Stafford Manufacturing Corp., Wilmington, Mass., has expanded its line of standard, off-the-shelf, metric shaft collars. Stafford Metric Shaft Collars now include standard 3- to-80-millimeter I.D. sizes, complete with metric clamping screws. The collars are made from aluminum, steel and stainless steel in one-piece, two-piece clamp-type and hinged styles. Featuring smooth and threaded bore configurations, these metric collars are compatible with metric machinery, conveyors and equipment sold worldwide, the company says. In addition to standard metal parts, Stafford Metric Shaft Collars can be machined from Teflon, nylon, and other thermoplastics in one- and two-piece styles and sizes from 6.35 to 102 millimeters. Stafford offers collar sizes up to 400 millimeter I.D. and optional treatments, such as wrench flats, holes and knurls. Stafford Metric Shaft Collars are priced according to material, style, size and quantity.