{"product_id":"spi-21-996-4-test-indicator-ball-contact-point","title":"Spi 21-996-4 Test Indicator Ball Contact Point","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 21-996-4 is a ball-style contact point designed for use with dial test indicators in precision measurement applications. The contact tip is a 0.118-inch diameter stainless steel ball, and the overall contact point length is 0.64 inches. This replacement contact point threads into compatible test indicators and is used by machinists, tool-and-die makers, and calibration technicians who need accurate surface contact during indicator runout, alignment, or inspection work. The stainless steel construction resists wear and corrosion under typical shop conditions.\u003c\/p\u003e\n\u003cp\u003eThis contact point is suited for precision measurement environments including machine shops, toolrooms, and quality control inspection stations. It is used when checking bore runout, surface concentricity, or part alignment on milling machines, lathes, and surface plates. The ball tip geometry allows contact on curved or irregular surfaces where a flat or pointed tip would introduce cosine error or slip off the workpiece.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e0.118-inch (3.00 mm) stainless steel ball tip for contact on curved and flat surfaces\u003c\/li\u003e\n  \u003cli\u003eContact point length of 0.64 inches (16.30 mm) for standard indicator reach\u003c\/li\u003e\n  \u003cli\u003eStainless steel construction resists wear and corrosion in shop environments\u003c\/li\u003e\n  \u003cli\u003eReplacement-ready design for field or bench swapping without special tools\u003c\/li\u003e\n  \u003cli\u003eSold individually — package quantity of 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with the SPI Integral Series test indicators.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eContact points on dial test indicators are typically threaded and can be removed and reinstalled by hand or with a small wrench — avoid overtightening, which can damage the indicator spindle threads. Power-down or lock out any machine before mounting or repositioning an indicator and contact point assembly. Always verify indicator zeroing and contact point seating after a tip change before taking measurements.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBall Diameter\u003c\/strong\u003e: 0.118 inches (3.00 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Length\u003c\/strong\u003e: 0.64 inches (16.30 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTip Diameter\u003c\/strong\u003e: 0.118 inches (3.00 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Material\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Length\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Width\u003c\/strong\u003e: 0.13 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Height\u003c\/strong\u003e: 0.13 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: 21-996-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51714809233714,"sku":"21-996-4","price":17.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/fbb5c9a59596ce12928e08b1cedd359e.jpg?v=1788506476","url":"https:\/\/voomisupply.com\/products\/spi-21-996-4-test-indicator-ball-contact-point","provider":"Voomi Supply","version":"1.0","type":"link"}