248 Series - Dimcogray recessed top knurled knob
| Part N° | Material | Unit system | Fastening gender | A | B | C | D | Thread length | Thread size |
| 1-248-022 | Phenolic | Imperial | Female | 1-7/8 | 13/16 | 1 | 1/2 | 1/2 | 5/16 |
| 1-248-033 | Phenolic | Imperial | Female | 1-7/8 | 13/16 | 1 | 1/2 | 11/16 | 7/16 |
| 1-248-036 | Phenolic | Imperial | Female | 1-7/8 | 13/16 | 1 | 1/2 | 15/32 | 1/4 |
| 1-248-043 | Phenolic | Imperial | Female | 1-7/8 | 13/16 | 1 | 1/2 | 7/16 | 1/4-28 |
| 1-248-059 | Phenolic | Imperial | Male | 1-7/8 | 13/16 | 1 | 1/2 | 1-1/4 | 5/16-18 |
| 1-248-070 | Phenolic | Imperial | Female | 1-7/8 | 13/16 | 1 | 1/2 | 1/2 | 1/4 |