Inch

Model
T
A
HEX
UN-H1X10
3.18x2.16
16.3
11
UN-H2X10
6.35x3.95
21.7
16
UN-H3X10
9.53x6.35
25.9
19
UN-H4X10
12.7x9.53
30.5
24
UN-H6X10
19.05x15.8
38.5
32
UN-H8X5
25.4x22.2
45.5
41
UN-H10
31.8x28
60.7
50
UN-H12
38.0x33.7
68
60

mm

Model
T
A
HEX
UN-M3X10
3x2
16.3
11
UN-M4X10
4x3
16.3
11
UN-M6X10
6x4
21.7
16
UN-M8X10
8x6
25.9
19
UN-M10X10
10x8
23.9
19
UN-M12X10
12x10
30.5
24
UN-M19X10
19x15.8
38.5
32
UN-M25X5
25x22
45.5
41

Listed sizes are for reference only.
“T” indicates OD and ID of tube.