Exact inch to millimeter reference
Convert 5/16 inch to millimeters for CNC setup sheets, drawings, inspection notes, and supplier communication. The formula uses the exact international inch standard.
Answer first
5/16 inch =
7.9375 mm
The exact conversion uses 1 inch = 25.4 mm. This page displays 7.9375 mm by default. For CNC, inspection, RFQ, or supplier documents, keep the precision required by the drawing, tolerance block, process plan, or inspection equipment.
A 5/16 inch value is frequently used around hardware and shop stock. Use the millimeter result as a reference, then check standards and fit requirements.
Reference-only caveat: this conversion does not certify tolerance, fit, pressure, load, code compliance, material equivalence, or interchangeability. Confirm the controlling drawing, standard, supplier data, and engineering approval before manufacturing.
5/16 inch equals 7.9375 mm using the exact conversion factor 1 inch = 25.4 mm.
Use mm = inch × 25.4. For this page, 0.3125 × 25.4 = 7.9375 mm.
Use the precision required by the drawing, process plan, or inspection method. This page shows 7.94 mm, 7.938 mm, and 7.9375 mm so you can choose the appropriate display precision.
Yes. 5/16 inch is represented here as 0.3125 inch before multiplying by 25.4 to get millimeters.
No. This is a reference unit conversion only. Confirm drawing tolerances, standards, material specifications, supplier certificates, and engineering approval before manufacturing or substituting parts.
