{"product_id":"spi-20-338-0-cupped-ball-contact-point-3mm-4-48-thread","title":"Spi 20-338-0 Cupped Ball Contact Point 3mm 4-48 Thread","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 20-338-0 is a cupped ball contact point designed for use with dial indicators in precision measurement applications. Machined from solid carbide, this contact point provides a durable, wear-resistant tip that maintains accurate readings over extended use. It features a 4-48 thread size for secure attachment and measures 0.75 inches in length with a 3 mm ball diameter. The cupped ball geometry seats consistently against rounded or irregular workpiece surfaces, making it a reliable choice for quality control technicians and machinists who depend on repeatable indicator readings.\u003c\/p\u003e\n\u003cp\u003eThis contact point is suited for dimensional inspection, surface runout checks, and setup verification tasks in machine shops, toolrooms, and manufacturing environments. It conforms to AGD Group 1 standards, which govern the interface dimensions for dial indicators commonly used in industrial metrology. Technicians working with standard AGD-compatible dial indicators will find this a direct fit for routine replacement or application-specific tip changes.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction for long service life and wear resistance\u003c\/li\u003e\n  \u003cli\u003eCupped ball contact geometry for consistent seating on curved or irregular surfaces\u003c\/li\u003e\n  \u003cli\u003e3 mm ball diameter for precise point contact\u003c\/li\u003e\n  \u003cli\u003e4-48 thread for secure, tool-free hand-tightening onto standard indicator stems\u003c\/li\u003e\n  \u003cli\u003e0.75 inch contact point length\u003c\/li\u003e\n  \u003cli\u003eMeets AGD Group 1 industry designation for broad dial indicator compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with dial indicators meeting AGD Group 1 specifications. Fits indicators with a 4-48 threaded contact point stem.\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 stem — do not use pliers or wrenches directly on the ball tip, as this can damage the carbide surface. Before replacing a contact point, zero the indicator and verify the new tip length matches the original to avoid offset errors in your measurement setup. No special tools or trade licensing are required, though contact point selection and indicator setup should follow the metrology procedures established at your facility.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Style\u003c\/strong\u003e: Cupped Ball\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBall Diameter\u003c\/strong\u003e: 3 mm\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\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: 20-338-0\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51716044194098,"sku":"20-338-0","price":15.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e606c058304558b32d836bab11d6090d.jpg?v=1788521502","url":"https:\/\/voomisupply.com\/products\/spi-20-338-0-cupped-ball-contact-point-3mm-4-48-thread","provider":"Voomi Supply","version":"1.0","type":"link"}