Double-row ball slewing ring Archives | ZZ https://www.precisionslewingbearing.com/product-category/double-row-ball-slewing-ring/ Mon, 18 Aug 2025 02:47:32 +0000 en-US hourly 1 https://wordpress.org/?v=6.9 https://www.precisionslewingbearing.com/wp-content/uploads/2018/09/cropped-icon-apple-32x32.png Double-row ball slewing ring Archives | ZZ https://www.precisionslewingbearing.com/product-category/double-row-ball-slewing-ring/ 32 32 ZZ Double Row Ball Slewing Bearing for Excavators https://www.precisionslewingbearing.com/product/zz-double-row-ball-slewing-bearing-for-excavators/ Mon, 18 Aug 2025 01:27:10 +0000 https://www.precisionslewingbearing.com/?post_type=product&p=53257 The ZZ double row ball slewing bearing is designed for heavy-duty engineering machinery where higher load capacity and stability are required. Featuring two rows of precision steel balls, this bearing can handle combined axial, radial, and tilting moment loads simultaneously, making it ideal for excavators, truck cranes, tower cranes, and concrete pump trucks.

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]]> The ZZ double row ball slewing bearing is engineered for heavy-duty applications requiring higher load capacity and stability. With two rows of precision steel balls, it can simultaneously bear substantial axial, radial, and overturning loads. This makes it ideal for excavators, truck cranes, tower cranes, and concrete pump trucks where safety and reliability are critical.

ZZ double row slewing bearings feature high-strength alloy steel construction, advanced heat treatment, and precision-ground raceways. The dual-row design distributes loads more evenly, reducing wear and extending service life. Optional gear teeth configurations allow seamless integration with hydraulic or electric drive systems.

Sealed designs protect against dust, mud, and water, while internal lubrication ensures smooth operation with minimal maintenance. The robust structure maintains stability even under shock loads common in mining, construction, or port machinery.

　 Dimensions Fixing Holes Structure Size Gear data External gear data Internal gear data
Code Curva D
(mm)		 d
(mm)		 H
(mm)		 D1
(mm)		 D2
(mm)		 dn1
dn2
(mm)		 dm1
dm2
(mm)		 L
(mm)		 n  n1 H1
(mm)		 h
(mm)		 b
(mm)		 m
(mm)		 da
(mm)  		 z  da
(mm)  		 z
02.25.500 1 616 384 106 580 420 18 M16 32 20 4 96 26 60 5
6		 644
646.8		 126
105		 357
350.4		 72
59
02.25.560 2 676 444 106 640 480 18 M16 32 20 4 96 26 60 5
6		 704
706.8		 138
115		 417
410.4		 84
69
02.25.630 3 746 514 106 710 550 18 M16 32 24 4 96 26 60 6
8		 790.8
790.4		 129
96		 482.4
475.2		 81
60
02.25.710 4 826 594 106 790 630 18 M16 32 24 4 96 26 60 6
8		 862.8
862.4		 141
105		 560.4
555.2		 94
70
02.30.800 5 942 658 124 898 702 22 M20 40 30 6 114 29 80 8
10		 982.4
988		 120
96		 619.2
614		 78
62
02.30.900 6 1042 758 124 998 802 22 M20 40 30 6 114 29 80 8
10		 1086.4
1088 		 133
106		 715.2
714		 90
72
02.30.1000 7 1142 858 124 1098 902 22 M20 40 36 6 114 29 80 10
12		 1198
1197.6		 117
97		 814
796.8		 82
67
02.30.1120 8 1262 978 124 1218 1022 22 M20 40 36 6 114 29 80 10
12		 1318
1317.6		 129
107		 924
916.8		 93
77
02.40.1250 9 1426 1074 160 1374 1126 26 M24 48 40 5 150 39 90 12
14		 1497.6
1495.2		 122
104		 1012.8
1013.6		 85
73
02.40.1400 10 1576 1224 160 1524 1276 26 M24 48 40 5 150 39 90 12
14		 1641.6
1649.2		 134
115		 1156.8
1153.6		 97
83
02.40.1600 11 1776 1424 160 1724 1476 26 M24 48 45 5 150 39 90 14
16		 1845.2
1852.8		 129
113		 1349.6
1350.4		 97
85
02.40.1800 12 1976 1624 160 1924 1676 26 M24 48 45 5 150 39 90 14
16		 2055.2
2060.8		 144
126		 1545.6
1542.4		 111
97
02.50.2000 13 2215 1785 190 2149 1851 33 M30 60 48 8 178 47 120 16
18		 2300.8
2300.4		 141
125		 1702.4
1699.2		 107
95
02.50.2240 14 2455 2025 190 2389 2091 33 M30 60 48 8 178 47 120 16
18		 2540.8
2552.4		 156
139		 1942.4
1933.2		 122
108
02.50.2500 15 2715 2285 190 2649 2351 33 M30 60 56 8 178 47 120 18
20		 2804.4
2816		 153
138		 2203.2
2188		 123
110
02.50.2800 16 3015 2585 190 2949 2651 33 M30 60 56 8 178 47 120 18
20		 3110.4
3116		 170
153		 2491.2
2488		 139
125
02.60.3150 17 3428 2872 226 3338 2962 45 M42 84 56 8 214 56 150 20
22		 3536
3537.6		 174
158		 2768
2758.8		 139
126
02.60.3550 18 3828 3272 226 3738 3362 45 M42 84 56 8 214 56 150 20
22		 3936
3933.6		 194
176		 3168
3176.8		 159
145
02.60.4000 19 4278 3722 226 4188 3812 45 M42 84 60 10 214 56 150 22
25		 4395.6
4395		 197
173		 3616.8
3610		 165
145
02.60.4500 20 4778 4222 226 4688 4312 45 M42 84 60 10 214 56 150 22
25		 4879.6
4895		 219
193		 4122.8
4110		 188
165

