This tall air cleaner nut has a 5/16"-18 thread and a built-in O-ring for a positive seal, machined from aluminum and finished in black anodize.
Spec Sheet: Allstar Spec Sheet
Compatibility
Universal fit. Sized for 5/16"-18 thread air cleaner studs; not matched to a particular make or model.
FAQ
What thread size is this nut?
This nut has a 5/16"-18 thread.
Is this the short or tall version?
This is the tall version.
What is this nut made of?
This nut is machined from aluminum and finished in black anodize.

