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53 series ceramic spool type insulator specifications as folowings:
| Type | 53-1 | 53-2 | 53-3 | 53-4 | 53-5 | ||
| Main dimensions(mm) | H | 54 | 76 | 81 | 76 | 105 | |
| h | 27 | 38 | 40.5 | 38 | 52.5 | ||
| D | 57 | 79 | 76 | 105 | 102 | ||
| d | 45 | 45 | 45 | 73 | 73 | ||
| d1 | 18 | 18 | 18 | 18 | 18 | ||
| d2 | 22 | 24 | 24 | 24 | 24 | ||
| R | 11 | 18 | 11 | 16 | 11 | ||
| Mechanical failing load (kg) | 907 | 1360 | 1814 | 2041 | 2722 | ||
| power frequency (KV) | dry | 20 | 25 | 25 | 25 | 35 | |
| wet | upright | 8 | 12 | 12 | 12 | 18 | |
| level | 10 | 15 | 15 | 15 | 25 | ||
| Weight (kg) | 0.22 | 0.55 | 0.6 | 1.15 | 1.2 | ||
Spool Insulator