{"product_id":"spi-21-130-0-ruby-ball-contact-point-tesa-test-indicators","title":"Spi 21-130-0 Ruby Ball Contact Point Tesa Test Indicators","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 21-130-0 is a ruby ball contact point designed for use with dial-type test indicators in precision measurement applications. The ruby ball tip measures 0.078 inches in diameter and the full contact point length is 1.437 inches. Ruby is the preferred tip material for high-cycle gauging work because it resists wear and maintains dimensional accuracy far longer than carbide or steel alternatives. This contact point is installed by metrology technicians, QC inspectors, and machinists performing runout, concentricity, or surface variation checks.\u003c\/p\u003e\n\u003cp\u003eThis contact point is suited for inspection setups on machine tools, surface plates, and fixturing environments where a low-mass, accurate tip is required. Its ball-style geometry allows contact on curved and flat surfaces alike, making it a practical choice for a wide range of workpiece geometries in both production and tool-room settings.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eRuby ball tip for extended wear life in high-cycle inspection applications\u003c\/li\u003e\n  \u003cli\u003eBall diameter of 0.078 inches (2.00 mm) for precise point contact\u003c\/li\u003e\n  \u003cli\u003eContact point length of 1.437 inches for reach in standard indicator setups\u003c\/li\u003e\n  \u003cli\u003eDesigned for use with Tesa test indicators\u003c\/li\u003e\n  \u003cli\u003eLightweight construction at 0.1 pounds to minimize indicator stylus deflection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with Tesa test indicators as specified by the manufacturer.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eContact points are installed and removed by hand or with a small wrench depending on the thread style of the indicator stem — power down any automated gauging station before servicing. Avoid over-tightening the contact point, as this can damage the indicator spindle thread. Inspect the ruby ball for chips or flat spots before each use to ensure measurement integrity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBall Diameter\u003c\/strong\u003e: 0.078 inches (2.00 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Length\u003c\/strong\u003e: 1.437 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTip Material\u003c\/strong\u003e: Ruby\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFor Use With\u003c\/strong\u003e: Tesa Test Indicators\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 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: 21-130-0\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51722924196146,"sku":"21-130-0","price":35.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5e0208d84e816e0ed38a435ac380d522.jpg?v=1788597970","url":"https:\/\/voomisupply.com\/products\/spi-21-130-0-ruby-ball-contact-point-tesa-test-indicators","provider":"Voomi Supply","version":"1.0","type":"link"}