249 Series - Dimcogray recessed top knurled knob
| Part N° | Material | Unit system | Fastening gender | A | B | C | D | Thread length | Thread size |
| 1-249-023 | Phenolic | Imperial | Female | 1-7/8 | 9/16 | 1 | 1/4 | 5/16 | 8-32 |
| 1-249-032 | Phenolic | Imperial | Male | 1-7/8 | 9/16 | 1 | 1/4 | 5/8 | 1/4-20 |
| 1-249-036 | Phenolic | Imperial | Male | 1-7/8 | 9/16 | 1 | 1/4 | 1/2 | 1/4-20 |
| 1-249-037 | Phenolic | Imperial | Male | 1-7/8 | 9/16 | 1 | 1/4 | 1-1/4 | 5/16-18 |
| 1-249-039 | Phenolic | Imperial | Male | 1-7/8 | 9/16 | 1 | 1/4 | 1 | 3/8-24 |
| 1-249-040 | Phenolic | Imperial | Male | 1-7/8 | 9/16 | 1 | 1/4 | 2 | 3/8-24 |
| 1-249-300 | Phenolic | Metric | Male | 1-7/8 | 9/16 | 1 | 1/4 | 15 | M6-1.0 |