{"product_id":"hex-head-cap-screws-grade-8-steel-plain-5-16-18-x-1-3-8_3122ch8pbb","title":"[1000 BULK] Hex Head Cap Screws Grade 8 Steel Plain  5\/16-18 x 1-3\/8","description":"\u003cdiv\u003e\n\u003cp\u003eEngineered for high-load performance, these Hex Head Cap Screws are Grade 8 steel with a plain, uncoated finish. Sized at 5\/16-18 UNC by 1-3\/8 in length, they deliver outstanding tensile strength for demanding applications.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cb\u003eGrade 8 steel\u003c\/b\u003e provides superior strength and toughness for critical joints.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003ePlain finish\u003c\/b\u003e means no plating; ideal for interiors or when coating is applied separately.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eThread size\u003c\/b\u003e: 5\/16-18 UNC, coarse thread for quick assembly and easy alignment.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eLength\u003c\/b\u003e: 1-3\/8 in overall length.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eHead style\u003c\/b\u003e: Hex head cap screw for reliable, multi-point driving with common tools.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eStrength\u003c\/b\u003e: Approx 150 ksi (about 1030 MPa) tensile strength; suitable for high-load applications.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eUsage\u003c\/b\u003e: Use with matching nuts or tapped holes; ideal for machinery, automotive, industrial equipment, and construction assemblies.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eCare\u003c\/b\u003e: Not corrosion-protected; store in dry environments or apply appropriate finishes for outdoor use.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eThread: 5\/16-18 UNC\u003c\/li\u003e \u003cli\u003eDiameter: 5\/16 in\u003c\/li\u003e \u003cli\u003eLength: 1-3\/8 in\u003c\/li\u003e \u003cli\u003eHead type: Hex Head Cap Screw\u003c\/li\u003e \u003cli\u003eFinish: Plain\u003c\/li\u003e \u003cli\u003eMaterial: Grade 8 steel\u003c\/li\u003e \u003cli\u003eTensile strength: ~150 ksi (? 1030 MPa)\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThese high-strength fasteners are ideal for automotive, industrial machinery, equipment assemblies, and other demanding applications where reliability matters. Choose Hex Head Cap Screws Grade 8 Steel Plain 5\/16-18 x 1-3\/8 for secure, durable performance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Mutual Screw","offers":[{"title":"Default Title","offer_id":50348988858647,"sku":"3122CH8PBB","price":134.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/hex_cap_screw_plain_steel1_dd49d758-2ceb-40bb-97eb-829e4e0a8616.gif?v=1744980895","url":"https:\/\/mutualscrew.com\/products\/hex-head-cap-screws-grade-8-steel-plain-5-16-18-x-1-3-8_3122ch8pbb","provider":"Mutual Screw \u0026 Supply","version":"1.0","type":"link"}