


Sandvik / Tamrock
550 918 81a Extension, Boom
DT821-C
| Part Number | 550 918 81a |
| Description | Extension, Boom |
| Brand | Sandvik (Tamrock) |
| Assembly | Boom, Zoom |
| Type | Drill Rig Spare Part |
Quick answer
550 918 81a (also written 55091881a, 550-918-81a, or 550.918.81a) is a Sandvik extension, boom spare part used in the Boom, Zoom assembly of the Sandvik DT821-C. Verified compatible with 4 Sandvik machine models including DT820, DT821, DT821-C. Available as an aftermarket replacement drill part from BK Drilling — Turkey-based Sandvik and Epiroc spare parts supplier serving mining contractors worldwide. Quote on request via WhatsApp; typical lead time 3-7 days for stock items.
Part code alternate forms: 55091881a, 550 918 81a, 550-918-81a.
Compatible machines
4
OEM cross-reference
550 918 81a
About Sandvik 550 918 81a Extension, Boom
This component is part of the Boom, Zoom assembly in the Sandvik DT821-C. Maintaining OEM-compatible replacement parts ensures reliable machine performance and minimizes downtime in demanding mining and drilling operations.
This is an OEM-compatible aftermarket replacement part for the Sandvik DT821-C (DT821-C). Also compatible with Tamrock branded equipment of the same model series. BK Drilling supplies this part with fast worldwide shipping and competitive pricing.
Frequently asked questions
Why use OEM-compatible parts for Sandvik drilling equipment?
OEM-compatible parts are manufactured to the same dimensional tolerances and material specifications as original components, ensuring proper fit, reliable performance, and maintaining the designed safety margins of the drilling machine.





