5/16-18 x 3 1/4 is built for legacy machinery and industrial assemblies that still specify a square head set screw instead of a headless socket screw.
Typical applications include large adjustment stops, travel-limit hardware, and machine fixtures. The product record carries the size; the requested point is selected from the Half Dog, Full Dog, Cone, Oval, and Flat menu. Point selection should reflect the shaft feature, acceptable marking, and expected service adjustment.
Availability-row diameters and unusually long lengths are handled as quote-driven square-head requirements by Cold Headers. Review the selected point, wrench clearance, and mating feature before substitution. The square head equals the nominal diameter across flats, giving the wrench size a direct relationship to the screw size.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
