BOLD MAGENTA part numbers are new for 2026 PARTS-UNLIMITED.COM 2026 | OFFROAD CHAINS CHAINS 724 SIZE AND TYPE WEAR LIFE INDEX AVG. TENSILE STRENGTH (LBS.) MAXIMUM ENGINE CC STREET/DIRT STANDARD M420 100 4,000 125/90 M428 100 4,500 150/125 M520 100 6,800 250/250 M525 100 6,800 400/NA M530 100 6,800 400/NA HEAVY DUTY GB420MXZ 200 4,980 150/150 GB428MXZ1 200 6,070 150/150 SIZE AND TYPE WEAR LIFE INDEX AVG. TENSILE STRENGTH (LBS.) MAXIMUM ENGINE CC STREET/DIRT HEAVY DUTY (CONT) GB428MXZ4 450 6,400 150/150 GB420MXZ4 450 4,980 150/150 GB520MXZ5 450 8,500 NA/500 GB520EXW/520EXW 3,300 7,700 NA/750 SEALED RING 520XRE 3,500 8,200 800/800 GB520MXU 3,200 8,000 NA/500 RK CHAIN ORDER CHART • RK chain is available cut-to-length or in bulk in 25 ft. rolls; pre-cut lengths are individually boxed with a clip-type connecting link and all bulk rolls include clip-type connecting links RK CHAINS •All RK chains are pre-stressed and pre-stretched to ensure equal load distribution and minimal maintenance • They’re made of the highest grade, medium-carbon-alloy steel available, with all components shot-peened and heat-treated •RK chains are available cut-to-length or bulk and individually boxed with a clip-type connecting link M420 (NATURAL) – CUT-TO-LENGTH DESCRIPTION PART # 72 1220-0391 76 1220-0392 84 RKM42084 86 1220-0393 100 RKM420100 104 RKM420104 DESCRIPTION PART # 110 RKM420110 112 1220-0394 114 RKM420114 120 RKM420120 124 1220-0397 126 1220-0398 DESCRIPTION PART # 128 1220-0399 130 RKM420130 132 1220-0400 136 1220-0401 Clip connecting link R18-M422 M428 (NATURAL ) – CUT-TO-LENGTH DESCRIPTION PART # 100 1220-0403 110 RKM428110 112 RKM428112 118 RKM428118 DESCRIPTION PART # 120 RKM428120 126 RKM428126 130 RKM428130 132 RKM428132 DESCRIPTION PART # 134 1220-0404 136 1220-0405 Clip connecting link R18-M430 M520 (NATURAL) – CUT-TO-LENGTH OR BULK DESCRIPTION PART # 82 RKM52082 84 RKM52084 86 RKM52086 88 RKM52088 90 RKM52090 92 RKM52092 96 RKM52096 98 RKM52098 DESCRIPTION PART # 100 RKM520100 102 RKM520102 104 RKM520104 106 RKM520106 108 RKM520108 110 RKM520110 112 RKM520112 114 RKM520114 DESCRIPTION PART # 116 RKM520116 118 RKM520118 120 RKM520120 130 RKM520130 25’ bulk chain R18-M521 Clip connecting link R18-M522 STANDARD (M) •Heat-treated medium carbon alloy steel construction •All components heat-treated and shot-peened for maximum strength •Chains include clip connecting link
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