238 Series - Dimcogray tapered knob knob
| Part N° | Material | Unit system | Fastening gender | A | B | C | Thread length | Thread size |
| 1-238-001 | Phenolic | Imperial | Female | 1-3/16 | 1-7/8 | 9/16 | 7/16 | 1/4-20 |
| 1-238-005 | Phenolic | Imperial | Female | 1-3/16 | 1-7/8 | 9/16 | 7/8 | 1/4-20 |
| 1-238-017 | Phenolic | Imperial | Female | 1-3/16 | 1-7/8 | 9/16 | 3/4 | 5/16-18 |
| 1-238-019 | Phenolic | Imperial | Female | 1-3/16 | 1-7/8 | 9/16 | 5/8 | 3/8-24 |
| 1-238-021 | Phenolic | Imperial | Female | 1-3/16 | 1-7/8 | 9/16 | 7/8 | 3/8-16 |
| 1-238-029 | Phenolic | Imperial | Female | 1-3/16 | 1-7/8 | 9/16 | 5/16 | 10-24 |
| 1-238-031 | Phenolic | Imperial | Female | 1-3/16 | 1-7/8 | 9/16 | 1-3/8 | 3/8 |
| 1-238-039 | Phenolic | Imperial | Female | 1-3/16 | 1-7/8 | 9/16 | 5/16 | 10-32 |