JLG Parts Hex Head Cap Screw for use on Skytrak Telehandlers Machines. This bolt attaches the Drive/Input Shaft to the Isolation Coupler on the Engine of the Machine. These are Grade 8 with a length of 1.25" and a thread pitch of .438-20. Model Use: 6036, 6042, 8042, 10042, 10054, 12054. Please ensure proper model and serial break before parts purchase.