{"product_id":"spi-20-638-3-drop-indicator-contact-point-extension","title":"Spi 20-638-3 Drop Indicator Contact Point Extension","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SPI 20-638-3 is a 3\/4 inch drop indicator contact point extension designed to increase the reach of a dial indicator contact point during precision measurement work. Machined from steel, this extension uses a 4-48 thread to mount securely onto compatible dial and test indicators. It is a standard accessory in metrology and quality control environments where additional stylus depth or offset clearance is required to reach a recessed surface, bore, or hard-to-access feature. Machinists, tool and die makers, and quality technicians install this type of extension when the standard contact point cannot reach the target measurement surface directly.\u003c\/p\u003e\n\u003cp\u003eThis extension is suited for use in machine shops, production floors, and inspection labs. It applies to any setup where a dial or test indicator requires extended contact reach, such as measuring inside bores, recessed slots, or stepped surfaces. The 4-48 threaded connection is a common standard thread pitch used across a wide range of dial and test indicator contact points, making this a frequently stocked consumable for inspection tooling kits.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3\/4 inch extension length adds reach to standard contact points\u003c\/li\u003e\n  \u003cli\u003e4-48 thread size matches common dial and test indicator contact point threads\u003c\/li\u003e\n  \u003cli\u003eSteel construction provides durability and dimensional stability\u003c\/li\u003e\n  \u003cli\u003eCompact, lightweight design at 0.1 pounds\u003c\/li\u003e\n  \u003cli\u003eCompatible with a broad range of dial and test indicators per manufacturer application note\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 extension.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires no special tools — thread the extension onto the indicator contact point stem by hand and snug it carefully to avoid cross-threading the 4-48 thread. Ensure the indicator is removed from active measurement or the spindle is retracted before swapping contact point accessories. Verify the extension is fully seated and free of lateral play before taking measurements, as any looseness will introduce error into readings. This accessory is typically handled by machinists or quality technicians familiar with dial indicator setup and calibration procedures.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtension Length\u003c\/strong\u003e: 3\/4 inch\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: 0.1 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: 20-638-3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51720075084082,"sku":"20-638-3","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/33388e766cdd8a90e71f49faee259806.jpg?v=1788560690","url":"https:\/\/voomisupply.com\/products\/spi-20-638-3-drop-indicator-contact-point-extension","provider":"Voomi Supply","version":"1.0","type":"link"}