ThreadSpec — Thread Reference

D.Ilyin

In-app purchases

About this app

ThreadSpec is a fast, offline reference for screw threads — for
engineers, machinists, toolmakers, and DIY. Identify and match
metric and imperial threads: ISO, DIN, UNC/UNF, BSP/G.

• Thread identifier by measurements (diameter, pitch, profile
angle) — ranked matches.
• Catalog of metric and imperial threads with filters by system
and standard.
• Key dimensions: diameters, pitch, tap drill, tolerances.
• Clear axial-section drawing of each thread.
• Engineering tools (Pro): tightening torque, bolt preload and
minimum thread engagement for the chosen property class and nut
material.
• Favorites, millimeters/inches, light/dark themes,
English/Russian.

Works offline. No ads, no tracking, no accounts.

What’s new

• New standard filter in the catalog: the "Standard" button opens a panel with every standard at once — no more scrolling a row of chips.
• Standards are grouped by country: ISO, DIN, BS, NF, JIS, ASME, GOST. Jump straight to a country with the index button in the panel.
• Each standard shows its thread type and how many sizes the catalog holds.
• The selected standard stays on the button and clears with one tap.