{"product_id":"spi-20-646-6-drop-indicator-contact-point-extension-4-in","title":"Spi 20-646-6 Drop Indicator Contact Point Extension 4 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 20-646-6 is a 4-inch contact point extension designed for use with drop indicators and dial indicators in dimensional measurement applications. Machined from steel, it threads directly onto the spindle using a standard 4-48 thread, extending the reach of the contact point to access recessed bores, deep slots, and other hard-to-reach measurement surfaces. This extension is a standard accessory used by machinists, toolmakers, quality control technicians, and calibration professionals working with dial indicator setups on surface plates, CMMs, and fixture-mounted gaging systems.\u003c\/p\u003e\n\u003cp\u003eThe 20-646-6 is suited for any application where the standard contact point stem is too short to reach the measurement surface. Common uses include measuring inside bores, deep counterbores, stepped surfaces, and confined features where indicator clearance is limited. The 4-48 thread is a widely used standard for dial indicator contact points, making this extension broadly compatible across a range of indicator brands and configurations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4-inch length extends contact point reach for deep or recessed measurement surfaces\u003c\/li\u003e\n  \u003cli\u003eSteel construction provides rigidity and durability under repeated use\u003c\/li\u003e\n  \u003cli\u003eStandard 4-48 thread fits a wide range of dial and drop indicators\u003c\/li\u003e\n  \u003cli\u003eLightweight at 0.15 pounds, minimizing added mass on the indicator spindle\u003c\/li\u003e\n  \u003cli\u003eConsistent thread form supports accurate, repeatable indicator readings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with any test indicator or dial indicator that accepts a standard 4-48 threaded contact point.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires no special tools beyond a firm hand-thread connection to the indicator spindle. Ensure the indicator is removed from any active measurement setup before attaching or removing the extension. Do not overtighten, as the 4-48 thread is fine and can be damaged by excessive torque. Verify that the extended contact point clears all fixture components before taking measurements to avoid false readings or indicator damage.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-48\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.15 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: 20-646-6\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51710471110962,"sku":"20-646-6","price":15.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/407d3604dead6879a0a0e922a99d206c.jpg?v=1788467352","url":"https:\/\/voomisupply.com\/products\/spi-20-646-6-drop-indicator-contact-point-extension-4-in","provider":"Voomi Supply","version":"1.0","type":"link"}