This chart lists the industry standard I/O module case names, dimensions, and the corresponding Brentek International case type. This information is derived from the Industry Case Compatibility Chart in Brentek International's Catalog 500. It has been augmented with the names of the major manufacturers of each I/O case designation.
| Industry Standard | Manufacturers | I/O Case Dimensions (H x W x D) | Brentek Case Type |
| Single (OAC5, etc) (0.6") | Opto 22 Crydom Potter & Brumfield Philips ECG |
1.25 x 1.7 x 0.6 inches 31.8 x 43.2 x 15.2 mm |
Standard 0.6" |
| 0.6" Series | Crouzet Gordos | ||
| 70 Types | Grayhill | ||
| SM (0.4") Types | Crouzet Gordos |
1.0 x 1.7 x 0.4 inches 25.4 x 43.2 x 10.2 mm |
SM Type |
| M (0.4) Types | Crouzet Gordos Crydom Potter & Brumfield Philips ECG |
1.0 x 1.7 x 0.4 inches 25.4 x 43.2 x 10.2 mm |
M Type |
| 70M Type | Grayhill | ||
| G-Series | Brentek |
1.64 x 1.92 x 0.48 inches 41.7 x 48.8 x 12.2 mm |
G-Series |
| G4 Types | Opto 22 | ||
| C4 Types | Crouzet Gordos |
||
| G5 Types | Grayhill | ||
| 70G Types | Grayhill | ||
| Gx2™ Dual | Brentek |
1.64 x 1.92 x 0.48 inches 41.7 x 48.8 x 12.2 mm |
Gx2™ - Series |
| Quad-Pak | Opto 22 |
3.12 x 2.42 x 1.06 inches 80 x 62 x 27 mm |
QUAD |
| QUAD | Crouzet Gordos |
||
| 8 Pin Octal | Brentek |
1.5 x 2 x 2 inches 38.1 x 50.8 x 50.8 mm |
P8 Series |