Widely used in aerial work platforms, rotary drilling rigs, and shield tunneling machines, these bearings deliver precision, durability, and confidence in every rotation. ISO-certified production and rigorous quality control guarantee ZZ bearings meet global standards for engineering machinery.

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]]> Teeth Harden Slewing Ring Turntable Bearing For Tower Crane https://www.precisionslewingbearing.com/product/turntable-bearing-for-tower-crane/ Wed, 24 Nov 2021 03:39:22 +0000 http://www.precisionslewingbearing.com/?post_type=product&p=20695 Slewing bearings play a key role in tower crane design, enabling smooth rotation and precise positioning. As the core component of the tower crane, the slewing bearing ensures the stability of the superstructure and enables the hook and load to move accurately. Its high load capacity and compact design allow the tower crane to operate more efficiently in tight building spaces while meeting the heavy lifting needs of construction sites. The weather resistance and stability of the slewing bearing are also brought into play under various weather conditions. Regular maintenance ensures the reliability of the slewing bearing and ensures the safety and performance of the tower crane operation. Overall, slewing bearings provide important support for tower crane operations on construction sites by providing a reliable rotation mechanism, promoting efficient construction projects.

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]]> Turntable bearings play a critical role in the functionality of tower cranes, which are commonly used in construction for lifting and transporting heavy loads. The turntable bearing, also known as a slewing bearing, enables the rotation of the crane’s upper structure, including the jib and counter-jib, providing the crane with the ability to swing and position loads precisely.

 

Anti-rust treatment of slewing bearings and gears

You can select online or contact technical engineering to help you.

