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ASME/ANSI B18.25.3M:1998 Metric Parallel Key
ASME/ANSI B18.25.3M:1998 Metric Parallel Key features a metric parallel key structure under the ASME/ANSI system, making it suitable for shaft-hub connections requiring metric standardized torque transmission.
The key sits between the shaft keyway and hub keyway and transmits torque through its side faces; the design is simple to maintain and convenient for standardized spare parts. This structure supports efficient assembly while balancing joint stability, load distribution, and convenient maintenance, making it practical for standardized purchasing and volume production.
This product can be used in motors, pumps, fans, gearboxes, sprockets, and industrial transmission systems. Metric size, material strength, chamfer, and rust-resistant finish can be selected to meet requirements for corrosion protection, wear resistance, assembly efficiency, and long-term reliability.
Dimensions unit: inch
|
Specification |
2 |
3 |
4 |
5 |
6 |
5 |
6 |
8 |
8 |
10 |
10 |
12 |
12 |
14 |
||
|
Type |
Square |
Square |
Square |
Square |
Square |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
||
|
b |
Min. |
2 |
3 |
4 |
5 |
6 |
5 |
6 |
8 |
8 |
10 |
10 |
12 |
12 |
14 |
|
|
Max. |
2.04 |
3.04 |
4.045 |
5.045 |
6.045 |
5.045 |
6.045 |
8.05 |
8.05 |
10.05 |
10.05 |
12.075 |
12.075 |
14.075 |
||
|
h |
Min. |
2 |
3 |
4 |
5 |
6 |
3 |
4 |
5 |
7 |
6 |
8 |
6 |
8 |
6 |
|
|
Max. |
2.04 |
3.04 |
4.045 |
5.045 |
6.045 |
3.16 |
4.175 |
5.175 |
7.19 |
6.175 |
8.19 |
6.175 |
8.19 |
6.175 |
||
|
s |
Min. |
0.16 |
0.16 |
0.16 |
0.25 |
0.25 |
0.25 |
0.25 |
0.25 |
0.25 |
0.4 |
0.4 |
0.4 |
0.4 |
0.4 |
|
|
Max. |
0.25 |
0.25 |
0.25 |
0.4 |
0.4 |
0.4 |
0.4 |
0.4 |
0.4 |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
||
|
L |
6~20 |
6~36 |
8~45 |
10~56 |
14~70 |
10~56 |
14~70 |
18~90 |
18~90 |
22~110 |
22~110 |
28~140 |
28~140 |
36~160 |
||
|
Specification |
14 |
16 |
16 |
18 |
18 |
20 |
20 |
22 |
22 |
25 |
25 |
28 |
28 |
32 |
||
|
Type |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
||
|
b |
Min. |
14 |
16 |
16 |
18 |
18 |
20 |
20 |
22 |
22 |
25 |
25 |
28 |
28 |
32 |
|
|
Max. |
14.075 |
16.075 |
16.075 |
18.075 |
18.075 |
20.05 |
20.05 |
22.05 |
22.05 |
25.05 |
25.05 |
28.05 |
28.05 |
32.09 |
||
|
h |
Min. |
9 |
7 |
10 |
7 |
11 |
8 |
12 |
6 |
14 |
9 |
14 |
10 |
16 |
11 |
|
|
Max. |
9.19 |
7.19 |
10.19 |
7.19 |
11.21 |
8.19 |
12.21 |
6.175 |
14.21 |
9.21 |
14.19 |
10.21 |
16.28 |
11.28 |
||
|
s |
Min. |
0.4 |
0.4 |
0.4 |
0.4 |
0.4 |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
|
|
Max. |
0.6 |
0.6 |
0.6 |
0.6 |
0.6 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
||
|
L |
36~160 |
45~180 |
45~180 |
50~200 |
50~200 |
56~220 |
63~260 |
70~280 |
80~320 |
90~360 |
100~400 |
- |
- |
- |
||
|
Specification |
32 |
36 |
36 |
40 |
45 |
50 |
56 |
63 |
70 |
80 |
90 |
100 |
||
|
Type |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
Rectangle |
||
|
b |
Min. |
32 |
36 |
36 |
40 |
45 |
50 |
56 |
63 |
70 |
80 |
90 |
100 |
|
|
Max. |
32.09 |
36.09 |
36.09 |
40.09 |
45.09 |
50.09 |
56.125 |
63.125 |
70.125 |
80.125 |
90.135 |
100.135 |
||
|
h |
Min. |
18 |
12 |
20 |
22 |
25 |
28 |
32 |
32 |
36 |
40 |
45 |
50 |
|
|
Max. |
18.28 |
12.28 |
20.28 |
22.28 |
25.28 |
28.28 |
32.31 |
32.31 |
36.31 |
40.31 |
45.31 |
50.31 |
||
|
s |
Min. |
0.6 |
1 |
1 |
1 |
1 |
1 |
1.6 |
1.6 |
1.6 |
2.5 |
2.5 |
2.5 |
|
|
Max. |
0.8 |
1.2 |
1.2 |
1.2 |
1.2 |
1.2 |
2 |
2 |
2 |
3 |
3 |
3 |
||
|
L |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
||
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