{"product_id":"spi-21-251-4-flat-contact-point-dial-indicator","title":"Spi 21-251-4 Flat Contact Point Dial Indicator","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 21-251-4 is a flat contact point designed for use with dial indicators in precision measurement applications. Machined from black oxide steel, this contact point threads onto standard dial indicator stems using a 4-48 thread size conforming to AGD Group 1 specifications. The flat contact surface measures 3\/16 inch in diameter with a contact point length of 0.25 inches. It is a direct-fit replacement or spare tip for technicians who rely on dial indicators for runout, flatness, and surface comparison measurements in shop, field, or inspection environments.\u003c\/p\u003e\n\u003cp\u003eThis contact point is suited for machinists, quality control inspectors, and precision measurement technicians working with AGD Group 1 dial indicators. The flat contact geometry is appropriate for measurements on flat, smooth, or broad surfaces where a spherical point would introduce unwanted rocking or contact error. It fits standard 4-48 threaded indicator spindles and is a commonly stocked replacement tip for production and inspection setups.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eFlat contact point style for accurate surface contact on flat workpieces\u003c\/li\u003e\n  \u003cli\u003eBlack oxide steel construction for durability and corrosion resistance\u003c\/li\u003e\n  \u003cli\u003e4-48 thread size conforms to AGD Group 1 industry designation\u003c\/li\u003e\n  \u003cli\u003eContact point length of 0.25 inches (1\/4 inch)\u003c\/li\u003e\n  \u003cli\u003eContact point diameter of 3\/16 inch\u003c\/li\u003e\n  \u003cli\u003eSingle-piece package, no assembly required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with dial indicators that accept 4-48 threaded contact points per AGD Group 1 specifications.\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 with a 4-48 thread. Zero the indicator after changing contact points to account for any length variation. Avoid overtightening, which can damage the spindle threads. Handle with care to preserve the flat contact surface geometry and measurement accuracy.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Style\u003c\/strong\u003e: Flat\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Material\u003c\/strong\u003e: Black Oxide Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Length\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContact Point Diameter\u003c\/strong\u003e: 3\/16 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\u003ePackage Quantity\u003c\/strong\u003e: 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: 21-251-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51699465552178,"sku":"21-251-4","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/bd96fe682cd74af06ff1f32bb89641d6.jpg?v=1788376000","url":"https:\/\/voomisupply.com\/products\/spi-21-251-4-flat-contact-point-dial-indicator","provider":"Voomi Supply","version":"1.0","type":"link"}