Home / Lawn & Garden / Parts / Line Trimmer Hex Bolt 668-4638 Line Trimmer Hex Bolt 668-4638Price Not Available Price may not be up-to-date. Out of Stock View Product Part Number: 668-4638 Brand: HITACHI POWER TOOLS Seller: Sears PartsDirect Categories: Lawn & Garden, Parts Possible Matches$20.95Hitachi 6684620 668-4620 Pump Filter Body for CG24EASPSL (4-Pack) Description This hex bolt (part number 668-4638) is for line trimmers. Follow appropriate safety practices when installing hex bolt 668-4638.