{"product_id":"spi-20-979-1-ball-needle-contact-point-4-48-thread","title":"Spi 20-979-1 Ball Needle Contact Point 4-48 Thread","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 20-979-1 is a ball needle contact point designed for use with dial indicators in precision measurement applications. Machined from chrome alloy steel, this contact point features a 0.75-inch length and a 0.2188-inch ball diameter, with a 4-48 thread size that conforms to AGD Group 1 industry standards. It is a direct-fit replacement tip for dial indicator spindles requiring a fine-thread, ball-style stylus. Metrology technicians, machinists, and quality control professionals use this type of contact point when measuring bores, grooves, or recessed surfaces where a standard flat contact cannot reach.\u003c\/p\u003e\n\u003cp\u003eThis contact point is suited for bench and floor-level inspection setups in machine shops, manufacturing environments, and tool rooms. It threads onto the spindle of AGD Group 1 dial indicators and is appropriate for both surface plate inspection and fixture-mounted indicator configurations. Its ball needle profile makes it well suited for applications requiring contact in confined or curved geometry locations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBall needle style tip for access to recessed and curved measurement surfaces\u003c\/li\u003e\n  \u003cli\u003eChrome alloy steel construction for wear resistance and consistent contact\u003c\/li\u003e\n  \u003cli\u003e0.75-inch contact point length provides reach for confined measurement locations\u003c\/li\u003e\n  \u003cli\u003e0.2188-inch ball diameter for precise point contact\u003c\/li\u003e\n  \u003cli\u003e4-48 threaded shank conforms to AGD Group 1 standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with AGD Group 1 dial indicators accepting a 4-48 threaded contact point.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by hand-threading the contact point onto the dial indicator spindle until snug — do not overtighten, as the fine 4-48 thread is easily damaged. Verify the indicator reads zero correctly after swapping contact points, and re-establish your datum before taking measurements. No special tools are required, though needle-nose pliers with jaw protection can assist if the tip is stubborn.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: 0.2188 inches\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\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: 20-979-1\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51693184090418,"sku":"20-979-1","price":15.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/91f65bfe03f7061d3f35601b9ed650fa.jpg?v=1788308561","url":"https:\/\/voomisupply.com\/products\/spi-20-979-1-ball-needle-contact-point-4-48-thread","provider":"Voomi Supply","version":"1.0","type":"link"}