$7.00
6740
No.6740 Crown Measuring Gauge Watch Repair Tool
5.0 from 3 notes
Metal gauge for checking crown diameter, tube opening, stem thread, tap size, and lug width at the bench.
$134.00
Prices are as the listing last showed them.
| Reference | 6740 |
|---|---|
| Drawer | Bench & Storage |
| What it is | A tool in its own right |
| Bench job | Setting up the bench |
Matching a replacement crown requires several distinct dimensions before ordering or fitting stock. We cut this metal gauge to read crown outer diameter, the inner tube opening, stem threading, tap sizes, and lug spacing on a single plate. It lays flat near your parts tray while you sort.
Metal gauge plate
We cut the plate from solid metal so the measuring cutouts and thread checkpoints hold their shape across years on the bench. It sits flat alongside your calipers and tweezers.
Crown diameter slots
Graduated cutouts along the edge let you seat an unknown crown directly against the reference profile to check outer diameter. You find the match without guessing.
Tube opening checks
Stepped posts and cutouts measure the inner recess of the crown where the case tube enters. This lets you match the crown bore to the existing case tube.
Stem thread and tap
Threaded holes and checkpoints identify the tap size and stem thread of the component in hand. You test the winding stem before fitting it to the crown.
Alongside it in Bench & Storage
$39.00
$39.99
$14.99
A note that touches this tool
Keeping the bench clean
Cleaning putty and what it lifts, why solvents are kept away from some surfaces, the point of a bench mat and a tray with a lip, cloths and brushes, and how tools are put away so the next job starts on a clear board.
6740
$134.00