Order Today to get your equipment back to in top shape. John Deere Tractor Mounted RotoTiller Drive Chain OE Fit Endless Loop Chains to replace originals in JD 40 Chain Case These are a continuous endless loop and do not incorporate an Offset Link or Master Link. Made Rugged to ANSI specs to meet OEM specifications with hardened solid steel rollers and pins. Shot peened side plates for stress relief and longer service life. Bulk Packaged - No retail packaging. Minor disassembly required for installation. Roller Count: 56 Chain Pitch: 0.750" Roller Diameter: 0.468" Roller Width: 0.500" Pin Diameter: 0.234" Plate Thickness: 0.094" Tensile strength: 8500 Pounds If your drive chain is making a popping / clicking noise or sounds like it is binding when it runs, not running as quiet as it once did , the chain is worn/stretched beyond it's service limit and ready to fail. Order replacements now to have on hand for the inevitable. Please measure and verify the actual # of links or the overall length of your drive chain before ordering. If the chain you need is longer or shorter, contact us, we will make one especially for your needs.