Optical Comparator

Some fastener characteristics demand precision that only an Optical Comparator can provide. Features such as under-head fillets, thread root radii, flat head and point angles, chamfer diameters, and groove depths require accurate visual inspection—and the comparator excels in every one of these applications.

Greenslade offers two Optical Comparator models, both designed to support rigorous inspection standards in fastener manufacturing:

  • Model OC-121E: 12″ screen with digital scale readout; measures lengths and heights to ±0.0005″ resolution.
  • Model OC-1400: 14″ screen with computerized digital readout; calculates angles, radii, lengths, and heights to ±0.0001″ resolution.

Optical Comparators use two types of illumination:

  • Profile illumination reveals the part’s silhouette by casting a shadow on the viewing screen—ideal for outline-based features.
  • Surface illumination displays visible surfaces for measuring chamfers, shoulder lengths, and engraved details.

Both models support measurements in inches or millimeters, offering maximum flexibility for your quality control team.

Ready to upgrade your visual inspection process?

→ Explore which Optical Comparator model fits your inspection workflow best