Calculate cutting parameters for drills, taps, endmills, and ballnose tools. Determine tap drill sizes for inch and metric cut and form taps. Compute suggested tap drill sizes for NPT and NPS threads. Convert decimal equivalents to fractional values.
by OSG USA, INC.★ 4.02 ratingsReferenceFreeData updated 2026-09-08
Calculate size for operations by selecting type, tap size, percentage depth of , clearance, and cutting or forming operation. Adjust settings via tap interface without typing.
Calculate bit size for threaded holes using bolt diameter, thread pitch, and percentage for inch and metric threads. Display close fit hole sizes for common sizes. Provide tables for standard inch fractional and numeric bit sizes.
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Perform machine shop calculations for diameters, angles, and threads. Convert between imperial and metric units. Access formulas for gear ratios and thread pitch. Store and retrieve frequently used values. Export results in printable format.
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Access screw and bolt specifications with detailed dimensions and material grades. View US screws including 93 sizes and 74 material options. Purchase metric screws for 210 sizes and 86 material grades.