Sandvik / Tamrock
551 991 40 Rock drill PISTON
Rock Drill Spare Part
| Part Number | 551 991 40 |
| Description | Rock drill PISTON |
| Brand | Sandvik (Tamrock) |
| Assembly | Rock drill |
| Type | Rock Drill Spare Part |
Quick answer
551 991 40 (also written 55199140, 551-991-40, or 551.991.40) is a Sandvik rock drill piston spare part used in the Rock drill assembly of the Sandvik DD320-40. Verified compatible with 6 Sandvik machine models including DD320-40, DD320S, DD321-40. Used in 1 drifter configuration (HLX5). 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: 55199140, 551 991 40, 551-991-40.
Compatible machines
6
Drifter configurations
1
OEM cross-reference
551 991 40
Reference image
Available
About Sandvik 551 991 40 Rock drill PISTON
This piston is a key element of the Rock drill in the Sandvik DD320-40. 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 DD320-40 (DD320-40). 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.
