{"product_id":"spi-21-992-3-test-indicator-ball-contact-point","title":"Spi 21-992-3 Test Indicator Ball Contact Point","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 21-992-3 is a stainless steel ball contact point designed for use with dial test indicators. It replaces or supplements the standard stylus tip, providing a spherical contact surface that improves accuracy on curved, contoured, or hard-to-reach surfaces. The ball diameter measures 0.078 inches (2.00 mm) and the overall contact point length is 0.61 inches (15.50 mm). Machinists, quality control technicians, and toolroom professionals install this contact point when inspecting bores, slots, or irregular part geometries where a standard pointed tip would deflect or produce inconsistent readings.\u003c\/p\u003e\n\u003cp\u003eThis contact point is intended for precision measurement applications in machine shops, manufacturing facilities, and inspection departments. It is specifically listed for use with the SPI Integral Series of test indicators. Typical applications include runout checks, surface parallelism verification, and feature-to-feature measurement on machined components. The stainless steel construction resists corrosion and maintains dimensional stability under normal shop conditions.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBall diameter of 0.078 inches (2.00 mm) for precise contact on curved and contoured surfaces\u003c\/li\u003e\n  \u003cli\u003eContact point length of 0.61 inches (15.50 mm) for reach into recessed features\u003c\/li\u003e\n  \u003cli\u003eStainless steel construction for corrosion resistance and long service life\u003c\/li\u003e\n  \u003cli\u003eTip diameter of 0.078 inches (2.00 mm) consistent with ball diameter for uniform contact geometry\u003c\/li\u003e\n  \u003cli\u003eSold as a single replacement point for direct swap installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with the SPI Integral Series of test indicators. Verify thread size and stem fitment against your specific indicator model before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eContact point replacement is typically performed by a machinist or metrology technician using hand tools. Remove the indicator from service before swapping the contact point to avoid damaging the indicator spindle or altering calibration. After installation, verify indicator calibration against a known reference standard before returning the instrument to production use. Do not overtighten the contact point stem, as excessive force can damage the indicator spindle threads.\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: 0.61 inches (15.50 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTip Diameter\u003c\/strong\u003e: 0.078 inches (2.00 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: 21-992-3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51697415913778,"sku":"21-992-3","price":17.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/613993f2b09673e31b2d31cbe7794a36.jpg?v=1788351436","url":"https:\/\/voomisupply.com\/products\/spi-21-992-3-test-indicator-ball-contact-point","provider":"Voomi Supply","version":"1.0","type":"link"}