Sandvik / Tamrock
551 709 54a O-ring
DD321-40
| Part Number | 551 709 54a |
| Description | O-ring |
| Brand | Sandvik (Tamrock) |
| Assembly | Mud separator assembly |
| Type | Drill Rig Spare Part |
Quick answer
551 709 54a (also written 55170954a, 551-709-54a, or 551.709.54a) is a Sandvik o-ring spare part used in the Mud separator assembly assembly of the Sandvik DD321-40. Verified compatible with 6 Sandvik machine models including DD321-40, DD321-40C, DD421-60C. 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: 55170954a, 551 709 54a, 551-709-54a.
Compatible machines
6
OEM cross-reference
551 709 54a
About Sandvik 551 709 54a O-ring
A precision-molded sealing element for the Sandvik DD321-40, this O-ring is used in the Mud separator assembly 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 DD321-40 (DD321-40). 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.
