{"product_id":"spi-20-336-4-cupped-ball-contact-point-dial-indicator","title":"Spi 20-336-4 Cupped Ball Contact Point Dial Indicator","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 20-336-4 is a cupped ball contact point designed for use with dial indicators in precision measurement applications. Manufactured from solid carbide, it delivers consistent, wear-resistant contact across repeated measurement cycles. The M2.5 threaded shank provides a secure, standard-fit connection, while the 0.28-inch (7 mm) contact length and 3 mm ball diameter are sized to AGD Group 1 specifications. Metrology technicians, machinists, and quality control professionals rely on this style of contact point when checking part geometry, runout, or surface variation with dial indicators.\u003c\/p\u003e\n\u003cp\u003eThis contact point is suited for shop floor and laboratory environments where dial indicators are used for dimensional inspection, fixture setup, or machine calibration. The cupped ball geometry concentrates the measurement contact at a defined point, making it appropriate for flat, curved, and contoured surfaces. Its solid carbide construction resists abrasion when used on hardened workpieces or abrasive materials encountered in general machining and quality inspection workflows.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction for wear resistance during repeated measurement use\u003c\/li\u003e\n  \u003cli\u003eM2.5 threaded shank for standard dial indicator compatibility\u003c\/li\u003e\n  \u003cli\u003eCupped ball contact geometry suitable for flat and contoured surfaces\u003c\/li\u003e\n  \u003cli\u003eContact length of 0.28 inches (7 mm) to AGD Group 1 specification\u003c\/li\u003e\n  \u003cli\u003e3 mm ball diameter for focused, repeatable contact point\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with dial indicators accepting M2.5 threaded contact points, conforming to AGD Group 1 industry designation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by threading the M2.5 shank directly into the dial indicator spindle by hand or with the appropriate small wrench — avoid overtightening, which can damage the indicator spindle threads. Ensure the indicator is removed from service and the measurement stem is fully retracted before swapping contact points. Inspect the carbide tip for chips or flat spots before use, as contact point damage will introduce measurement error.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Style\u003c\/strong\u003e: Cupped Ball\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: M2.5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Length\u003c\/strong\u003e: 0.28 inches (7 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBall Diameter\u003c\/strong\u003e: 3 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndustry Designation\u003c\/strong\u003e: AGD Group 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: 20-336-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51694289617202,"sku":"20-336-4","price":15.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9549dda544efa73d7ac63b83ed4db65c.jpg?v=1788322687","url":"https:\/\/voomisupply.com\/products\/spi-20-336-4-cupped-ball-contact-point-dial-indicator","provider":"Voomi Supply","version":"1.0","type":"link"}