Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.
Euclid · Hardware & Fasteners
E5988R
In stock · ships from Knoxville
This right-hand inner cap nut is used on heavy-duty truck and trailer dual wheel assemblies with aluminum wheels.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 1 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Intended for dual aluminum wheel applications with maximum thread engagement. Verify stud sizes and right-hand thread orientation before ordering.
Part data verified against 5 catalog sources
Different year, make, or config? Get a confirmation against your truck in under a minute.
It threads onto the inner stud of the hub (3/4"-16 thread) and provides an external 1-1/8"-16 stud for the outer wheel nut, allowing two wheels to be securely stacked. The nut is Grade 8 through‑hardened steel for strength and is typically replaced when threads are damaged, corroded, or during routine wheel‑end maintenance.
Part Number: E5988R
R/H INNER NUT DUAL AL.
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
