THE SPOOL LIST

Thread Pitch Chart

Pick a thread to see its pitch, pitch and minor diameters and stress area. ISO metric (ISO 261 / 724 / 898-1) and Unified (ASME B1.1).

Thread

Pitch

—

Pitch diameter

—

Minor Ø (nut)

—

Stress area

—

Tap drill

—

Full dimensions, tables and FAQ →

Basic (zero-tolerance) dimensions. Metric: d2 = d − 0.649519 P, D1 = d − 1.082532 P, d3 = d − 1.226869 P. Unified: E = D − 0.649519/n, D1 = D − 1.082532/n.

Need it made?

Need the part machined? Post it free — local makers quote.

Post the job free → Browse makers in this field: CNC Machining →

Got the machine? Sell your time on The Spool List. Join as a maker

Thread dimensions by size

Thread Pitch Chart

Need it made?

Thread dimensions by size

Metric coarse (ISO 261)

Metric fine (ISO 261)

UNC (ASME B1.1)

UNF (ASME B1.1)