Toplink eye/eye 490, M30 cat. Connection category Eye -Eye. Category by tractor side 2. Category by machine side 2. Rod outside diameter 48.3mm. Minimum working length 635mm. Maximum working length 835mm. Thread pitch 3.50mm. Connection hole diameter by tractor side 25.7mm. Connection hole diameter by machine side 25.7mm. Wall thickness 5.5mm. M24 for tractor up to 42kw. M27 for tractors up to 42kw cat 1. M27 for tractors up to 75kw cat 2. M30 for tractors up to 75kw. M36 for tractors up to 135kw.