These aluminium nuts are designed to secure AN bulkhead in place. Bulkheads are used to pass hoses through bulkheads, firewalls, fuel cells, floor panels and any other bracket or solid material. These half jam nuts are the same bulkhead nuts featured in our full flow range of bulkheads but can be used with any bulkhead in our range. The extra thin nut provides great clearance when using with thicker panels or for a sleek professional look where the nuts do not stand out. All nuts are sold individually in a range of sizes and colours.