The particulars of our 420 and 428HD chains are as follows:
Chain JT 428 120 links
-High carbon Japanese steel SCM 435 surface hardened pins for wear resistance.
-High carbon Japanese steel SCM 415 rigid bushes to withstand a large pressure fitting force.
-Precision formed excellent impact resistance SWRCH 12A rollers.
-Leading edge in fatigue strength and rust free property plates
If your not sure on your chain pitch measure the width of the sprocket 6mm = 420 pitch and 7.3mm = 428 pitch
Why has my chain now got tight spots?
- Most common issue is the chain has been run tight “over adjusted” and it’s pull bent the pins out of shape making the side plates tight.
- Lack of lubrication
- Using a new chain on worn sprockets