{"product_id":"osg-1500300200-thread-limit-gage-4-40-unjc-3b-go-no-go","title":"Osg 1500300200 Thread Limit Gage 4-40 Unjc 3B Go No-go","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 1500300200 is a double-end Go\/No-Go thread limit gage designed to verify internal thread conformance to the 4-40 UNJC 3B classification. Machined from high-speed steel with a bright, uncoated finish, this gage checks both the minimum and maximum material condition of a tapped hole in a single tool. The Go end confirms the thread will accept a mating fastener, while the No-Go end confirms the thread has not been cut oversize. It ships calibrated and is ready for immediate use on the shop floor or in a quality inspection station.\u003c\/p\u003e\n\u003cp\u003eThis gage is suited for production inspection, incoming inspection, and field verification wherever 4-40 UNC or UNJC threaded holes are produced or assembled. Typical applications include precision machined components, aerospace hardware, and electronic assemblies where 4-40 threads are common. The double-end design keeps the Go and No-Go members on a single handle, reducing bench clutter and the risk of mixing up individual plug members during high-volume checking operations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eGo and No-Go members on a single double-end handle for efficient thread verification\u003c\/li\u003e\n  \u003cli\u003eCalibrated at the factory — ready to use out of the box without additional setup\u003c\/li\u003e\n  \u003cli\u003eHigh-speed steel construction provides wear resistance for extended service life\u003c\/li\u003e\n  \u003cli\u003eBright, uncoated finish allows easy visual inspection of the gage surface for wear or damage\u003c\/li\u003e\n  \u003cli\u003eConforms to 3B classification tolerance limits for 4-40 UNJC internal threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for inspection of internal threads conforming to the 4-40 UN(J)C 3B standard. Suitable for use wherever 4-40 UNC or UNJC tapped holes must be verified to Class 3B tolerance limits.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThread limit gages are inspection tools, not cutting tools — never force the gage into a tapped hole. The Go member should pass through the full thread length under hand pressure only; if resistance is felt, the thread may be undersize or contain chips and should be re-examined. The No-Go member should not enter more than two turns; entering beyond that indicates the thread is oversize. Store the gage in its protective case when not in use to prevent nicks or corrosion that would affect calibration accuracy.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40 UN(J)C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClassification\u003c\/strong\u003e: 3B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGage Type\u003c\/strong\u003e: Go\/No-Go Thread Limit Gage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Configuration\u003c\/strong\u003e: Double End\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCalibrated\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.045 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 41111607\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: OSG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1500300200\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51732941242674,"sku":"1500300200","price":240.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/88b9787c8de6ec9e78768e711b32f8a9_53fe8f2c-2c51-4c15-ba75-f1df096ec791.jpg?v=1788749232","url":"https:\/\/voomisupply.com\/products\/osg-1500300200-thread-limit-gage-4-40-unjc-3b-go-no-go","provider":"Voomi Supply","version":"1.0","type":"link"}