BOLD MAGENTA part numbers are new for 2025 CHAINS PARTS-UNLIMITED.COM OFFROAD | 2025 CHAINS 731 SPECIFICATIONS CHAIN TYPE TENSILE STRENGTH (LBS.) MAX ENGINE CC STREET/D IRT COLOR CONNECTING LINK TYPE CONNECTING LINK COLOR STANDARD 420 4,300 80/80 Natural Clip Natural 428 4,400 100/80 Natural Clip Natural 520 7,400 250/125 Natural Clip Natural 525 7,400 350/NA Natural Clip Natural SR HEAVY-DUTY 420 4,520 80/80 Black Clip Black 428 4,900 125/80 Natural Clip Natural 520 8,000 350/250 Natural Clip Natural GENERAL PURPOSE NON-SEALED CHAIN SR HEAVY-DUTY CONNECTING LINKS DESCRIPTION COLOR PART # 420 clip connecting link Black K18-5258 DESCRIPTION COLOR PART # 428 clip connecting link Natural K18-5027 DESCRIPTION COLOR PART # 520 clip connecting link Natural K18-5031 SR HEAVY-DUTY CUT-TO-LENGTH CHAIN NO. OF LINKS COLOR PART # 420 120 Black K420SR-120 132 Black K420SR-132 428 100 Natural K428SR-100 118 Natural K428SR-118 NO. OF LINKS COLOR PART # 428 (CONT) 120 Natural K428SR-120 124 Natural K428SR-124 130 Natural K428SR-130 132 Natural K428SR-132 NO. OF LINKS COLOR PART # 520 100 Natural K520SR-100 110 Natural K520SR-110 114 Natural K520SR-114 116 Natural K520SR-116 120 Natural K520SR-120 STANDARD CONNECTING LINKS DESCRIPTION COLOR PART # 420 clip connecting link Natural K18-5007 428 clip connecting link Natural K18-5011 DESCRIPTION COLOR PART # 520 clip connecting link Natural K18-5015 525 clip connecting link Natural K18-5019 STANDARD CUT-TO-LENGTH CHAIN NO. OF LINKS COLOR PART # 420 82 Natural K420-82 86 Natural K420-86 96 Natural K420-96 100 Natural K420-100 104 Natural K420-104 110 Natural K420-110 120 Natural K420-120 130 Natural K420-130 132 Natural K420-132 NO. OF LINKS COLOR PART # 428 90 Natural K428-90 104 Natural K428-104 116 Natural K428-116 118 Natural K428-118 120 Natural K428-120 124 Natural K428-124 126 Natural K428-126 130 Natural K428-130 132 Natural K428-132 NO. OF LINKS COLOR PART # 520 90 Natural K520-90 100 Natural K520-100 110 Natural K520-110 114 Natural K520-114 116 Natural K520-116 120 Natural K520-120 130 Natural K520-130 525 120 Natural K525-120 STANDARD AND HEAVY-DUTY NON-SEALED CHAINS •Super-economical roller chain •Standard chains have two-point pin riveting •Heavy-duty SR chains come with four-point riveting and solid bushings for longer wear • Special steel alloy, solid roller and pre-stretched, shot-peened parts •Come with clip-type connecting link
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