8 Ways We Prove Your Device Is Built to Spec

A part that’s a fraction of a millimetre off spec can still assemble, still look correct, and still fail the moment it’s actually used.

Dimensional and Surface Metrology Testing is the checkpoint that catches what a visual inspection and a functional test both miss: a tolerance stack-up that’s technically within spec but leaves no margin, a surface finish that looks fine to the eye but drives friction or bacterial adhesion, or a lumen that’s a few microns narrower than drawn. Our testing service at the Oragadam laboratory covers eight checkpoints across tolerance, surface, thickness, and geometric measurement, referenced to ASME Y14.5 for geometric dimensioning and tolerancing, ISO 1101 for geometrical tolerancing, and ISO 4287 for surface texture parameters.

Tolerance verification testing confirms every critical dimension on a component sits within the range specified on its engineering drawing, using coordinate measuring machines and optical comparators rather than manual gauges wherever the geometry demands better repeatability. Surface roughness testing for medical device components measures the Ra, Rz, and related surface texture parameters that determine how a part behaves in contact with tissue, fluid, or another component — a rougher-than-specified surface on an implant can encourage bacterial colonisation, while an unexpectedly smooth bearing surface can fail to hold lubricant the way the design assumed. Coating thickness testing confirms an applied coating — anti-corrosive, lubricious, or drug-eluting — sits within its specified thickness band, because a coating that’s too thin loses its function and one that’s too thick can change fit, flex, or drug release rate.

Mass and magnified inspection combines a straightforward weight check against the specified mass tolerance with a magnified visual examination for burrs, cracks, inclusions, or flash that a naked-eye inspection would miss entirely. This checkpoint is where most early-stage manufacturing defects are actually caught, long before they’d ever surface in a functional or durability study, which is why it runs as standard practice across every dimensional programme rather than as a one-off spot check. Length, diameter, and wall thickness testing round out the core geometric measurements for tubular and elongated components — catheters, cannulas, needles, and similar devices — where a small variance in any one of these three dimensions can change flow characteristics, insertion force, or structural strength.

Lumen dimensions analysis for medical device tubing confirms the internal bore diameter and its consistency along the full length of the part, which is critical for anything carrying fluid or accepting a secondary instrument — a lumen that narrows even slightly at one point can restrict flow or block passage of a guidewire in a way no external measurement would ever reveal. Manufacturers bring their programs to Kiyo R&D Lab because a single missed checkpoint in Medical Device Testing doesn’t surface as a rejected drawing — it surfaces as an assembly that won’t fit, a device that leaks, or an implant that irritates tissue it was never meant to touch. Running tolerance, surface roughness, coating thickness, mass and magnified inspection, length, diameter, wall thickness, and lumen checks under one accredited scope at Oragadam, with reports formatted for direct regulatory submission, is what turns a Dimensional and Surface Metrology Testing study from a QC formality into evidence your quality team can actually stand behind.

Kiyo R&D Lab – Oragadam

Our testing suite is based at No.13, Srinivasa Perumal Street, Panapakkam, Serapanacheri, Greater Chennai, Tamil Nadu 601301.

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