{"product_id":"value-collection-d39450-hex-head-cap-screw-5-8-18","title":"Value Collection D39450 Hex Head Cap Screw 5\/8-18","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION D39450 is a partially threaded hex head cap screw designed for high-strength fastening applications in mechanical, structural, and industrial assembly work. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade hardware. The 5\/8-18 UNF thread profile provides fine-thread engagement suited to applications requiring precise torque control and resistance to vibration loosening. The 2-1\/4-inch length under head makes it appropriate for moderate-depth through-bolt and tapped-hole installations. Meets ASME B18.2.1 standards for dimensional accuracy and mechanical performance.\u003c\/p\u003e\u003cp\u003eThis cap screw is used across a wide range of trade and industrial applications, including HVAC equipment mounting, plumbing fixture frames, electrical enclosure assembly, and general mechanical fabrication. The fine 5\/8-18 UNF thread is commonly found in precision-fit assemblies where standard coarse-thread hardware is not specified. Partially threaded construction ensures a smooth shank section beneath the head, providing clamp load without thread engagement through the full grip length. Suitable for use by millwrights, pipefitters, HVAC installers, and general maintenance technicians.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eGrade 8 steel construction provides high tensile and proof load strength\u003c\/li\u003e\n\u003cli\u003eZinc yellow dichromate finish offers corrosion and oxidation resistance\u003c\/li\u003e\n\u003cli\u003e5\/8-18 UNF fine-thread profile for vibration-resistant fastening\u003c\/li\u003e\n\u003cli\u003ePartially threaded shank allows full clamping force across the grip\u003c\/li\u003e\n\u003cli\u003eMeets ASME B18.2.1 dimensional standards for consistent fitment\u003c\/li\u003e\n\u003cli\u003e2-1\/4-inch length under head suits moderate-depth fastening applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard inch-series hex head cap screw compatible with any 5\/8-18 UNF tapped hole or matching nut conforming to ASME B18.2.1 specifications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified mechanic or tradesperson using a properly sized hex wrench or socket. Always verify the mating thread standard matches UNF 5\/8-18 before installation to avoid cross-threading. Apply thread-locking compound or hardened washers as required by the application or governing mechanical code. De-energize or depressurize any equipment before replacing or installing fasteners on live assemblies.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/8-18\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 2-1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Grade 8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish Coating\u003c\/strong\u003e: Zinc Yellow Dichromate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreading\u003c\/strong\u003e: Partially Threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensional Standard\u003c\/strong\u003e: ASME B18.2.1\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: 0.01 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: VALUE COLLECTION\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: D39450\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51692924797234,"sku":"D39450","price":17.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1e3d376ed608b6c149226d7816c341b6.jpg?v=1788305049","url":"https:\/\/voomisupply.com\/products\/value-collection-d39450-hex-head-cap-screw-5-8-18","provider":"Voomi Supply","version":"1.0","type":"link"}