Micrometers - Depth
Micrometers - Depth
A standard micrometer can't tell you how deep a hole or step actually goes. Fowler's depth micrometers solve that with a flat base and a sliding rod instead of two opposing anvils, running from economy mechanical models to digit counter and IP54 electronic versions, plus deep throat micrometers for measuring into slots and recesses a standard depth mic can't reach.
Fowler 0 - 12" Premium Depth Micrometer with 4" Base
$489.00
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How to choose
Base size
2.5" base vs. 4" base
A wider base sits flatter and more stable across an uneven or curved surface, which matters more as the part gets larger or the surface less true. A 2.5" base is easier to maneuver in tight spaces. A 4" base is the safer default for general shop use.
Reading method
Economy vs. digit counter vs. electronic
Economy depth micrometers read off a mechanical vernier scale. Digit counter versions add a number wheel for a faster read at a higher price point. IP54 electronic models add an LCD display and coolant resistance, worth it if the micrometer lives near the machine rather than in a toolbox.
Reaching into slots
When to choose a deep throat micrometer
A deep throat micrometer isn't measuring straight down like a standard depth mic. It reaches sideways into a slot or recess with a 6" or 12" throat depth, for features a standard base-and-rod depth mic physically can't get into.
Common questions
A standard depth micrometer measures straight down from a flat base, for holes and steps. A deep throat micrometer reaches sideways into a slot or recess with an extended throat, for features a base-and-rod tool can't access.
A 4" base sits more stably across a larger or less-true surface, reducing the chance of a tilted, inaccurate reading. A 2.5" base is easier to fit into tighter spaces where a wider base won't sit flat.
Not necessarily. Accuracy is set by the tool's grade, not the display type. Digit counter models are faster to read, not inherently more precise than a comparable economy vernier-scale depth micrometer.