| TC7-450 Crown Block Parts List (BOMCO) | |
| No. | Description | Drawing No. |
| 1 | Crown block crane boon | AA450104-0100 |
| 2 | Protecting cover | AA450104-0200 |
| 3 | Retainer frame I | AA450104-0300 |
| 4 | Retainer frame II | AA450104-0400 |
| 5 | Crown block frame | AA450104-0500 |
| 6 | Nameplate | AA450104-06 |
| 7 | Supporting frame I | AA450104-0700 |
| 8 | Supporting frame II | AA450104-0800 |
| 9 | Rail fence | AA450104-0900 |
| 10 | Fastline sheave assembly | AA450102-0100 |
| 11 | Anti-collision mechanism | AA450104-1000 |
| 12 | Retainer frame I | AA315102-0500 |
| 13 | Main sheave assembly | AA450102-0200 |
| 14 | Auxiliary sheave assembly | T203-001.00 |
| 15 | Safety chain | T203-011.00 |
| 16 | Sand sheave assembly | T206-001.00 |
| 17 | Retainer frame | T206-002.00 |
| 18 | Nut M24-8 | 420402016240400000 |
| 19 | Nut M24-5 | 420402026240200000 |
| 20 | Cotter pin 5X36 | 420703020805003000 |
| 21 | Blot M24X120-8.8 | 420201031124120000 |
| 22 | | 420201031118035000 |
| 23 | Anti-loosing washing 18 | 420503011181600000 |
| 24 | Screw ST3.5X13 | 60402020351300000 |
| 25 | Blot M24X140-8.8 | 420201031124140000 |
| 26 | Blot M12X25-8.8 | 420201031112025000 |
| 27 | Anti-loosing washing 12 | 420503011121600000 |
| 28 | Short-piteh of climb stairs help | T205-005.00 |
| 29 | Base of lightning guard | T205-004.00 |
