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High Precision Ball Screw Support Bearings
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Ball screw support bearings performance
1.ZYS precision Ball screw support bearing is a kind of one-direction angular contact thrust ball bearing (60° contact angle) with high accuracy, high speed, high axial rigidity, low friction, long life and transient high/low speed conversion. The bearing is particularly suitable for the ball screw support and similar transmitting components in high-speed precision CNC machine tools.
Ball screw support bearings
ZYS precision ball screw support bearings including four series: 7602, 7603, BS, BSS. The standard7602 and 7603 series correspond to Chinese Mechanical standard, with the bore diameters from 12mm to 130mm; BS series are non-standard metric and BSS series are inch series.
Ball screw support bearings can support larger axial load in one direction and a certain radial load. These bearings are usually arranged in duplex or multiple sets with the same arranging modes as the way of angular contact ball bearings.
2.Sealed ball screw support bearings
In order to meet the developing trend of smaller machine tool with more compact structure, ZYS developed sealed ball screw support bearings. The seals at both ends of bearing can prevent cutting fluid and metal scrap into the bearing.
Sealed ball screw support bearings
3.Ball screw support bearings units
ZYS ball screw support bearings units refer to combining matched bearings and relevant
accessories together into ball screw support components, with simple mounting, convenient use, reliable operation and such features.
According to the different bearings arranging modes, ZYS ball screw support bearing units have three types: BSDU……DF, BSTU……TFT and BSQU……QFC.
4.The preload and axial rigidity of high precision ball screw support bearings
The preload and axial rigidity of high precision ball screw support bearings (Standard Metric)
Bearing designation ZYS | Preload Fa0 | Axial rigidity Ra | Bearing designation ZYS | Preload Fa0 | Axial rigidity Ra |
KN | N/µm | KN | N/µm | ||
760201TN1 | 1.4 | 470 | 760304TN1 | 2.9 | 780 |
760202TN1 | 1.4 | 510 | 760305TN1 | 3.3 | 910 |
760203TN1 | 1.7 | 590 | 760306TN1 | 4.3 | 1070 |
760204TN1 | 2.3 | 700 | 760307TN1 | 4.8 | 1190 |
760205TN1 | 2.5 | 770 | 760307X3TN1 | 5.6 | 1290 |
760206TN1 | 2.9 | 890 | 760308TN1 | 5.6 | 1290 |
760207TN1 | 3.3 | 1020 | 760309TN1 | 7.0 | 1470 |
760208TN1 | 4.3 | 1180 | 760309X3TN1 | 7.6 | 1600 |
760209TN1 | 4.5 | 1240 | 760310TN1 | 7.6 | 1600 |
760210TN1 | 4.9 | 1360 | 760311TN1 | 8.8 | 1720 |
760211TN1 | 4.6 | 1390 | 760312TN1 | 10.0 | 1840 |
760212TN1 | 6.5 | 1620 | 760313TN1 | 12.0 | 2050 |
760213TN1 | 7.0 | 1750 | 760314TN1 | 12.0 | 2100 |
760214TN1 | 7.0 | 1750 | 760315TN1 | 14.5 | 2330 |
760215TN1 | 7.6 | 1880 | 760316TN1 | 16.0 | 2460 |
760216TN1 | 8.9 | 2040 | 760317TN1 | 17.5 | 2530 |
760217TN1 | 10.5 | 2200 | 760318TN1 | 18.0 | 2650 |
760218TN1 | 11.0 | 2270 | 760319TN1 | 19.0 | 2770 |
760219TN1 | 12.5 | 2430 | 760320TN1 | 21.5 | 2960 |
760220TN1 | 14.0 | 2590 | 760322TN1 | 29.3 | 3360 |
760222TN1 | 16.4 | 2800 | 760324TN1 | 31.3 | 3550 |
760224TN1 | 20.6 | 3130 | 760326TN1 | 33.7 | 3800 |
760226TN1 | 20.6 | 3280 |
5.Tolerances of shaft and housing fit for ball screw support bearings
Tolerances of shaft fit for ball screw support bearings (µm)
Shaft diameter d(?) | From Up to | 10 18 | 18 30 | 30 50 | 50 80 | 80 120 | 120 180 | 180 250 | 250 315 |
Tolerance | Upper deviation | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Lower deviation | -8 | -9 | -11 | -13 | -15 | -18 | -20 | -23 | |
Cylindricity | t1 | 2 | 2.5 | 2.5 | 3 | 4 | 5 | 7 | 8 |
Flatness | t2 | 1.2 | 1.5 | 1.5 | 2 | 2.5 | 3.5 | 4.5 | 6 |
End face runnout | t3 | 2 | 2.5 | 2.5 | 3 | 4 | 5 | 7 | 8 |
Roughness on surface | Ra | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.8 | 0.8 |
Tolerances of housing fit for ball screw support bearings (µm)
Housing diameter D(?) | From Up to | 18 30 | 30 50 | 50 80 | 80 120 | 120 180 | 180 250 | 250 315 | 315 400 |
Tolerance | Upper deviation | +8 | +10 | +13 | +16 | +18 | +22 | +25 | +29 |
Lower deviation | -5 | -6 | -6 | -6 | -7 | -7 | -7 | -7 | |
Cylindricity | t1 | 2.5 | 2.5 | 3 | 4 | 5 | 7 | 8 | 9 |
Flatness | t2 | 2.5 | 2.5 | 3 | 4 | 5 | 7 | 8 | 9 |
End face runnout | t3 | 4 | 4 | 5 | 6 | 8 | 10 | 12 | 13 |
Roughness on surface | Ra | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 1.6 | 1.6 |
6.Comparison table of bearing designations between ZYS and other manufacturers
Bearing types | ZYS | SNFA | FAG | SKF | NSK | GMN | FAFNIR | RHP |
Angular contact ball bearing | 718 | SEA | ||||||
719 | SEB | B719 | 719 | 79 | S619 | 93W1 | 79 | |
70 | EX | B70 | 70 | 70 | S60 | 91W1 | 70 | |
72 | E200 | B72 | 72 | 72 | S62 | 2W1 | 72 | |
H719 | VEB | HS719 | BNC19 | 993WN | S79 | |||
H70 | VEX | HS70 | 70CC | BNC10 | SH60 | 991WN | S70 | |
| B719-2RZ | HSS719 | |||||||
| B70-2RZ | HSS70 | |||||||
| B70 | SN60 | 91WO | ||||||
Cylindrical roller bearing | N1OK | N10K | N10AK | N10KR | ||||
| NN30K | NN30K | NN30K | NN30KR | |||||
2344 | 2344 | 2344 | TAC20X | |||||
| 2347 | 2347 | 2347 | ||||||
70A/DB | BA10X | |||||||
| 70B/DB | BA10X | |||||||
Tapered roller bearing | 320 | 320X | 320X | |||||
7602 | BS200 | 7602 | BSA2 | TAC02 | ||||
| 7603 | 7603 | BSA3 | TAC03 | |||||
| BS | BSB | BSD | TAC | |||||
| BSS | BDAB | TAC |
Luoyang Bearing has been engaged in high precision ball screw support bearings since 1958, and we are known as one of the leading bearing manufacturers and suppliers for our quality products and excellent services. Please rest assured to buy the good products from our factory.
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