Starrett 84Z-134-6J Dial Bore Gauge, 0.0005" Indicator Graduation, 5"- 8-1/8" Total Range With Extension, 6" Maximum Bore Depth
by Starrett
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Review & Description
The Starrett 84Z-111-6J bore gage has a range, including extension, of 5 to 8-1/8”, with maximum bore depth of 6”, 0.035” of plunger travel, and indicator graduations of 0.0005”. The three extensions have a range of 5.000 to 6.187”, 6.187 to 7.125”, and 7.125 to 8.125”. The dial indicator has jewel bearings for improved accuracy over other indicators. An adjustable range screw and two centralizing plungers provide accurate, three-point contact for tool alignment in larger bores. The hardened tool steel contacts and plungers provide wear resistance. Housing and knurled handle are aluminum for light weight, and constructed for good balance. The plungers are spring-loaded for sensitivity during measurement.
Bore gages measure holes, or bores, in a workpiece. They can measure the interior diameter of a hole at any depth, while internal micrometers can only measure to the depth of their teeth. Bore gages are typically calibrated with a setting ring. Bore gages come in two types, one simple, and the other direct-measuring. Simple bore gages are used with a caliper to transfer the hole measurement, while the more complex gages take the measurement directly, and display the measurement through a vernier, dial, or digital display. Bore gages have a two- or three-point contact, which indicates how many points on the gage head touch the inside of the bore. Two-point contacts are better at measuring ovality, while three-point systems are used to measure lobing, or triangular form error. Pistol-grip bore gages are used for fast, single-handed operation with good repeatability from one operator to another. Bore gages, regardless of type, can be used in some special applications, such as measuring threads, spline pitch diameters, and deep bores.
The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.
What’s in the Box?
- Starrett 84Z-134-6J bore gage
- 5.000 to 6.187” extension
- 6.187 to 7.125” extension
- 7.125 to 8.125” extension
- Finished wood case
Product Details
- Brand: Starrett
- Model: 84Z-134-6J
- Number of items: 1
Features
- Range, including extension, is 5 to 8-1/8", with maximum bore depth of 6", 0.035" of plunger travel, and indicator graduations of 0.0005"
- Adjustable range screw and two centralizing plungers provide accurate, three-point contact for tool alignment in larger bores
- Hardened tool steel contacts and plungers for wear resistance
- Housing and knurled handle are aluminum for light weight, and constructed for good balance
- Dial indicator has jewel bearings for improved accuracy over other indicators
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