Mitutoyo 188-102 Whitworth 28-leaf pitch gauge
Check compatibility
Mitutoyo 188-102 is the 55-degree Whitworth gauge, with 28 leaves and documented pitches from 4 to 60 TPI. Choose 188-111 if you need the 60-degree Unified profile instead. Match the actual leaf as well as the form.
Questions before ordering
Does a 20-TPI match establish a Unified thread?
Compare the form as well as the count. Mitutoyo identifies this model as 55-degree Whitworth. The 188-111 is the maker's 60-degree Unified option.