Epiroc Has Launched the ET55 Drill String
The new drill string system features shoulder drive connections to boost energy transfer and operational efficiency.
Updated on Oct. 1, 2026 in Oil and Gas
Epiroc has officially introduced the ET55 drill string as the latest addition to its drilling portfolio. This system replaces the company's previous ST58 model.
Why it matters
The ET55 was developed to improve site durability by reducing vibrations and minimizing unplanned downtime caused by drill string failures.
The ET55 drill string joins the existing ET66, ET51, ET45, and ET38 series, which were released throughout 2024. It serves as the direct replacement for the legacy ST58 system.
The players
Epiroc
Epiroc is a global productivity partner for the mining and infrastructure industries that provides drill rigs, rock excavation, and construction equipment.
The details
The ET55 utilizes shoulder drive connections across the entire system to support increased energy transfer into rock formations. The updated thread geometry is designed to facilitate easier uncoupling and reduce the frequency of stuck tubes during operation.
Timeline
In 2024, Epiroc introduced the ET66, ET45, and ET38 drill string models.
On October 1, 2026, Epiroc launched the ET55 drill string.
Market Landscape
This release follows the rapid expansion of the ET series, which aims to standardize drill string architecture across multiple sizing categories. By replacing the ST58, Epiroc is streamlining its hardware ecosystem to compete more effectively through improved component durability.
Mining operators can expect improved equipment reliability and fewer mechanical interruptions during drilling tasks. The updated thread design specifically targets common site headaches like stuck tubes and frequent component breakage.
The takeaway
The transition to the ET55 reflects an industry-wide push toward reducing mechanical failure through advanced thread geometry. Implementing these standardized systems can help drilling teams maintain more consistent uptime in demanding environments.
Further reading
For more on industry hardware developments, visit the Oil and Gas section.
Source note: This article includes information reported by International Mining.
