Sandvik / Tamrock
550 770 79 O-RING
DT820
| Part Number | 550 770 79 |
| Description | O-RING |
| Brand | Sandvik (Tamrock) |
| Assembly | JACK |
| Type | Drill Rig Spare Part |
Quick answer
550 770 79 (also written 55077079, 550-770-79, or 550.770.79) is a Sandvik o-ring spare part used in the JACK assembly of the Sandvik DT821-C. Verified compatible with 9 Sandvik machine models including AXERA 8-290, DS510-C, DS511-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: 55077079, 550 770 79, 550-770-79.
Compatible machines
9
OEM cross-reference
550 770 79
About Sandvik 550 770 79 O-RING
This O-ring provides critical sealing in the hydraulic or pneumatic circuits of the Sandvik DT821-C. Part of the JACK, it prevents fluid leakage at connection points and maintains system pressure integrity essential for efficient 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 do O-rings fail in drilling equipment?
O-rings fail due to chemical degradation from hydraulic fluid, extreme temperature cycling, excessive pressure spikes, improper installation (twisting or pinching), and age-related hardening. Using the correct material compound for each application is critical.
