M19 to inch bolt conversion
M19 metric major diameter 19 mm often pairs in shops with closest inch stock near 3/4-10 (approx.) for rough hardware swaps.
Threads are not drop-in identical: pitch in millimeters differs from UNC TPI even when diameters look close on calipers.
Run screw size conversion on BoltLab, then read metric vs unc thread notes before you retap mixed-material joints.
Use this page when you are translating BOM lines or field repairs between metric bins and imperial assortments.
M19 inch reference
| Field | Value |
|---|---|
| Metric nominal | M19 |
| Coarse pitch | 2.5 mm |
| Common inch counterpart (rough) | 3/4-10 (approx.) |
Verification
Measure major diameter and pitch, then compare against the thread pitch chart tool output when a drawing lists TPI instead of millimeters.
M19 links and tools
Open the bolt size chart (M19) for hex, pitch, and tap drill in one hub table.
Use tap drill size when pitch differs from coarse or you need a quick recalculation.
Run the thread identifier after you measure major diameter and pitch on a sample thread.
Compare stocked inch hardware with screw size conversion when you cross-shop bins.
Convert pitch units with the thread pitch chart tool when drawings mix mm and TPI.
Review metric vs unc thread naming before you mix UNC taps with metric holes.
Neighbor metric hub: bolt size chart (M18) for the next smaller shank.
Neighbor metric hub: bolt size chart (M20) for the next larger shank.