Sandvik / Tamrock
550 279 79a O-Ring
Rock Drill Spare Part
| Part Number | 550 279 79a |
| Description | O-Ring |
| Brand | Sandvik (Tamrock) |
| Assembly | Rock Drill |
| Type | Rock Drill Spare Part |
Quick answer
550 279 79a (also written 55027979a, 550-279-79a, or 550.279.79a) is a Sandvik o-ring spare part used in the Rock Drill assembly of the Sandvik DC122R. Verified compatible with 6 Sandvik machine models including COMMANDO DC125R, DB120, DC122R. Used in 2 drifter configurations (HEX1, HLX1). 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: 55027979a, 550 279 79a, 550-279-79a.
Compatible machines
6
Drifter configurations
2
OEM cross-reference
550 279 79a
About Sandvik 550 279 79a O-Ring
A precision-molded sealing element for the Sandvik DC122R, this O-ring is used in the Rock Drill to create a reliable static or dynamic seal. Even minor O-ring deterioration can lead to system pressure loss, so scheduled replacement during routine maintenance is strongly recommended.
This is an OEM-compatible aftermarket replacement part for the Sandvik DC122R (DC122R). 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.
