Tr10 × 1.5 Thread Dimensions

Basic information

Designation

Tr 10 × 1.5

Thread system

Trapezoidal

Series

trapezoidal

Standard

ISO 2901

Basic profile

Trapezoidal basic profile

Flank angle

30°

Dimensions

Major diameter

10 mm

Pitch

1.5 mm

Threads per inch

16.93

Pitch diameter

9.25 mm

Minor diameter (external)

8.95 mm

Minor diameter (internal)

8.5 mm

Thread depth

0.9 mm

Recommended tap drill

Ø 8.5 mm

These figures follow the Trapezoidal basic profile of ISO 2901. A 60° basic profile uses a fundamental triangle height H = 0.866025 × P, with external minor diameter d₃ = d − 1.226869 × P and internal minor diameter D₁ = d − 1.082532 × P; the two differ because the external root is rounded while the internal crest is truncated. A 55° Whitworth profile uses H = 0.960491 × P and a thread height of 0.640327 × P. The recommended tap drill is given as nominal diameter minus pitch, which approximates 75% thread engagement — adjust it for tough materials or deep holes.

No specification in this database uses Tr10 × 1.5. Power threads are not fastener threads — they are found on lead screws, jacks and vice screws, so no bolt or nut in this catalogue is made in this form. The geometry above is what a machinist needs to cut it.

Other pitches at the same 10 mm diameter — a fine pitch on a coarse diameter, or the reverse, is the usual substitution question.

Neighbouring sizes in Trapezoidal.