290 Series - Dimcogray 4-prong thru hole knob
| Part N° | Material | Unit system | Fastening gender | A | B | C | D | Thread length | Thread size |
| 2-290-302 | Phenolic | Imperial | Female | 2-1/4 | 1-1/8 | 1 | 9/16 | 5/8 | 3/8-24 |
| 2-290-303 | Phenolic | Imperial | Female | 2-1/4 | 1-1/8 | 1 | 9/16 | 5/8 | 1/2-13 |
| 2-290-304 | Phenolic | Imperial | Female | 2-1/4 | 1-1/8 | 1 | 9/16 | 5/8 | 1/2-20 |
| 2-290-308 | Phenolic | Imperial | Female | 2-1/4 | 1-1/8 | 1 | 9/16 | 5/8 | 1/4-28 |
| 2-290-309 | Phenolic | Imperial | Female | 2-1/4 | 1-1/8 | 1 | 9/16 | 5/8 | 1/2-20 |
| 2-290-310 | Phenolic | Imperial | Female | 2-1/4 | 1-1/8 | 1 | 9/16 | 5/8 | 5/16-18 |
| 2-290-311 | Phenolic | Imperial | Female | 2-1/4 | 1-1/8 | 1 | 9/16 | 5/8 | 1/4-20 |
| 2-290-312 | Phenolic | Imperial | Female | 2-1/4 | 1-1/8 | 1 | 9/16 | 5/8 | 3/8-16 |