{"product_id":"vlier-sch330-thumb-screw-1-4-20-knurled-head-steel","title":"Vlier SCH330 Thumb Screw 1\/4-20 Knurled Head Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VLIER SCH330 is a steel thumb screw designed for hand-tightening applications where no tools are required. It features a knurled head for a secure grip and a swivel pad tip that adjusts to uneven surfaces during clamping or positioning tasks. The screw has a 1\/4-20 UNC thread and measures 2.375 inches in overall length with a 1 inch head diameter and a 3\/8 inch head height. A black oxide finish provides mild corrosion resistance. This fastener is commonly installed by machinists, toolmakers, and mechanical assembly technicians in fixture, jig, and workholding setups.\u003c\/p\u003e\u003cp\u003eThis thumb screw suits light industrial and mechanical assembly applications where frequent manual adjustment is needed without tools. The swivel pad tip, with a 7.5-degree swivel angle, compensates for slight surface irregularities and distributes clamping load more evenly. It is a practical choice for use in drill fixtures, inspection setups, and machine tool accessories where quick-release or repeated repositioning is routine.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eKnurled head design enables hand tightening without tools\u003c\/li\u003e\n\u003cli\u003eSwivel pad tip with 7.5-degree swivel angle accommodates uneven contact surfaces\u003c\/li\u003e\n\u003cli\u003e1\/4-20 UNC thread standard for broad compatibility with inch-system hardware\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish provides mild corrosion and wear resistance\u003c\/li\u003e\n\u003cli\u003eWithout-shoulder configuration for straightforward through-hole installation\u003c\/li\u003e\n\u003cli\u003eManufactured to ISO 9001 quality standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard 1\/4-20 UNC inch-system thumb screw suitable for use in tooling fixtures, jigs, and mechanical assemblies that accept this thread size and head style.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis thumb screw is installed by hand or with light tool assistance into a tapped 1\/4-20 UNC hole. Ensure the mating thread is clean and free of debris before installation. Do not overtighten, as the knurled head and swivel tip are intended for hand-load applications only. Verify that the swivel pad has full contact with the work surface 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\u003eOverall Length\u003c\/strong\u003e: 2.375 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: 3\/8 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Diameter\u003c\/strong\u003e: 0.185 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Swivel Angle\u003c\/strong\u003e: 7.5 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Knurled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShoulder Type\u003c\/strong\u003e: Without Shoulder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Type\u003c\/strong\u003e: Swivel Pad\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertification\u003c\/strong\u003e: ISO 9001\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: VLIER\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: SCH330\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":52087416127794,"sku":"SCH330","price":68.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9db26de3e99cb95bcc792ac65315c5cf.jpg?v=1790060313","url":"https:\/\/voomisupply.com\/products\/vlier-sch330-thumb-screw-1-4-20-knurled-head-steel","provider":"Voomi Supply","version":"1.0","type":"link"}