Sandvik / Tamrock
551 746 55a PISTON
DD321-40
| Part Number | 551 746 55a |
| Description | PISTON |
| Brand | Sandvik (Tamrock) |
| Assembly | Pump Unit |
| Type | Drill Rig Spare Part |
Quick answer
551 746 55a (also written 55174655a, 551-746-55a, or 551.746.55a) is a Sandvik piston spare part used in the Pump Unit assembly of the Sandvik DD321-40. Verified compatible with 25 Sandvik machine models including DD320S, DD321-40, DD321-40C. 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: 55174655a, 551 746 55a, 551-746-55a.
Compatible machines
25
OEM cross-reference
551 746 55a
About Sandvik 551 746 55a PISTON
A critical hydraulic component in the Sandvik DD321-40 percussion mechanism, this piston converts hydraulic pressure into the powerful impact force needed for rock breaking. Located in the Pump Unit, worn pistons cause reduced penetration rate, increased energy consumption, and decreased overall drilling efficiency.
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
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.
