NI USB-622x/625x/628x OEM User Guide 4 ni.com
Figure 3 shows the dimensions of the USB-6225/6229/6255/6259/6289 OEM device.

Figure 3. USB-6225/6229/6255/6259/6289 OEM Dimensions in Inches (Millimeters)

0.436 (11.07)
0.392 (9.96)
0.362 (9.19)
0.162 (4.11)
0.062 (1.57)
0.000 (0.00)
0.396 (10.06)
0.304 (7.72)
0.256 (6.50)
0.116 (2.95)
0.000 (0.00)
6.950 (176.53)
4x 6.718 (170.63)
6.270 (159.26)
6.140 (155.96)
5.930 (150.62)
5.839 (148.31)
5.499 (139.67)
0.000 (0.00)
0.200 (5.08)
2.072 (52.63)
3.296 (83.72)
6.200 (157.48)
6.400 (162.56)
0.000 (0.00)
6.400 (162.56)
0.393 (9.98) 0.200 (5.08)
0.918 (23.32)
3.734 (94.84)
3.730 (94.74)
3.180 (80.77)
3.220 (81.79)
3.198 (81.22)
6.013 (152.74)
5.900 (149.86)
5.210 (132.33)
0.390 (9.91)
1.057 (26.85)
1.750 (44.45)
2.300 (58.42)
2.606 (66.19)
3.080 (78.23)
0.200 (5.08)
5.290 (134.37)
6.140 (155.96)
0.304 (7.72)
2X Ø 0.140 Cutout
in Panel for LEDs
Ø 0.330 Cutout in Panel
for Power Connector
7X Ø 0.125 (3.18)
4X Ø 0.110 (2.79)
0.515 (13.08)
0.609 (15.47)
0.442 (11.23)