{"product_id":"caterpillar-131-0421","title":"CATERPILLAR 131-0421","description":"\u003cdiv class=\"productDescription\"\u003e\n\u003cspan style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; margin: 12px 0 16px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003eThe Caterpillar 131-0421 Fastener Group is a high-tensile, heavy-duty hardware bolt kit. It is specifically engineered to secure the cylinder head assembly down to the engine block deck, ensuring proper compression sealing and maintaining clamping torque under immense combustion chamber pressure.\u003cspan\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e\u003c\/div\u003e\n\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; font-weight: 700; margin: 24px 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e1. Core Dimensions \u0026amp; Weight\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cul style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; margin: 12px 0 16px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eAssembly Length: 310.00 mm (12.20 in)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eAssembly Width: 55.00 mm (2.17 in)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eAssembly Depth \/ Height: 55.00 mm (2.17 in)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\n\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eNet Weight: 0.73 kg (1.60 lbs)\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e\u003c\/div\u003e\n\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; font-weight: 700; margin: 24px 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e2. Material \u0026amp; Installation Torque Specs\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cul style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; margin: 12px 0 16px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eMaterial Grade: Ultra-high-strength forged alloy steel optimized for high-clamping load applications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eCoating \/ Finish: Corrosion-resistant black oxide finish to prevent thread binding and degradation in oil-wetted high-heat spaces.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eThread Treatment Note: Prior to assembly, clean and lubricate all bolt threads with clean engine oil.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003ePrimary Sealing Step 1 Torque: Tighten bolts to 30 ± 5 N·m (22 ± 4 lb-ft).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003ePrimary Sealing Step 2 Torque: Advance tightening sequence to 100 ± 15 N·m (74 ± 11 lb-ft).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003ePrimary Sealing Step 3 Torque: Increase torque load to 450 ± 15 N·m (330 ± 11 lb-ft).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eFinal Step Torque: Turn the fastener group to an additional sequence angle of 180 ± 5 degrees.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\n\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003ePost-Torque Step: Retighten auxiliary positions to 490 ± 15 N·m (360 ± 11 lb-ft).\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e\u003c\/div\u003e\n\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; font-weight: 700; margin: 24px 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e3. Equipment \u0026amp; Engine Compatibility\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; margin: 12px 0 16px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003eThis fastener group is an essential layout component designed to match the wide-bore Caterpillar 3500 engine architectures:\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cul style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; margin: 12px 0 16px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eDiesel Engine Series: CAT 3508, 3508B, 3512, 3512B, 3512C, 3516, 3516B, and high-displacement 3524B mining power blocks.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\n\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eMachine \u0026amp; Generator Groups: Extensively utilized in Caterpillar Engine-Machine systems, marine heavy propulsion rigs, and large-scale industrial generator sets.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e\u003c\/div\u003e\n\u003cdiv style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; font-weight: 700; margin: 24px 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e4. Part Cross-References \u0026amp; Kinship\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cul style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; margin: 12px 0 16px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)'\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eComponent Assembly Mix: Includes 7N-1961 heavy-duty cylinder head bolts.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eDirect System Twin: Often paired on the same engine block architecture alongside the 131-0420 Cylinder Head Fastener Group.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"margin: 0 0 12px; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eAlternative Part Numbers: 1310421, 131-0421.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cbr\u003e","brand":"APSS Store","offers":[{"title":"Default Title","offer_id":58617647333679,"sku":"APSS-ITEM-00004754","price":0.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5826\/9231\/files\/BC_Upload_144d74bb-58a2-4eb6-8063-a3e45c8bdaaa.png?v=1791365352","url":"https:\/\/onlinestore.apss.com\/products\/caterpillar-131-0421","provider":"APSS Store","version":"1.0","type":"link"}