I may get scalped for putting this up here but for all the guys looking to source 18mm stuff for spring hanger stuff I found this
May only be 8.8 grade but they are greasable as well...who knows how they'll hold up
http://www.marlincrawler.com/hardware-tools/hardware/greasable-shackle-bolts
May only be 8.8 grade but they are greasable as well...who knows how they'll hold up
http://www.marlincrawler.com/hardware-tools/hardware/greasable-shackle-bolts