{"product_id":"jergens-43904-thumb-screw-1-4-20-knurled-head-dog-point","title":"Jergens 43904 Thumb Screw 1\/4-20 Knurled Head Dog Point","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe JERGENS 43904 is a 1215 steel thumb screw with a knurled head and dog point tip, designed for tool-free manual adjustment and positive positioning in jigs, fixtures, and tooling applications. Finished in black oxide for corrosion resistance, it carries a 1\/4-20 UNC thread and measures 1-13\/16 inches in overall length. The knurled head provides a secure grip for hand-tightening without tools, while the dog point tip seats reliably into mating locating holes for repeatable positioning. This is a standard industrial fastener installed by machinists, toolmakers, maintenance technicians, and mechanical assemblers working with fixtures and mechanical assemblies.\u003c\/p\u003e\u003cp\u003eThis thumb screw is suited for use in precision tooling, workholding fixtures, machine guards, access panels, and general mechanical assemblies that require frequent manual adjustment or removal without tools. The dog point tip is specifically selected for applications requiring indexed or located positioning, where the tip engages a drilled or bored recess in the mating component. The 1\/4-20 UNC thread is one of the most common thread sizes in inch-measurement tooling and is widely used across industrial and light mechanical applications.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4-20 UNC thread for broad compatibility with standard inch-measurement tooling and fixtures\u003c\/li\u003e\n\u003cli\u003eKnurled head design enables tool-free hand-tightening and rapid adjustment\u003c\/li\u003e\n\u003cli\u003eDog point tip for positive seating in locating holes and indexed positioning\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish provides mild corrosion resistance and a clean appearance\u003c\/li\u003e\n\u003cli\u003e1215 steel construction delivers reliable strength for standard clamping and adjustment loads\u003c\/li\u003e\n\u003cli\u003eNo-shoulder configuration for straightforward through-hole or threaded insert installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard replacement or new-installation thumb screw for jigs, fixtures, and mechanical assemblies using 1\/4-20 UNC threaded holes requiring a knurled head with dog point tip.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation requires no special tools beyond hand pressure for thread engagement. Ensure the mating threaded hole or insert is clean and free of debris before installation. Do not exceed hand-tightening torque for this style of fastener, as over-torquing a knurled thumb screw can damage threads in softer mating materials. Verify the dog point tip aligns with the locating recess in the mating part before applying clamping force.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Knurled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Type\u003c\/strong\u003e: Dog Point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Length\u003c\/strong\u003e: 1\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Diameter\u003c\/strong\u003e: 5\/32 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1-13\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShoulder Type\u003c\/strong\u003e: Without Shoulder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: 1215 Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: TCMAI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.78 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: JERGENS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 43904\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JERGENS","offers":[{"title":"Default Title","offer_id":51997491167538,"sku":"43904","price":19.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d5a6c0f6baf54f7034a025897b046078.jpg?v=1789994166","url":"https:\/\/voomisupply.com\/products\/jergens-43904-thumb-screw-1-4-20-knurled-head-dog-point","provider":"Voomi Supply","version":"1.0","type":"link"}