No. Curve Dimensions Fixing Holes Gear Parameter Load N.W
(kg)
De
(mm)		 de
(mm)		 di
（mm）		 Di
（mm）		 Dx
（mm）		 He
（mm）		 Hi
（mm）		 Ht
（mm）		 Hd
（mm）		 Fe
(mm）		 Fi
（-）		 N V
(mm）		 L W
（-）		 m
（mm）		 Z
（-）		 xm
（mm）		 Dp
（mm）		 fznorm
(KN)		 fzmax
(KN)
ZZ-SL-W.20.307 1 432 309 305 224 394 83 83 92 50 360 254 16 17 25 12 6 70 - 420 20.4 40.8 51
ZZ-SL-W.20.383 2 504 385 381 300 466 83 83 92 75 436 330 16 17 25 12 8 61 - 488 40.8 81.6 64
ZZ-SL-W.25.475 3 595 477 473 382 565 88 88 98 50 540 410 24 17 25 14 5 117 - 585 17 34 85
ZZ-SL-W.25.575 4 712 577 573 470 670 88 88 98 75 640 508 24 17 25 9 8 87 - 696 40.8 81.6 123
ZZ-SL-W.20.752 5 864 754 750 678 833 83 83 92 76 800 706 36 17 25 9 6 142 - 852 31.01 62.02 114
ZZ-SL-W.25.821 6 979 823 819 718 935 92 92 102 86 893 753 36 21 31 15 10 94 +11 940 70.63 141.26 200
ZZ-SL-W.20.968 7 1080 970 966 893 1042 83 83 92 76 1015 922 30 17 25 10 8 133 - 1064 41.34 82.69 148
ZZ-SL-W.25.1077 8 1200 1079 1075 976 1163 88 88 98 77 1135 1012 36 19 - - 8 148 - 1184 41.89 83.78 210
ZZ-SL-W.30.1215 9 1380 1218 1212 1095 1330 98 98 108 90 1290 1135 48 23 34 16 10 136 - 1360 61.2 122.4 325
ZZ-SL-W.20.383 1 504 385 381 300 394 83 83 92 75 436 330 16 17 25 12 8 61 - 488 48 96 64
ZZ-SL-W.25.475 2 614.4 477 473 378 565 88 88 98 80 540 410 24 19 28 14 8 74 +4 592 51.2 102.4 98
ZZ-SL-W.25.575 3 695 577 573 470 670 83 83 92 58 640 508 30 17 25 13 5 136 +2.5 680 23.2 46.4 104
ZZ-SL-W.25.980 4 1144 982 978 870 1096 96 96 110 88 1050 910 36 21 31 12 10 111 +8 1110 85.02 170.05 262
ZZ-SL-W.30.1117 5 1289 1120 1114 985 1240 98 98 108 83 1198 1035 40 21 31 18 10 125 +10.5 1250 80.19 160.39 332
ZZ-SL-W.30.1215 6 1380 1218 1212 1095 1330 98 98 108 90 1290 1135 36 23 34 16 10 136 - 1360 72 144 334
ZZ-SL-W.30.1249 7 1476 1252 1246 1085 1415 101 101 110 89 1350 1150 48 26 37 23 10 144 +8.6 1440 85.99 171.98 502
ZZ-SL-W.35.1249 1 1472 1252 1246 1085 1406 134 134 144 115 1350 1150 36 28 41 27 14 102 +9.1 1428 147.78 295.56 640
ZZ-SL-W.30.1391 2 1603 1394 1388 1208 - 110 110 120 110 1500 1280 40 29 - 　 10 157 +7.5 1570 100.97 201.93 636
ZZ-SL-W.40.1402 3 1604 1405 1399 1208 1570 138 134 148 93 1500 1280 48 31 46 24 10 157 +7 1570 147.78 295.56 710
ZZ-SL-W.25.1391 4 1605 1394 1388 1208 1550 116 116 130 96 1494 1280 48 29 41 22 12 130 +12 1560 105.74 211.48 623
ZZ-SL-W.40.1390 5 1634 1393 1387 1208 - 138 134 148 138 1500 1280 48 31 46 24 14 113 +14 1582 177.33 354.67 800
ZZ-SL-W.30.1578 6 1808 1581 1575 1404 - 110 110 120 110 1680 1476 40 29 - - 10 178 +5 1780 100.97 201.93 754
ZZ-SL-W.35.1578 7 1805 1581 1575 1433 - 140 140 156 140 1671 1485 60 28 41 15 16 109 +16.9 1744 205.6 411.21 810

ZZ is famous for its rich 20 years of slewing bearing production experience. As an important player in the industry, ZZ focuses on the design and manufacturing of slewing bearing products. The company’s long experience has given it deep expertise in delivering high-quality, reliable solutions. ZZ’s slewing bearing products are widely used in many fields, including construction, heavy industry, wind energy and medical equipment. The company focuses on innovation and provides customers with customized solutions to meet the needs of different applications.

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