 9.50 KN 35 mm 0.13 kg 62 mm 14 mm
292 QXCB7007E/ QXCB7007E 28.00 KN 9.00 KN 35 mm 0.13 kg 62 mm 14 mm
293 QHS7007C/ QHS7007C 9.30 KN 8.30 KN 35 mm 0.17 kg 62 mm 14 mm
294 QHS7007E/ QHS7007E 8.80 KN 7.80 KN 35 mm 0.17 kg 62 mm 14 mm
295 QHC7007C/ QHC7007C 6.40 KN 5.85 KN 35 mm 0.17 kg 62 mm 14 mm
296 QHC7007E/ QHC7007E 6.10 KN 5.40 KN 35 mm 0.17 kg 62 mm 14 mm
297 QXC7007C/ QXC7007C 14.30 KN 5.85 KN 35 mm 0.17 kg 62 mm 14 mm
298 QXC7007E/ QXC7007E 13.70 KN 5.40 KN 35 mm 0.17 kg 62 mm 14 mm
299 QB7207C/ QB7207C 25.50 KN 18.00 KN 35 mm 0.28 kg 72 mm 17 mm
300 QB7207E/ QB7207E 24.50 KN 17.00 KN 35 mm 0.28 kg 72 mm 17 mm
301 QHCB7207C/ QHCB7207C 17.60 KN 8.80 KN 35 mm 0.24 kg 72 mm 17 mm
302 QHCB7207E/ QHCB7207E 16.60 KN 8.50 KN 35 mm 0.24 kg 72 mm 17 mm
303 QB71808C/ QB71808C 4.80 KN 4.55 KN 40 mm 0.03 kg 52 mm 7 mm
304 QB71808E/ QB71808E 4.55 KN 4.25 KN 40 mm 0.03 kg 52 mm 7 mm
305 QHCB71808C/ QHCB71808C 3.35 KN 3.15 KN 40 mm 0.03 kg 52 mm 7 mm

QIBR precision angular contact ball bearings offer solutions to enhance bearing rigidity, reduce noise and vibration, improve high-speed performance, and extend service life

  • QIBR precision angular contact ball bearings achieve significantly improved rigidity by using a larger number of large ceramic balls and a design with a larger groove curvature radius coefficient, which greatly increases the bearing's preload.

  • Noise and Vibration Reduction: To reduce bearing noise and vibration, the bearing raceway waviness and surface roughness are optimized, and a lightweight cage with optimized guided clearance is used.

  • Reliability and Longevity: The bearings are made from high-purity bearing steel, and the reliability and longevity are enhanced through austenite grain and carbide size refinement during the bearing blank processing. This greatly improves the contact fatigue life of the bearing. The surfaces of the inner and outer raceways undergo vacuum ion nitriding treatment, significantly enhancing the bearing's wear resistance.

  • High-Speed Performance: For high-speed applications, such as the QIBR QHCG... series bearings, a super high-speed design is used, with a speed factor DmN value of up to 3 million (oil-air lubrication) and 2 million (grease lubrication).

QIBR Precision Angular Contact Ball Bearings

High-speed precision angular contact ball bearings are available in various precision grades: standard precision is ISO Class 4 (ABEC 7), P4A (dimensional accuracy of ISO Class 4 with rotational accuracy higher than ISO Class 4), and ISO Class 2 (ABEC 9)

QIBR Precision Angular Contact Ball Bearings Preload Methods and Characteristics

Angular contact ball bearing axial preload can be categorized into two types based on the method of applying preload: positional preload and constant pressure preload.

  • Positional Preload: Positional preload refers to a method where the axial position of the bearing remains relatively unchanged during use. The required preload can be achieved by adjusting the width of the spacer between two bearings. Another approach involves grinding a certain amount of pre-deformation on the end faces of the inner or outer rings of a matched pair of bearings, achieving preload upon installation. Positional preload significantly enhances the rigidity of the bearing support system.

  • Constant Pressure Preload: Also known as constant force preload, this method ensures that the axial preload of the bearing remains constant during operation. The preload is achieved by adjusting the compression of a spring. Compared to positional preload, constant pressure preload is less effective at improving the axial rigidity of the support system under the same preload. However, with positional preload, the thermal expansion of the shaft and changes in radial clearance caused by temperature differences between the inner and outer rings can affect the amount of preload deformation, while constant pressure preload does not have these issues. Generally, positional preload is preferred when high rigidity is required, whereas constant pressure preload is more suitable for high-speed applications.

QIBR Precision Angular Contact Ball Bearing Pairing

To enhance bearing load capacity and rigidity, angular contact ball bearings used in machine tool spindles are typically employed in pairs or groups. Common methods include duplex or multi-bearing arrangements. When pairing bearings, the following performance parameters must be controlled between any two bearings:

  1. The difference in average inner and outer diameters between any two precision angular contact ball bearings.

  2. The difference in radial runout of the inner and outer rings between any two precision angular contact ball bearings.

  3. The difference in actual contact angles between any two precision angular contact ball bearings.

  4. The difference in protrusion between adjacent precision angular contact ball bearings.