{"product_id":"caterpiller-187-7738","title":"CATERPILLER 187-7738","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)'\u003e\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eThe Caterpillar 187-7738 Flat Hard Washer is a high-tensile, heavy-duty structural distribution fastener. It is engineered to maintain extreme clamping force, provide a stable load-bearing surface, and prevent joint relaxation or deformation across high-stress engine block assemblies, cylinder heads, and chassis structures subject to relentless machine vibrations and cyclic loading.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/span\u003e\u003col 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\n\u003cspan style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eCore Dimensions \u0026amp; Fastener Specs\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eFits Bolt Size: 3\/4 inch (M20 equivalent)\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eInner Diameter (ID): 21.00 mm (0.827 in)\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eOuter Diameter (OD): 36.50 mm (1.437 in)\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eWasher Thickness: 3.50 mm (0.138 in)\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eWasher Type: Hardened Flat Washer\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\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)\"\u003eMaterial \u0026amp; Manufacturing Specs\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eMaterial Grade: Premium high-strength hardened structural steel.\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eCoating \u0026amp; Finish: Industrial zinc phosphate and oil coating providing up to 72 hours of red rust salt spray resistance, engineered to eliminate friction spikes and prevent surface corrosion prior to assembly.\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eColor \/ Appearance: Dark grey to black.\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eDesign Optimization: Hardened profile eliminates washer dishing or structural deformation when subjected to heavy-duty torque ratings during installation.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\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)\"\u003eEquipment \u0026amp; System Compatibility\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eThis high-fatigue hardened structural washer is standard heavy-duty hardware deployed across a vast selection of large-scale Caterpillar heavy machinery, marine propulsion systems, and high-horsepower engine platforms:\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eEngine Platforms: Commonly paired with heavy-duty 12-point head cylinder head bolts (such as 7N-1961) inside critical fastener groups and cylinder head assemblies for high-displacement CAT engine divisions.\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eHeavy Machinery: Heavily utilized within high-load chassis panels, suspension mounting brackets, structural linkages, and critical powertrain system enclosures across Caterpillar equipment fleets.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\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)\"\u003ePart Cross-References\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eAlternative Part Names: Hard Washer, Hardened Flat Washer, Structural Washer.\u003cbr style=\"margin: 0; text-decoration: none; border-bottom: 0 rgba(230, 232, 240, 1)\"\u003eAlternative Part Numbers: 1877738, 187-7738.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\u003cbr\u003e","brand":"APSS Store","offers":[{"title":"Default Title","offer_id":58617649332527,"sku":"APSS-ITEM-00007539","price":0.0,"currency_code":"IDR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5826\/9231\/files\/BC_Upload_779769b2-ee11-43fb-8afc-f9e96b55044f.png?v=1791365383","url":"https:\/\/estore.apss-id.com\/id\/products\/caterpiller-187-7738","provider":"APSS Store","version":"1.0","type":"link"}