Depth micrometer

Depth gauges (also known as depth micrometers) are tools for measuring things such as depth of grooves and height of protrusions. Numerical measurements are made by vernier. Main scale length is generally 150, 200, or 300 mm. Those with a dial gauge, micrometer-type depth micrometers, etc. are also available. The main type is stainless steel. With digimatic types, a broad range of measurements are possible with 1 main body by replacing the rod. A variety of types are available with different measurement range, minimum display, base dimensions, mechanical or dial type, etc., so it should be selected according to the application. When measuring depth dimensions, measurements are made by inserting the tip of the depth gauge into the groove, etc. to be measured, so there is little variance in measurement values and accurate measurement is possible. MITUTOYO ABSOLUTE Digimatic Depth Gage Series 547 [FEATURES] ABSOLUTE Digimatic Depth Gage can keep track of the origin point once set for the entire life of the battery. Wide probing range is available with the supplied extension rod. Bottom surface of the base is hardened, ground and lapped for highest degree of flatness. With SPC data output. [Technical Data] Resolution*: 0.001mm, 0.01mm, .00005"/0.001mm or .0005”/0.01mm Flatness of base face: 5µm Measuring force: 1.4N, 1.5N Display: LCD Battery: SR44 (1 pc.), 938882 Battery life: Approx. 3.5 years under normal use [Function] Origin-set, Zero-setting,Data output, inch/mm conversi...

• The depths of holes, slots, shoulders and projections can be measured with these fine tools • 6" (150mm) base and 5/32" (4mm) diameter measuring rods • Combination ratchet and speeder for uniform pressure and quicker adjustment • Ring-type knurled lock nut for quick and sure locking • Satin chrome reading surface is glare free and resists rust • Made in America: Yes • Micrometer Type: Mechanical • Range (mm): 0-150mm • Graduations (mm): 0.01mm • Base Length (mm): 150mm • Lock Nut Type: Ring Type Knurled • Measuring Rods (qty): 6 • Rod Diameter (mm): 4mm • Thimble Type: Ratchet • Case Type: Padded Case • Accuracy (mm): Mic head +/-.0025mm; Rods +/-.005mm Member of Kit Item # Description Part No. Qty Information 1 BASE SUB ASSEMBLY 6" NOT AVAILABLE 1 2 LOCK NUT #445 KIT 1 3 •PIN, .123X.155X151 1 4 •SPRING, .132X.156X.094X.012X2 -1/2 1 5 •RING, BINDER 1 6 SHELL, ADJUSTING 1 7 NUT, .375-52 1 8 SPINDLE SCR. .291-40 1 9 SPRING, BARREL 1 10 SHELL, OUTSIDE 1 11 CAP, SHELL 1 12 RATCHET ASSEMBLY 1 13 •NUT,#2-64 RATCHET 1 14 •CAP ASSEMBLY 1 15 •PIN, RATCHET .066D X .156L 1 16 •SPRING, .041X.061X.188X.010X6 1 17 •SCREW, #2-64 SLOT X .204 LONG 1 18 0-25MM ROD ASEMBLY 1 19 25-50MM ROD ASSEMBLY 1 20 50-75MM ROD ASSEMBLY 1 21 75-100MM ROD ASSEMBLY 1 22 100-125MM ROD ASSEMBLY 1 23 125-150MM ROD ASSEMBLY 1 24 WRENCH #3 1 25 CASE ONLY, STEEL/VINYL 1 NOT SHOWN 26 REPLACEMENT ROD NUT, .125-40 1 NOT SHOWN

• The depths of holes, slots, shoulders and projections can be measured with these fine tools • 4" (100mm) base and 5/32" (4mm) diameter measuring rods • Combination ratchet and speeder for uniform pressure and quicker adjustment • Ring-type knurled lock nut for quick and sure locking • Satin chrome reading surface is glare free and resists rust • Made in America: Yes • Micrometer Type: Mechanical • Range (in): 0-6" • Graduations (in): .001" • Base Length (in): 4" • Lock Nut Type: Ring Type Knurled • Measuring Rods (qty): 6 • Rod Diameter (in): 5/32" • Thimble Type: Ratchet • Case Type: Padded Case • Accuracy (in): Mic head +/-.0001"; Rods +/-.0002" Member of Kit Item # Description Part No. Qty Information 1 BASE SUB ASSEMBLY 4" NOT AVAILABLE 1 2 LOCK KIT 1 3 •PIN, .123X.155X151 1 4 •SPRING, .132X.156X.094X.012X2 -1/2 1 5 •RING, BINDER 1 6 SHELL, ADJUSTING 1 7 NUT, .375-52 1 8 SPRING, BARREL 1 9 SPINDLE SCR. .291-40 1 10 SHELL, OUTSIDE 1 11 CAP, SHELL 1 12 RATCHET ASSEMBLY 1 13 •NUT,#2-64 RATCHET 1 14 •CAP ASSEMBLY 1 15 •PIN, RATCHET .066D X .156L 1 16 •SPRING, .041X.061X.188X.010X6 1 17 •SCREW, #2-64 SLOT X .204 LONG 1 18 ROD ASSEMBLY 0-1" 1 4-3/16" LNG 19 ROD ASSEMBLY 1-2" 1 5-3/16" LNG 20 ROD ASSEMBLY 2-3" 1 6-3/16" LNG 21 ROD ASSEMBLY 3-4" 1 7-3/16" LNG 22 ROD ASSEMBLY 4-5" 1 8-3/16" LNG 23 ROD ASSEMBLY 5-6" 1 9-3/16" LNG 24 WRENCH #3 1 25 CASE ONLY, STEEL/VINYL 1 NOT SHOWN 26 REPLACEMENT ROD NUT, .125-40 1 NOT SHOWN

Image credit: chicagobrand.com The two main parts that differentiate depth mics from outside mics are the flat base attached to the sleeve and the measurement rod. The flat base stabilizes the mic on the top surface of the recessed part. The measurement rod typically has a small diameter to facilitate the measurement of small holes or slots. Measurement rods come in different sizes and are interchangeable to allow the measurement of multiple depths. Just like any other mic, depth micrometers feature a scale on the sleeve that shows the depth measurement. Unlike traditional mics, zero is located toward the end of the thimble. The measurement is read in reverse and increases as the thimble moves toward the base of the instrument. Mechanical vs. digital depth micrometers Depth micrometers come both in digital and mechanical styles. Mechanical depth micrometers apply the working principle of the screw and nut to display the reading on the sleeve. If properly maintained and calibrated, they can last forever but, as for any other type of micrometers, they require a bit of thinking when it comes to reading the measurement. Digital depth micrometers, on the other hand, apply electronic principles to take measurements. They are extremely easy to read and can measure in both inches and millimeters but are also more delicate than their analog counterparts. How to use a depth micrometer First, you’ll want to select the right rod size (which depends on the depth of the recessed area yo...