{"product_id":"spi-21-994-9-test-indicator-ball-contact-point","title":"Spi 21-994-9 Test Indicator Ball Contact Point","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 21-994-9 is a ball-style contact point designed for use with test indicators in precision measurement applications. The contact tip features a 0.039-inch (1.00 mm) ball diameter and a contact point length of 0.59 inches (approximately 16.30 mm). Constructed from stainless steel, the tip resists corrosion and wear under repeated contact cycles. This contact point threads onto compatible test indicator spindles and is the correct choice when measuring curved surfaces, grooves, or bores where a ball tip provides more accurate and repeatable contact than a flat or conical tip. Machinists, quality control technicians, and toolroom professionals install this type of accessory as part of routine indicator setup.\u003c\/p\u003e\u003cp\u003eThe 21-994-9 is suited for use in machine shops, toolrooms, and quality inspection environments where SPI test indicators are in service. It is appropriate for both bench-mounted and surface-plate inspection work, as well as for in-machine measurements on mills and lathes. The small ball diameter allows contact in tight features and on small-radius curved surfaces. This contact point is a direct replacement or spare for setups that require a standard 1.00 mm ball tip.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBall diameter of 0.039 inches (1.00 mm) for contact on small curved and recessed surfaces\u003c\/li\u003e\n\u003cli\u003eContact point length of 0.59 inches (16.30 mm) for reach into confined measurement areas\u003c\/li\u003e\n\u003cli\u003eStainless steel construction for corrosion resistance and long service life\u003c\/li\u003e\n\u003cli\u003eCompatible with SPI Integral Series test indicators\u003c\/li\u003e\n\u003cli\u003eSold individually — package quantity of 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with SPI Integral Series test indicators.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eContact points are installed by threading them onto the indicator spindle — ensure the indicator is removed from any active measuring setup before changing tips. Use the appropriate small wrench or the tool supplied with the indicator to avoid overtightening, which can damage the spindle threads. Handle the ball tip carefully to avoid nicks or surface damage that would affect measurement accuracy.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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: 0.59 inches (16.30 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Diameter\u003c\/strong\u003e: 0.039 inches (1.00 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\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 21-994-9\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51699119751474,"sku":"21-994-9","price":17.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c7d7b84fe9cbb21809e154f3ebedd8b3.jpg?v=1788372445","url":"https:\/\/voomisupply.com\/products\/spi-21-994-9-test-indicator-ball-contact-point","provider":"Voomi Supply","version":"1.0","type":"link"}