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TOPBALL<br />
TK TYPE<br />
- TOPBALL Metric Type -<br />
TK type<br />
TK-OP type<br />
<br />
<br />
<br />
<br />
part number structure<br />
example TK 20 UU - OP - SK<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
blank: standard<br />
SK: anti-corrosion ※<br />
blank: closed<br />
OP: open<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
TK type<br />
inner contact diameter (dr)<br />
seal<br />
blank: without seal<br />
UU: seals on both sides<br />
※For anti-corrosion the load plates are electroless nickel plated with stainless steel balls.<br />
<br />
<br />
<br />
<br />
<br />
TOPBALL<br />
TK 8<br />
TK10<br />
TK12<br />
TK16<br />
TK20<br />
TK25<br />
TK30<br />
TK40<br />
TK50<br />
closed type<br />
number of<br />
ball circuits<br />
4<br />
5<br />
5<br />
5<br />
6<br />
6<br />
6<br />
6<br />
6<br />
part number<br />
mass<br />
g<br />
7.3<br />
14<br />
21<br />
43<br />
58<br />
123<br />
216<br />
333<br />
618<br />
open type<br />
number of mass<br />
ball circuits g<br />
− − −<br />
− − −<br />
TK12-OP 4 17<br />
TK16-OP 4 35<br />
TK20-OP 5 48<br />
TK25-OP 5 103<br />
TK30-OP 5 177<br />
TK40-OP 5 275<br />
TK50-OP 5 520<br />
* Based on nominal housing bore<br />
** One-sided seal is also available. Please contact NB for details.<br />
mm<br />
8<br />
10<br />
12<br />
16<br />
20<br />
25<br />
30<br />
40<br />
50<br />
dr *<br />
major dimensions<br />
D<br />
tolerance<br />
μm<br />
+ 8<br />
0<br />
+ 9<br />
− 1<br />
+11<br />
− 1<br />
+13<br />
−2<br />
mm<br />
16<br />
19<br />
22<br />
26<br />
32<br />
40<br />
47<br />
62<br />
75<br />
mm<br />
25<br />
29<br />
32<br />
36<br />
45<br />
58<br />
68<br />
80<br />
100<br />
L<br />
tolerance<br />
mm<br />
±0.2<br />
mm<br />
16.5<br />
22.0<br />
22.9<br />
24.9<br />
31.5<br />
44.1<br />
52.1<br />
60.6<br />
77.6<br />
B<br />
tolerance<br />
mm<br />
0<br />
−0.2<br />
0<br />
−0.3<br />
W<br />
mm<br />
1.1<br />
1.3<br />
1.3<br />
1.3<br />
1.6<br />
1.85<br />
1.85<br />
2.15<br />
2.65<br />
D1<br />
mm<br />
15.2<br />
18<br />
21<br />
24.9<br />
30.3<br />
37.5<br />
44.5<br />
59<br />
72<br />
h<br />
mm<br />
−<br />
−<br />
6.5<br />
9<br />
9<br />
11.5<br />
14<br />
19.5<br />
22.5<br />
θ<br />
−<br />
−<br />
66°<br />
68°<br />
55°<br />
57°<br />
57°<br />
56°<br />
54°<br />
open type<br />
F H11<br />
mm<br />
−<br />
−<br />
3<br />
5<br />
G<br />
mm<br />
−<br />
−<br />
−<br />
−<br />
−<br />
1.5<br />
2<br />
1.5<br />
2.5<br />
J<br />
mm<br />
−<br />
−<br />
0.7<br />
1.0<br />
1.0<br />
1.5<br />
1.7<br />
2.4<br />
2.7<br />
basic load rating<br />
dynamic static<br />
C Co<br />
N N<br />
423<br />
750<br />
1,020<br />
1,250<br />
2,090<br />
3,780<br />
5,470<br />
6,590<br />
10,800<br />
534<br />
935<br />
1,290<br />
1,550<br />
2,630<br />
4,720<br />
6,810<br />
8,230<br />
13,500<br />
shaft<br />
diameter<br />
mm<br />
8<br />
10<br />
12<br />
16<br />
20<br />
25<br />
30<br />
40<br />
50<br />
1N≒0.102kgf<br />
D-6 D-7
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