ARM

The 550 635 91A ARM (55063591a, 550-635-91a, ARM 55063591a) is a mining-grade structural ARM engineered for Sandvik drilling rigs, ROC series machinery, and underground jumbos. The 550 635 91A ARM supports mechanical linkages, hydraulic drives, and feed assemblies exposed to extreme vibration, drilling shock, and heavy-load operating conditions.

This 550 635 91A ARM is manufactured from reinforced, high-strength steel with precision-machined interfaces to ensure stable mounting, accurate alignment, and long-term durability. Catalog identifiers 55063591a and 550-635-91a are widely referenced in OEM and aftermarket spare parts listings.

The 550 635 91A ARM provides critical structural support and alignment within drilling assemblies, linking moving components such as boom joints, feed mechanisms, stabilizers, and actuators. Proper ARM rigidity improves drilling accuracy, minimizes mechanical wear, and maintains correct geometry under harsh mining and tunneling loads.

Inspect the 550 635 91A ARM for cracking, deformation, weld fatigue, surface wear, or worn pivot interfaces. Replace immediately if any structural weakness is detected.

Also indicated as 55063591a, 550-635-91a, and ARM 55063591a, this structural ARM is essential for maintaining stable mechanical geometry in heavy-duty drilling operations.