{"product_id":"value-collection-101339pr-set-screw-1-4-28-x-5-16-in-cup-point","title":"Value Collection 101339PR Set Screw 1\/4-28 X 5\/16 in Cup Point","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 101339PR is a 1\/4-28 UNF cup point set screw manufactured from Grade 8 alloy steel. At 5\/16 inches in overall length, this headless fastener is driven with a 1\/8-inch hex key and seats firmly into a mating bore via its cup point, which bites into the shaft surface to resist rotational and axial movement. Conforming to ASME\/ANSI B18.3 and ASTM F912 standards, this set screw is suited for applications where a flush or recessed fastener is required and holding strength is a priority. Machinists, maintenance technicians, and assemblers working in industrial and mechanical environments are the typical installers.\u003c\/p\u003e\n\u003cp\u003eThis set screw is commonly used in mechanical assemblies where a collar, pulley, sprocket, knob, or similar component must be locked onto a shaft without a protruding fastener head. The fine 1\/4-28 UNF thread pitch provides precise engagement and is well matched to applications requiring vibration resistance or fine adjustment. Typical use cases include motor shaft collars, gear hubs, and valve stems in both light industrial and OEM manufacturing contexts. This SKU is sold individually but carries a minimum order quantity of 100 pieces.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-28 UNF fine thread for precise engagement and improved vibration resistance\u003c\/li\u003e\n  \u003cli\u003eCup point geometry bites into shaft surface for firm rotational and axial holding\u003c\/li\u003e\n  \u003cli\u003eGrade 8 alloy steel construction provides high tensile and torsional strength\u003c\/li\u003e\n  \u003cli\u003e1\/8-inch hex drive allows installation in confined spaces with a standard hex key\u003c\/li\u003e\n  \u003cli\u003eMeets ASME\/ANSI B18.3 and ASTM F912 fastener standards\u003c\/li\u003e\n  \u003cli\u003eHeadless design sits flush or below the workpiece surface\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard 1\/4-28 UNF cup point set screw per ASME\/ANSI B18.3, suitable for use in any application that accepts this thread size, point type, and drive specification.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or mechanical technicians using a 1\/8-inch hex key or Allen wrench. Ensure the mating bore is properly tapped to 1\/4-28 UNF before installation. De-energize and lock out any rotating equipment before installing or removing set screws on live shafts. Do not exceed the rated torque capacity of the screw or the tapped bore material, and inspect threads for damage before reuse.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-28 UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 5\/16 inches (overall)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Cup\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive Type\u003c\/strong\u003e: Hex\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHex Key Size\u003c\/strong\u003e: 1\/8 inch (0.1250 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Alloy Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Grade 8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFastener Standard\u003c\/strong\u003e: ASME\/ANSI B18.3, ASTM F912\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMeasurement Type\u003c\/strong\u003e: Fractional Inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31161505\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: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 101339PR\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51723692540210,"sku":"101339PR","price":1571.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/edeb549c51251a06bfda5e82daf922e3.jpg?v=1788607446","url":"https:\/\/voomisupply.com\/products\/value-collection-101339pr-set-screw-1-4-28-x-5-16-in-cup-point","provider":"Voomi Supply","version":"1.0","type":"link"}