{"product_id":"spi-21-128-4-ball-contact-point-carbide-0-039-in","title":"Spi 21-128-4 Ball Contact Point Carbide 0.039 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 21-128-4 is a carbide ball contact point designed for use with Tesa test indicators. It provides a precise, wear-resistant contact surface for accurate measurement work in machinist, quality control, and metrology applications. The ball tip measures 0.039 inches in diameter, and the overall contact point length is 1.437 inches. The carbide construction resists wear during repeated use on hard surfaces, maintaining measurement integrity over time. This contact point is a standard replacement or spare component for technicians and machinists who rely on Tesa indicators for surface runout, bore alignment, and similar precision measurement tasks.\u003c\/p\u003e\n\u003cp\u003eThis contact point suits residential shop, manufacturing floor, and quality lab environments where Tesa test indicators are in service. It is appropriate for any application requiring a small-diameter ball tip contact, including checking shaft runout, bore concentricity, and part alignment. Machinists, toolroom technicians, and quality control inspectors are the primary users. The compact ball tip geometry allows access to tight spaces and angled surfaces where flat or pointed contacts are not suitable.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCarbide ball tip for extended wear life on hard workpiece surfaces\u003c\/li\u003e\n  \u003cli\u003eBall diameter of 0.039 inches for precise, low-contact-force measurement\u003c\/li\u003e\n  \u003cli\u003eContact point length of 1.437 inches for standard reach applications\u003c\/li\u003e\n  \u003cli\u003eCompatible with Tesa test indicators as a direct-fit replacement\u003c\/li\u003e\n  \u003cli\u003eSold individually, suitable for single-unit replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with Tesa test indicators as stated by the manufacturer.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or metrology technicians. Before replacing the contact point, remove the indicator from service and secure it in a stable holding fixture to avoid damage. Use the appropriate wrench or driver to avoid stripping the contact point thread. Handle the carbide tip carefully, as carbide is hard but brittle and can chip if dropped on a hard surface.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBall Diameter\u003c\/strong\u003e: 0.039 inches (1.00 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 Diameter\u003c\/strong\u003e: 0.039 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Material\u003c\/strong\u003e: Carbide\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: 21-128-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51722730864946,"sku":"21-128-4","price":37.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1fae152473697e4296279e45f255e3b0.jpg?v=1788595090","url":"https:\/\/voomisupply.com\/products\/spi-21-128-4-ball-contact-point-carbide-0-039-in","provider":"Voomi Supply","version":"1.0","type":"link"}