{"product_id":"spi-30-428-7-small-hole-gage-0-3-to-0-4-inch-half-ball","title":"Spi 30-428-7 Small Hole Gage 0.3 to 0.4 Inch Half Ball","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 30-428-7 is a small hole gage designed for precision inside measurement of bores, holes, and slots in the 0.3 to 0.4 inch range. The half ball contact style allows the gage to seat cleanly inside a drilled or reamed hole, giving the technician a consistent feel when expanding the contact to the bore wall. Overall length is 3 inches, with a gage depth of 1.6 inches. The satin chrome finish reduces glare and resists corrosion during regular shop use. Machinists, toolmakers, and maintenance technicians use this type of gage in conjunction with an outside micrometer to transfer and record bore dimensions accurately.\u003c\/p\u003e\n\u003cp\u003eThis small hole gage is suited for shop floor and maintenance applications where small-bore dimensional verification is required. Typical uses include checking drilled holes, pin bores, valve guides, and similar features on both production and repair work. The compact 3 inch overall length makes it easy to maneuver in tight setups. It is appropriate for both light industrial and precision machining environments where hand tools are the standard method of bore measurement.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eMeasurement range of 0.3 to 0.4 inches for small bore applications\u003c\/li\u003e\n  \u003cli\u003eHalf ball contact style provides consistent, repeatable seating inside the bore\u003c\/li\u003e\n  \u003cli\u003e1.6 inch gage depth reaches into typical drilled and reamed holes\u003c\/li\u003e\n  \u003cli\u003e3 inch overall length for easy single-hand operation\u003c\/li\u003e\n  \u003cli\u003eSatin chrome finish minimizes glare and provides corrosion resistance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard small hole gage for use with outside micrometers or other transfer-measuring instruments to determine inside bore dimensions in the 0.3 to 0.4 inch range.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eSmall hole gages are hand tools that require no installation. Before use, ensure the bore being measured is clean and free of chips or burrs that could affect contact seating. Expand the gage gently inside the bore until light drag is felt, then withdraw and measure across the contact with a calibrated outside micrometer. Avoid overtightening the knurled adjusting knob, as this can distort the contact and affect reading accuracy.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMeasurement Range\u003c\/strong\u003e: 0.3 to 0.4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGage Depth\u003c\/strong\u003e: 1.6 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBall Style\u003c\/strong\u003e: Half Ball\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Satin Chrome\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.06 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SPI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 30-428-7\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51692916277554,"sku":"30-428-7","price":54.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/53fe873680da1026af457a1efb678afc.jpg?v=1788304925","url":"https:\/\/voomisupply.com\/products\/spi-30-428-7-small-hole-gage-0-3-to-0-4-inch-half-ball","provider":"Voomi Supply","version":"1.0","type":"link"}