In production operations where a large volume of parts is being produced, plug gauges provide a rapid means of assessing the quality without taking time to perform actual hole diameter measurements and to set-up instrumentation. The diameter is .150 +.004 /-.002. For larger parts, the two may be separate pieces. That is called Go and Not-Go measurement. Chrome-plated plug gauges will also provide a harder surface and can be used for the gaging of abrasive materials such as magnesium or aluminum. an internally threaded part. There are several varieties of tools used to measure the gaps of spark plugs, some of which are more appropriate for more modern plugs, which sometimes feature delicate precious metals. The gage must match the classifi-cation of the L1 plug within +/- 1/2 turns. If the Go gauge fits into the hole or bore, then the hole is within the acceptable tolerance for minimal size. The NOGO gage can at the best enter into the nut, checked at both ends, over not more than 2 turns. ico-arrow-default-right. For the part to be accepted, the no-go plug gauge should not fit into the hole. The tolerance of the part that this gauge checks is 0.30 mm, where the lower size of the hole is 12.60 mm and the upper size is 12.90 mm, every size outside this range is out of tolerance. Here’s another very affordable old standard. Free CAD downloads, quick delivery, competitive pricing, and no minimum order quantity. Company. When you need to check parts quickly, Progressive plug gages are the best choice. This gaging process is designed to allow accurate assessments to be made without the need for production personal to resort to the use of additional, more sophisticated, and more expensive measuring instruments such as inside micrometers. These gauges made with standard or special tapers are used to check the size of the hole and the accuracy of the taper. Copyright© 2021 Thomas Publishing Company. Note that as you proceed from left to right in the table along a given row, the tolerance values increase (moving from class XXX to class ZZ). The terminology and significance can be confusing. Plug gauges come in several styles or configurations making them suitable for different uses. Other articles where Plug gauge is discussed: gauge: …hole, a cylindrical bar (plug gauge) with highly finished ends of different diameters is used. COVID-19 Response 3 +0.001D, IT 8=28i. 8 B Different between primary & secondary texture. L1 Plug classifies the thread as to "Maximum", "Basic" or "Minimum" L3 Plug must match the classification of the L1 plug within +/- 1/2 turns. Plug Gauge is a cylindrical shaped Go and Not-Go type Gauge. A typical plug gage resembles a rod whose ends are carefully fashioned so that one end is the upper limit while the other end is the lower limit. Rockwell, Brinell, and Vickers Metal Hardness Tests: What’s the Difference? Can Your Company Help Provide Critical Supplies? Also known as pin gauges, these are used for precision go/no-go measuring of hole sizes and depths, checking hole location and distance, and setting micrometers. The L-3 Plug Inspects the Taper and Wrench Tight (L-3) Length of Engagement. For measurement of internal and external diameters, ASME/ANSI standard plain ring gages, plug gages or set disc are typically used for most applications. Plug gauges check for the complimentary condition to that of ring gauges, which we cover in our related guide All About Ring Gauges. Calliper Gauge: A calliper gauge is similar to a snap gauge, but it is used to check both the inside … Hexalobe plug gauges for use in checking the fit and tolerance of 6-point star-shaped pattern cuts for TORX. 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