COMMON PITFALLS WHEN SPECIFYING BEARINGS FOR MEDICAL DEVICES
Engineering precision is an art of nuance, especially when selecting the right bearing for a medical device. What begins as a straightforward specification quickly becomes a puzzle of competing requirements, involving material properties, system integration, and supply chain dynamics. A seemingly minor oversight can compromise reliability, increase production costs, or introduce unexpected failure modes, and in medical devices those decisions can directly impact clinical outcomes.
NAVIGATING BEARING SELECTION WITH YOUR SUPPLIER
Most engineers start with internal and external diameters, load capacities, and force calculations. These tell only part of the story. An experienced supplier helps you understand the bearing’s real needs and avoid costly over-specification, including material selection. Boca Bearings offers corrosion-resistant bearings in stainless steel, silicon nitride, alumina oxide, zirconia oxide, PEEK, and titanium, suited to sterilization and patient-facing environments.
The best suppliers treat each device as a unique engineering challenge. For a molecular diagnostic (PCR) testing system, Boca engineers modified standard bearings with specialized corner breaks and lubrication. For a breast biopsy tool, the customer had been using MC3 clearance bearings but needed MC5; Boca sourced stainless steel bearings with MC5 clearance, ABEC 5/ISO P5 ratings, and AF2 lubricant.
PITFALL #1: OVER-ENGINEERING
Over-engineering happens when specifications exceed what the device actually needs, adding cost without improving performance.
Precision levels: Very high ABEC ratings aren’t always required. An imaging device or lab centrifuge rarely needs aerospace-level precision.
Load capacities: Specifying far beyond requirements adds cost with no tangible benefit to performance or lifespan.
Material selection: Specialized polymers and advanced materials can be overkill, raising material costs and complicating manufacturing.
Over-engineering also affects the supply chain. High precision, high load bearings may not be available in volume, causing delays and longer lead times, especially for low-volume devices.
PITFALL #2: TREATING BEARINGS AS STANDALONE COMPONENTS
Tolerance stack-up: Cumulative tolerances can cause misalignment and poor fit. In imaging devices, even minor misalignment can compromise image quality.
Assembly issues: Bearings designed without the full manufacturing process in mind increase assembly time and defect rates.
Performance degradation: Poor integration increases friction, noise, and wear, shortening device life. A medical imaging machine down for a few hours can impact revenue by $100,000.
THE IMPORTANCE OF QUALITY CONTROL
Rigorous component testing, verification of medical-grade standards, and detailed specification reviews are essential, and suppliers should be ISO 9001 certified. Boca Bearings operates a quality management system aligned with ISO 9001 across inquiry, quote, order, pick, pack, ship, delivery, and follow-up.
SUPPORTING THE FULL DEVELOPMENT CYCLE
Medical devices move from prototype (small quantities) to test production (medium) to full-scale production. Boca Bearings supports that entire journey with design engineering, small-quantity prototyping, and the logistics and quality systems needed for full production, with specialized solutions already developed for molecular diagnostics, surgical robotics, biopsy tools, and more.
At Boca Bearings, we don’t just solve problems; we engineer solutions that perform.
For additional assistance, contact one of our bearing experts at Info@bocabearings.com or call (561) 998-0004.