Sandvik / Tamrock
550 591 78b Pump, PISTON
DT821-C
| Part Number | 550 591 78b |
| Description | Pump, PISTON |
| Brand | Sandvik (Tamrock) |
| Assembly | Pump, double |
| Type | Drill Rig Spare Part |
Quick answer
550 591 78b (also written 55059178b, 550-591-78b, or 550.591.78b) is a Sandvik pump, piston spare part used in the Pump, double assembly of the Sandvik DT821-C. Verified compatible with 11 Sandvik machine models including DD421-60, DD421-60C, DD422i. 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: 55059178b, 550 591 78b, 550-591-78b.
Compatible machines
11
OEM cross-reference
550 591 78b
About Sandvik 550 591 78b Pump, PISTON
This piston is a key element of the Pump, double in the Sandvik DT821-C. It operates under extreme cyclic loading and high-pressure hydraulic conditions. Maintaining OEM-specification pistons ensures optimal percussion energy transfer and maximizes rock-breaking performance.
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
How does a worn piston affect drilling performance?
A worn piston reduces percussion energy transfer, decreasing penetration rate and increasing the time and energy required to drill each hole. This directly impacts productivity and operating costs in mining operations.
