491 Series - Dimcogray 5-star thru hole knob
| Part N° | Material | Unit system | Fastening gender | A | B | C | D | Thread length | Thread size |
| 4-491-001 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 5/8 | 1/4-20 |
| 4-491-002 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 1/4 | 5/16-18 |
| 4-491-004 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 1/4 | 3/8-16 |
| 4-491-005 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 5/8 | 5/16-18 |
| 4-491-006 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 5/8 | 3/8-16 |
| 4-491-008 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 1/4 | 1/4-20 |
| 4-491-009 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 1/4 | 3/8-24 |
| 4-491-012 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 1/4 | 3/8-16 |
| 4-491-014 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 5/8 | 3/8-24 |
| 4-491-015 | Thermoplastic | Metric | Female | 2-1/4 | 1 | 7/8 | 1/2 | 1/4 | M8-1.25 |
| 4-491-016 | Thermoplastic | Imperial | Female | 2-1/4 | 1 | 7/8 | 1/2 | 1/4 | 3/8-24 |