{"product_id":"spi-20-978-3-ball-needle-contact-point-dial-indicators","title":"Spi 20-978-3 Ball Needle Contact Point Dial Indicators","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 20-978-3 is a ball needle contact point designed for use with dial indicators in precision measurement applications. Manufactured from chrome alloy steel, this contact point features a 3\/16 inch ball diameter and a contact point length of 0.75 inches. The tip threads into AGD Group 1 dial indicators using a 4-48 thread specification. Metrology technicians, machinists, and quality control professionals install this type of contact point when setting up dial indicators for bore gauging, surface runout checks, and other inspection tasks that require a rounded contact profile.\u003c\/p\u003e\u003cp\u003eThis contact point suits light-duty precision measurement work in machine shops, manufacturing facilities, and tool rooms. It is intended for use with dial indicators that accept 4-48 threaded contact points conforming to AGD Group 1 standards. The ball needle style is chosen when a small, spherical contact surface is needed to minimize contact area on curved or irregular workpiece surfaces.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eChrome alloy steel construction for durability and wear resistance\u003c\/li\u003e\n\u003cli\u003eBall needle style provides a small spherical contact area for curved surfaces\u003c\/li\u003e\n\u003cli\u003e3\/16 inch ball diameter for precise point contact\u003c\/li\u003e\n\u003cli\u003e0.75 inch contact point length fits standard AGD Group 1 indicator stems\u003c\/li\u003e\n\u003cli\u003e4-48 threaded shank for secure attachment to compatible dial indicators\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a replacement or spare contact point for dial indicators accepting 4-48 threaded tips conforming to AGD Group 1 specifications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis contact point is installed by hand or with light tool assistance by machinists or metrology technicians. Thread the contact point carefully into the dial indicator spindle to avoid cross-threading the fine 4-48 thread. Do not overtighten, as excess torque can damage the indicator spindle or contact point threads. Verify indicator zero and calibration after any contact point change.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Point Style\u003c\/strong\u003e: Ball Needle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Material\u003c\/strong\u003e: Chrome Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Point Length\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBall Diameter\u003c\/strong\u003e: 0.1875 inches (3\/16 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry Designation\u003c\/strong\u003e: AGD Group 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Use With\u003c\/strong\u003e: Dial Indicators\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 pounds\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: 20-978-3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51722746134834,"sku":"20-978-3","price":15.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8de3c263e0f951d8fee4ab6f93486956.jpg?v=1788595273","url":"https:\/\/voomisupply.com\/products\/spi-20-978-3-ball-needle-contact-point-dial-indicators","provider":"Voomi Supply","version":"1.0","type":"link"}